Hydrothermal Transformation of Dried Grass into Graphitic Carbon‐Based High Performance Electrocatalyst for Oxygen Reduction Reaction |
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| Authors: | Haimin Zhang Yun Wang Dan Wang Yibing Li Xiaolu Liu Porun Liu Huagui Yang Taicheng An Zhiyong Tang Huijun Zhao |
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| Affiliation: | 1. Centre for Clean Environment and Energy, Griffith University, , QLD, 4222 Australia;2. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, , Beijing, 100190 China;3. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, , Guangzhou, 510640 China;4. Laboratory for Nanomaterials, National Center for Nanoscience and Technology, , Beijing, 100190 China;5. Centre for Environmental and Energy Nanomaterials, Institutes of Solid State Physics, Chinese Academy of Sciences, , Hefei, 230031 China |
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| Abstract: | In this work, we present a low cost and environmentally benign hydrothermal method using dried grass as the sole starting material without any synthetic chemicals to directly produce high quality nitrogen‐doped carbon nanodot/nanosheet aggregates (N‐CNAs), achieving a high yield of 25.2%. The fabricated N‐CNAs possess an N/C atomic ratio of 3.41%, consist of three typed of doped N at a ratio of 2.6 (pyridinic):1.7 (pyrrolic):1 (graphitic). The experimental results reveal that for oxygen reduction reaction (ORR), the performance of N‐CNAs, in terms of electrocatalytic activity, stability and resistance to crossover effects, is better or comparable to the commercial Pt/C electrocatalyst. The theoretical studies further indicate that the doped pyridinic‐N plays a key role for N‐CNAs' excellent four‐electron ORR electrocatalytic activity. |
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| Keywords: | monkey grass carbon‐based electrocatalyst nitrogen doping oxygen reduction reaction nanodot/nanosheet aggregates |
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