Boron Element Nanowires Electrode for Supercapacitors |
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| Authors: | Qi Xue Haibo Gan Yan Huang Minshen Zhu Zengxia Pei Hongfei Li Shaozhi Deng Fei Liu Chunyi Zhi |
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| Institution: | 1. Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong, China;2. State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat‐sen University, Guangzhou, P. R. China;3. Shenzhen Research Institute, City University of Hong Kong, Shenzhen, China |
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| Abstract: | The pursuit of new categories of active materials as electrodes of supercapacitors remains a great challenge. Herein, for the first time, elemental boron as a superior electrode material of supercapacitors is reported, which exhibits significantly high capacitances and excellent rate performance in all alkaline, neutral, and acidic electrolytes. Notably, boron nanowire‐carbon fiber cloth (BNWs‐CFC) electrodes achieve a capacitance up to 42.8 mF cm?2 at a scan rate of 5 mV s?1 and 60.2 mF cm?2 at a current density of 0.2 mA cm?2 in the acidic electrolyte. Moreover, in all these three kinds of electrolytes, BNWs‐CFC electrodes demonstrate a decent cycling stability with >80% capacitance retention after 8000 charging/discharging cycles. The Dominating energy storage mechanism of BNWs in the different electrolytes is analyzed by looking into the kinetics of the electrochemical process. Subsequently, the BNWs‐CFC electrode is used to fabricate a flexible solid‐state supercapacitor, which reveals a specific capacitance up to 22.73 mF cm?2 and good mechanical performance after 1000 bending cycles. This study opens a new avenue to explore elemental boron‐based new nanomaterials for the application of energy storage with superior electrochemical performance. |
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| Keywords: | boron nanowires energy storage flexible supercapacitors supercapacitors |
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