Extraordinary Supercapacitor Performance of a Multicomponent and Mixed‐Valence Oxyhydroxide |
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| Authors: | Dr Jianli Kang Akihiko Hirata Luyang Chen Shengli Zhu Takeshi Fujita Prof Mingwei Chen |
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| Institution: | 1. School of Materials Science and Engineering and State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387 (China);2. WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980‐8577 (Japan);3. CREST (Japan) Science and Technology Agency (JST), Saitama 332‐0012 (Japan);4. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030 (China) |
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| Abstract: | We report a novel multicomponent mixed‐valence oxyhydroxide‐based electrode synthesized by electrochemical polarization of a de‐alloyed nanoporous NiCuMn alloy. The multicomponent oxyhydroxide has a high specific capacitance larger than 627 F cm?3 (1097±95 F g?1) at a current density of 0.25 A cm?3, originating from multiple redox reactions. More importantly, the oxyhydroxide electrode possesses an extraordinarily wide working‐potential window of 1.8 V in an aqueous electrolyte, which far exceeds the theoretically stable window of water. The realization of both high specific capacitance and high working‐potential windows gives rise to a high energy density, 51 mWh cm?3, of the multicomponent oxyhydroxide‐based supercapacitor for high‐energy and high‐power applications. |
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| Keywords: | multicomponent oxides nanoporous metals oxyhydroxides polarization supercapacitors |
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