Surface chemical functionality of carbon dots: influence on the structure and energy storage performance of the layered double hydroxide |
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Authors: | Huimin Li Yingjun Xie Yingliang Liu Yong Xiao Hang Hu Yeru Liang Mingtao Zheng |
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Affiliation: | Key Laboratory for Biobased Materials and Energy of Ministry of Education/Guangdong Provincial Engineering Technology Research Center for Optical Agriculture, College of Materials and Energy, South China Agricultural University, Guangzhou 510642 China.; Maoming Branch, Guangdong Laboratory for Modern Agriculture, Maoming 525000 China |
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Abstract: | As a kind of zero-dimensional material, carbon dots (CDs) have become a kind of promising novel material due to their incomparable unique physical and chemical properties. Despite the optical properties of CDs being widely studied, their surface chemical functions are rarely reported. Here we propose an interesting insight into the important role of surface chemical properties of CDs in adjusting the structure of the layered double hydroxide (LDH) and its energy storage performance. It was demonstrated that CDs with positive charge (p-CDs) not only reduce the size of the flower-like LDH through affecting the growth of LDH sheets, but also act as a structure stabilizer. After calcination, the layered double oxide (LDO) maintained the morphology of the LDH and prevented the stacking of layers. And the superiority of the composite in lithium-ion batteries (LIBs) was demonstrated. When used as an anode of LIBs, composites possess outstanding specific capacity, cycle stability and rate performance. It presents the discharge capacity of 1182 mA h g−1 and capacity retention of 94% at the current density of 100 mA g−1 after 100 cycles. Our work demonstrates the important chemical functions of CDs and expands their future applications.As a kind of zero-dimensional material, carbon dots (CDs) have become a kind of promising novel material due to their incomparable unique physical and chemical properties. |
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