共查询到20条相似文献,搜索用时 15 毫秒
1.
In this work, we reported a new method to fabricate flexible carbon-based supercapacitor electrodes derived from a commercialized and low-cost lignin. The fabrication process skips traditional stabilization/carbonization/activation for lignin-based carbon production. Also, the process reported here was green and facile, with minimum solvent use and no pretreatment required. Characterization of the lignin showed that it has common properties among all types of lignin. The lignin was impregnated on carbon cloth and then subjected to direct laser writing to form the desired electrodes (LLC). The results showed that lignin was successfully bonded to carbon cloth. The LLC has a good porous carbon structure with a high IG/ID ratio of 1.39, and a small interlayer spacing d002 of 0.3436 nm, which are superior to most of the reported lignin-based carbons. Although not optimized, the fabricated LLC showed good supercapacitance behavior with an areal capacitance of 157.3 mF cm−2 at 0.1 mA cm−2. In addition, the superior flexibility of LLC makes it a promising electrode that can be used more widely in portable devices. Conceptually, this method can be generalized to all types of lignin and can define intriguing new research interests towards lignin applications.Lignin was directly grown on carbon cloth via laser writing to form 3D porous graphene for flexible supercapacitors. 相似文献
2.
Mai Li Kailan Zhu Zheyi Meng Ruihua Hu Jiale Wang Chunrui Wang Paul K. Chu 《RSC advances》2021,11(57):35726
Recent research and development of energy storage devices has focused on new electrode materials because of the critical effects on the electrochemical properties of supercapacitors. In particular, MnO2 and Fe2O3 have drawn extensive attention because of their low cost, high theoretical specific capacity, environmental friendliness, and natural abundance. In this study, MnO2 ultrathin nanosheet arrays and Fe2O3 nanoparticles are fabricated on TiN nanowires to produce binder-free core–shell positive and negative electrodes for a flexible and ultra-fast hybrid supercapacitor. The MnO2/TiN/CC electrode shows larger pseudocapacitance contributions than MnO2/CC. For example, at a scanning rate of 2 mV s−1, the pseudocapacitance contribution of MnO2/TiN/CC is 87.81% which is nearly 25% bigger than that of MnO2/CC (71.26%). The supercapacitor can withstand a high scanning rate of 5000 mV s−1 in the 2 V window and exhibits a maximum energy density of 71.19 W h kg−1 at a power density of 499.79 W kg−1. Even at 5999.99 W kg−1, it still shows an energy density of 31.3 W h kg−1 and after 10 000 cycles, the device retains 81.16% of the initial specific capacitance. The activation mechanism is explored and explained. MnO2 ultrathin nanosheet arrays and Fe2O3 nanoparticles are fabricated on carbon based TiN nanowires to produce binder-free and core–shell positive and negative electrodes for a flexible and ultra-fast hybrid supercapacitor. 相似文献
3.
Jinlei Xie Yefeng Yang Geng Li Hanchun Xia Peijia Wang Peiheng Sun Xiaolong Li Haoran Cai Jie Xiong 《RSC advances》2019,9(6):3041
To obtain high-performance hybrid supercapacitors (HSCs), a new class of battery-type electrode materials with hierarchical core/shell structure, high conductivity and rich porosity are needed. Herein, we propose a facile one-step sulfuration approach to achieve the fabrication of hierarchical NiCo2S4@NiCo2S4 hybrid nanotube/nanosheet arrays (NTSAs) on carbon cloth, by taking hydrothermally grown Ni–Co precursor@Ni–Co precursor nanowire/nanosheet arrays (NWSAs) as the starting templates. The optimized electrode of NiCo2S4@NiCo2S4 hybrid NTSAs demonstrates an enhanced areal capacity of 245 μA h cm−2 at 2 mA cm−2 with outstanding rate capability (73% from 2 to 20 mA cm−2) and cycling stability (86% at 10 mA cm−2 over 3000 cycles). In addition, flexible solid-state HSC devices are assembled by using NiCo2S4@NiCo2S4 hybrid NTSAs and activated carbon as the positive and negative electrodes, respectively, which manifest a maximum volumetric energy density of 1.03 mW h cm−3 at a power density of 11.4 mW cm−3, with excellent cycling stability. Our work indicates the feasibility of designing and fabricating core/shell structured metal sulfides through such a facile one-step sulfuration process and the great potential of these materials as advanced electrodes for high-performance HSC devices.One-step sulfuration synthesis of NiCo2S4@NiCo2S4 core–shell arrays on carbon cloth. 相似文献
4.
Carbon nanotubes (CNTs) have been considered as promising electrode materials for energy storage devices, especially flexible electronics owing to their excellent electrical, physicochemical and mechanical properties. However, the severe aggregation between CNTs significantly reduces the electrochemically active surface areas and thus degrades the electrochemical properties. In this study, we demonstrate a facile layer-by-layer strategy toward preparing a CNT/hollow carbon nanocage (HCNC) hybrid film. Through electrochemically removing the impurities in CNT films and optimizing the concentrations of HCNC, the hybrid film exhibits a high specific capacitance of 183.7 F g−1 at 10 mV s−1 and good cycling stability of 85% retention after 5000 cycles at 1 A g−1. Our study provides potential scale-up synthesis of free-standing CNT electrode materials for high-performance supercapacitors.A carbon nanotube-hollow carbon nanocage hybrid film is fabricated via a facile layer-by-layer strategy. The in situ addition of hollow carbon nanocages to the film is beneficial for preventing CNT stacking and thus promoting electrolyte transport. 相似文献
5.
Rational design of electrode materials plays a significant role in potential applications such as energy storage and conversion. In this work, CoNi2S4/Ni3S2 nanowires grown on Ni foam were synthesized through a facile hydrothermal approach, revealing a large capacitance of 997.2 F g−1 and cycling stability with 80.3% capacitance retention after 5000 cycles. The device was prepared using CoNi2S4/Ni3S2//AC as the positive electrode and active carbon as the negative electrode, and delivered an energy density of 0.4 mW h cm−3 at a power density of 3.99 mW cm−3 and an excellent cycle life with 79.2% capacitance retention after 10 000 cycles. In addition, the hybrid CoNi2S4/Ni3S2 nanowires demonstrate excellent OER performance with low overpotential of 360 mV at 30 mA cm−2 and overpotential of 173.8 mV at −10 mA cm−2 for the HER, a cell voltage of 1.43 V, and excellent cycle stability.Rational design of electrode materials plays a significant role in potential applications such as energy storage and conversion. 相似文献
6.
Lili Zhang Tingting Zhang Kaiqing Dai Liqing Zhao Qinghe Wei Bing Zhang Xu Xiang 《RSC advances》2020,10(49):29326
The development of bifunctional electrocatalysts based on highly efficient non-noble metals is pivotal for overall water splitting. Here, a composite electrode of Co3O4@CoWP is synthesized, where an ultrathin layer composed of Co3O4 nanoparticles is grown on CoWP nanowires supported on a carbon cloth (CC). The Co3O4@CoWP/CC electrode exhibits excellent electrocatalytic activity and improved kinetics towards both the oxygen and hydrogen evolution reactions (OER and HER). The Co3O4@CoWP/CC electrode achieves a current density of 10 mA cm−2 at a low overpotential of 269 mV for the OER and −10 mA cm−2 at 118 mV for the HER in 1.0 M KOH solution. The voltage applied to a two-electrode water electrolyzer for overall water splitting, while employing the Co3O4@CoWP/CC electrode as both an anode and a cathode, in order to reach a current density of 10 mA cm−2, is 1.61 V, which is better than that for the majority of reported non-noble electrocatalysts. Moreover, the Co3O4@CoWP/CC electrode exhibits good stability over 24 h with slight attenuation. The electrode benefits from the enhanced adsorption of oxygen intermediates on Co3O4 during the OER, the increased ability for water dissociation and the optimized H adsorption/desorption ability of CoWP nanowires during the HER. This study provides a feasible approach for cost-effective and high-performance non-noble metal bifunctional catalysts for overall water electrolysis.A hierarchical 3D self-supporting CoWP nanowire array shelled with an ultrathin Co3O4 nanolayer on carbon cloth (Co3O4@CoWP/CC) exhibits superior overall water electrolysis capability. 相似文献
7.
Akerke Bereketova Muthuchamy Nallal Mohammad Yusuf Sanha Jang Karthick Selvam Kang Hyun Park 《RSC advances》2021,11(27):16823
In this study, we constructed a highly effective, low-cost, non-noble-metal-based electrocatalyst to replace Pt catalysts, with a CoS@SNC catalyst being successfully synthesized. The obtained nanocatalyst was characterized via scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, powder X-ray diffraction studies, and X-ray photoelectron spectroscopy. Herein, an initially prepared N-containing Co MOF formed flower-like particles, which were obtained via a solvothermal method; further it was used for a sulfuration process as a template to achieve an S,N (heteroatom)-doped carbon electrocatalyst with embedded CoS (CoS@SNC). The synthesized flower-like CoS@SNC electrocatalyst derived from a novel MOF showed a uniform distribution of Co, S, N, and C at the molecular level in the MOF and it was rich in active sites, facilitating enhanced electrocatalytic performance. During the HER and OER in 0.1 M KOH solution, to reach a current density of 10 mA cm−2, lower overpotentials of −65 mV and 265 mV, respectively, were required and Tafel slopes of 47 mV dec−1 and 59.8 mV dec−1, respectively, were seen. In addition, due to a synergistic effect between CoS and the S,N-doped carbon matrix, long-term durability and stability were obtained. This facile synthetic strategy, which is also environmentally favorable, produces a promising bifunctional electrocatalyst.In this study, we constructed a highly effective, low-cost, non-noble-metal-based electrocatalyst to replace Pt catalysts, with a CoS@SNC catalyst being successfully synthesized. 相似文献
8.
Designing electrode structures with high activity is very significant for energy conversion systems. However, single electrode materials often exhibit poor electronic transportation. To address this issue, we prepared P-Fe2O3 nanowire arrays through a convenient hydrothermal and phosphation method. The as-obtained electrode materials exhibited excellent electrocatalytic performance, which could be attributed to the P element decoration improving the reaction active sites. The as-obtained P-Fe2O3-0.45 nanowire arrays exhibited excellent OER activity with a low overpotential of 270 mV at 10 mA cm−2 (72.1 mV dec−1), excellent HER performance with a low overpotential of 126.4 mV at −10 mA cm−2, a small Tafel slope of 72.5 mV dec−1 and long durability. At the same time, the P-Fe2O3-0.45 nanowire arrays possessed a low cell voltage of 1.56 V at 10 mA cm−2.Designing electrode structures with high activity is very significant for energy conversion systems. 相似文献
9.
Copper nanowire (CuNW) based flexible transparent electrodes have been extensively investigated due to their outstanding performances and low price. However, commonly used methods for processing CuNW transparent electrodes such as thermal annealing and photonic sintering inevitably damage the flexible substrates leading to low transmittance. Herein, a surface coating layer was demonstrated to protect the heat-sensitive polyethylene terephthalate (PET) polymer from being destroyed by the instantaneous high temperature during the photonic sintering process. The stable ceramic surface coating layer avoided the direct exposure of PET to intense light, further reduced the heat releasing to the bottom part of the PET, protecting the flexible PET base from destruction and ensuring high transparency for the CuNW transparent electrodes. A CuNW transparent electrode on surface coated PET (C-PET) substrates with a sheet resistance of 33 Ohm sq−1 and high transmittance of 82% has been successfully fabricated by the photonic sintering method using light intensity of 557 mJ cm−2 within several seconds in ambient conditions. The surface coating layers open a novel method to optimize the rapid photonic sintering technique for processing metal nanomaterials on heat-sensitive substrates.The optoelectrical property of CuNW transparent electrodes on C-PET substrates was superior to that on N-PET because the surface coatings protected the destruction of PET polymer by the high-energy light during the photonic sintering process. 相似文献
10.
Chuan Jing Qiang Zhang Xiaoying Liu Yuxiang Chen Xin Wang Luhao Xia Hao Zeng Decai Wang Wenzheng Zhang Fan Dong 《RSC advances》2019,9(17):9604
Hydrotalcite is an abundant mineral in nature and can be cost-effectively prepared in the laboratory, but there is almost no discussion about its application in the field of supercapacitors. Herein, hydrotalcite-like ternary NiMgAl LDHs with unique ultrathin nanosheets were designed and fabricated by a facile hydrothermal method. The preparation conditions, such as Ni/Mg molar ratio and hydrothermal reaction time, are evaluated carefully. The physical and chemical properties were also evaluated by various characterization techniques such as XRD, FIB/SEM, EDS, TEM, XPS and BET. The electrochemical behaviors of present samples were determined by CV, CC and cycling tests in a three-electrode system. As a battery-type electrode material in a supercapacitor, owing to the advantage of its unique layered structure, high specific area and obvious redox states, the fabricated Ni2MgAl LDH-24 h nanosheets present an outstanding specific capacitance of 219.2 mA h g−1 at a current density of 1 A g−1 and superior cycling stability with 86.1% capacitance retention over 5000 cycles. Although 45.7% capacitance retention is not satisfactory when the current density increases from 1 to 3 A g−1 due to the NiMgAl LDH''s low effective mass and conductivity, it is still a successful case for hydrotalcite application in supercapacitors by doping with Ni2+ to achieve high electrochemical performance. The design and fabrication strategy can facilitate the application of the natural hydrotalcite mineral in the energy storage field.Hydrotalcite is an abundant mineral in nature and can be cost-effectively prepared in the laboratory, but there is almost no discussion about its application in the field of supercapacitors. 相似文献
11.
Metal–organic framework-derived materials are now considered potential next-generation electrode materials for supercapacitors. In this present investigation, Co3O4@MnO2 nanosheets are synthesized using ZIF-67, which is used as a sacrificial template through a facile hydrothermal method. The unique vertically grown nanosheets provide an effective pathway for rapidly transporting electrons and ions. As a result, the ZIF-67 derived Co3O4@MnO2-3 electrode material shows a high specific capacitance of 768 C g−1 at 1 A g−1 current density with outstanding cycling stability (86% retention after 5000 cycles) and the porous structure of the material has a good BET surface area of 160.8 m2 g−1. As a hybrid supercapacitor, Co3O4@MnO2-3//activated carbon exhibits a high specific capacitance (82.9 C g−1) and long cycle life (85.5% retention after 5000 cycles). Moreover, a high energy density of 60.17 W h kg−1 and power density of 2674.37 W kg−1 has been achieved. This attractive performance reveals that Co3O4@MnO2 nanosheets could find potential applications as an electrode material for high-performance hybrid supercapacitors.Metal–organic framework-derived materials are now considered potential next-generation electrode materials for supercapacitors. 相似文献
12.
With the rapid propagation of flexible electronic devices, flexible lithium-ion batteries (FLIBs) are emerging as the most promising energy supplier among all of the energy storage devices owing to their high energy and power densities with good cycling stability. As a key component of FLIBs, to date, researchers have tried to develop newly designed high-performance electrochemically and mechanically stable pliable electrodes. To synthesize better quality flexible electrodes, based on high conductivity and mechanical strength of carbonaceous materials and metals, several research studies have been conducted. Despite both materials-based electrodes demonstrating excellent electrochemical and mechanical performances in the laboratory experimental process, they cannot meet the expected demands of stable flexible electrodes with high energy density. After all, various significant issues associated with them need to be overcome, for instance, poor electrochemical performance, the rapid decay of the electrode architecture during deformation, and complicated as well as costly production processes thus limiting their expansive applications. Herein, the recent progression in the exploration of carbonaceous materials and metals based flexible electrode materials are summarized and discussed, with special focus on determining their relative electrochemical performance and structural stability based on recent advancement. Major factors for the future advancement of FLIBs in this field are also discussed.With the rapid propagation of flexible electronic devices, flexible lithium-ion batteries are emerging as the most promising energy supplier among all of the energy storage devices due to high energy and power densities with good cycling stability. 相似文献
13.
Preeti Waribam Kanticha Jaiyen Chanatip Samart Makoto Ogawa Guoqing Guan Suwadee Kongparakul 《RSC advances》2021,11(16):9327
A cross-linked sulfonated polyether ether ketone (C-SPEEK) was incorporated with MXene/potassium titanate nanowire (MKT-NW) as a filler and applied as a proton exchange membrane for photocatalytic water splitting. The prepared hybrid composite PEM had proton conductivity of 0.0097 S cm−1 at room temperature with an ion exchange capacity of 1.88 meq g−1. The hybrid composite proton exchange membrane is a reactive membrane which was able to generate hydrogen gas under UV light irradiation. The efficiency of hydrogen gas production was 0.185066 μmol within 5 h for 12% wt of MKT-NW loading. The results indicated that the MKT-NW/C-SPEEK membrane is a promising candidate for ion exchange with hydrogen gas evolution in photocatalytic water splitting and could be applied as a renewable source of energy to use in various fields of applications.A cross-linked sulfonated polyether ether ketone (C-SPEEK) was incorporated with MXene/potassium titanate nanowire (MKT-NW) as a filler and applied as a proton exchange membrane for photocatalytic water splitting. 相似文献
14.
Xiaojun Liu Junrui Yu Honghong Song Pengfei Song Rongming Wang Yubing Xiong 《RSC advances》2019,9(9):5189
Bovine serum albumin (BSA) was complexed with a hydrophobic ionic liquid polymer (PIL) via electrostatic interaction to fabricate a carbon precursor. Then, a novel nitrogen (N) and sulfur (S) codoped micro-/mesoporous carbon (NSPC) was obtained via direct carbonization of the interpolyelectrolyte BSA@PIL complex. The newly developed NSPC materials exhibited excellent HER/OER electrocatalytic activity and stability, as well as outstanding capacitance performance. Remarkably, NSPC pyrolyzed at 1000 degrees (NSPC-1000) presented an overpotential as low as 172 mV vs. RHE (without iR correction) to achieve a current density of 10 mA cm−2 and a Tafel slope of 44.3 mV dec−1 in 0.5 M H2SO4 for HER, as well as a low overpotential of 460 mV vs. RHE in 0.1 M KOH for OER. Furthermore, NSPC-1000 offers a specific capacitance as high as 495 F g−1 at a current density of 0.1 A g−1. Such excellent performance of NSPC in electrocatalytic water splitting and supercapacitors originates from the synergistic effects of its N/S-codoping and micro-/mesoporous hierarchical architecture. Our facile protocol through combining biomacromolecules and synthetic polymers offers a new strategy in the development of effective, readily scalable and metal-free heteroatom-doped carbon materials for energy-related applications.Nitrogen and sulfur codoped porous carbon (NSPC) is fabricated via pyrolyzing BSA and poly(ionic liquid) complex. NSPC is demonstrated to be excellent metal-free electrocatalyst for water splitting and electrode material for supercapacitor. 相似文献
15.
Flexible energy storage devices have received great interest due to the increasing demand for wearable and flexible electronic devices with high-power energy sources. Herein, a novel hybrid flexible hexagonal boron nitride integrated graphene paper (BN/GrP) is fabricated from 2D hexagonal boron nitride (h-BN) nanosheets integrated with graphene sheets dispersion via a simple vacuum filtration method. FE-SEM indicated that layered graphene nanosheets tightly confined with h-BN nanosheets. Further, the Raman spectroscopy confirmed successful integration of BN with graphene. As-prepared BN/GrP free-standing flexible conductive paper showed high electrical conductivity of 5.36 × 104 S m−1 with the sheet resistance of 8.87 Ω sq−1. However, after 1000 continuous bending cycles, the BN/GrP sheet resistance increased just about 8.7% which indicated good flexibility of the paper. Furthermore, as-prepared BN/GrP showed excellent specific capacitance of 321.95 F g−1 at current density of 0.5 A g−1. In addition, the power and energy densities were obtained as 3588.3 W kg−1, and 44.7 W h kg−1, respectively. The stability of the prepared flexible electrode was tested in galvanostatic charge/discharge cycles, where the results showed the 96.3% retention even after 6000 cycles. These results exhibited that the proposed BN/GrP may be useful to prepare flexible energy-storage systems.As-prepared BN/GrP free-standing flexible conductive paper showed high electrical conductivity of 5.36 × 104 S m−1 with the sheet resistance of 8.87 Ω sq−1. Furthermore, BN/GrP showed excellent specific capacitance of 321.95 F g−1 at current density of 0.5 A g−1. In addition, the power and energy densities were obtained as 3588.3 W kg−1, and 44.7 W h kg−1. 相似文献
16.
Junxian Li Jianwei Zhao Lirong Qin Qitao Zhang Xiaolan Tang Yingying Xu 《RSC advances》2020,10(38):22606
Hierarchical Co(OH)2@NiMoS4 nanocomposites were successfully prepared on a carbon cloth by using a simple two-step hydrothermal method coupled with a room-temperature vulcanization method. The resulting nanocomposites were composed of large-scale uniform Co(OH)2 nanowires fully covered with ultrathin vertical NiMoS4 nanoflakes. Because of the synergetic effect between Co(OH)2 and NiMoS4, the nanocomposites exhibited good electrochemical performance as a supercapacitor electrode. In particular, a specific capacity of 2229 F g−1 was achieved at a current density of 1 A g−1. In addition, an asymmetrical supercapacitor fabricated using activated carbon as the negative electrode and the as-synthesised nanocomposite as the positive electrode exhibited a maximum energy density of 59.5 W h kg−1 at a power density of 1 kW h kg−1 and excellent cycling stability (100% capacitance retention after 5000 cycles). These results indicate that the hierarchical Co(OH)2@NiMoS4 nanocomposite has great potential for practical application in high-performance energy storage devices.A hierarchical Co(OH)2@NiMoS4 nanocomposite was prepared on the surface of carbon cloth, which exhibited good electrochemical performance as a supercapacitor electrode. 相似文献
17.
Wenbo Liu Zhendong Zhang Deguang Zhang Runwei Wang Zongtao Zhang Shilun Qiu 《RSC advances》2020,10(48):28848
Carbon nitride has become a focus of photocatalytic materials research in recent years, but the low specific surface area, the bad separation efficiency of photocarriers, poor quantum efficiency, terrible photocatalytic activity hinder the development of carbon nitride in the field of photocatalysis. The preparation of carbon nitride nanosheets is one of the effective methods to improve the photocatalytic efficiency of carbon nitride, but the traditional top-down stripping process is time-consuming, complicated and expensive. Here we report a simple, cheap, non-toxic and environmentally friendly bottom-up method to prepare a curled g-C3N4 nanosheet (NS-C3N4), which is performed at low temperature and normal pressure. In the aqueous solution, melamine and cyanuric acid are copolymerized to form a copolymer. Glycerol is inserted between the molecular layers of the prepolymer by thermal diffusion. Finally, high-quality and high-yield curled g-C3N4 nanosheets (NS-C3N4) are obtained by thermal peeling and polycondensation. The NS-C3N4 has an highly efficient photocatalytic hydrogen production of 4061.8 μmol h−1 g−1, and the hydrogen evolution activity is 37.5 times that of bulk-C3N4 (B-C3N4). The specific surface area of NS-C3N4 is 60.962 m2 g−1. UV-vis absorption spectra, steady-state and time-resolved photoluminescence, and photoelectrochemical tests were used to study its photocatalytic mechanism.Curled carbon nitride nanosheets with narrow-band gap for ultra-high hydrogen production efficiency. 相似文献
18.
Overall water splitting and CO2 reduction are two very important reactions from the environmental viewpoint. The former produces hydrogen as a clean fuel and the latter decreases the amount of CO2 emissions and thus reduces greenhouse effects. Here, we prepare two types of copper molybdate, CuMoO4 and Cu3Mo2O9, and electrochemically investigate them for water splitting and CO2 reduction. Our findings show that Cu3Mo2O9 is a better electrocatalyst for full water splitting compared to CuMoO4. It provides overpotentials, which are smaller than the overpotentials of CuMoO4 by around 0.14 V at a current density of 1 mA cm−2 and 0.10 V at −0.4 mA cm−2, for water oxidation and hydrogen evolution reactions, respectively. However, CuMoO4 adsorbs CO2 and the reduced intermediates/products more strongly than Cu3Mo2O9. Such different behaviors of these electrocatalysts can be attributed to their different unit cells.Comparing overall water splitting on the surface two types of copper molybdate. 相似文献
19.
Prasit Pattananuwat Rojana Pornprasertsuk Jiaqian Qin Suchittra Prasertkaew 《RSC advances》2021,11(56):35205
The well-designed network structure of synthetic polypyrrole (PPy) nanoparticles embedded on a nitrogen-doped graphene (N-rGO) surface was utilized as a cathode for aqueous zinc-ion hybrid supercapacitors. Owing to the combination of the redox surface of PPy and the two-dimensional network structure of N-rGO, the PPy/N-rGO cathode affords rapid transport channels for Zn2+ ion adsorption/desorption and a faradaic reaction toward the synergistic composite materials. Subsequently, the constructed zinc-ion hybrid supercapacitors with the optimized PPy/N-rGO cathode composites deliver the highest capacity of 145.32 mA h g−1 at 0.1 A g−1 and the maximum energy density of 232.50 W h kg−1 at a power density of 160 W kg−1. Besides this, excellent cycling stability of 85% retention after 10 000 charge–discharge cycles at 7.0 A g−1 was achieved. The high-rate capabilities with long life cycle performance of these novel zinc-ion hybrid supercapacitors could find practical use in a wide range of applications, ranging from next-generation electronic devices to large-scale stationary energy storage.The well-designed network structure of synthetic polypyrrole (PPy) nanoparticles embedded on a nitrogen-doped graphene (N-rGO) surface was utilized as a cathode for aqueous zinc-ion hybrid supercapacitors. 相似文献
20.
Wibawa Hendra Saputera Jenny Rizkiana Winny Wulandari Dwiwahju Sasongko 《RSC advances》2020,10(46):27713
Defect engineering of semiconductor photocatalysts is considered as an evolving strategy to adjust their physiochemical properties and boost photoreactivity of the materials. Here, hydrogenation and UV light pre-treatment of TiO2/SiO2 composite with the ratio of 9 : 1 (9TiO2/1SiO2) were conducted to generate Ti3+ and non-bridging oxygen holes center (NBOHC) defects, respectively. The 9TiO2/1SiO2 composite exhibited much higher photocatalytic water splitting than neat TiO2 and SiO2 as a consequence of the electronic structure effects induced by the defect sites. Electron paramagnetic resonance (EPR) indicated that hydrogenated and UV light pre-treated of 9TiO2/1SiO2 boosted a higher density of Ti3+ and NBOHC defect which could serve to suppress photogenerated electron–hole pair recombination and act as shallow donors to trap photoexcited electron. Overall, both defect sites in 9TiO2/1SiO2 delivered advantageous characteristic relative to neat TiO2 and SiO2 with the finding clearly illustrating the value of defect engineering in enhancing photocatalytic performance.Defect engineering of semiconductor photocatalysts is considered as an evolving strategy to adjust their physiochemical properties and boost photoreactivity of the materials. 相似文献