Distinctive Supercapacitive Properties of Copper and Copper Oxide Nanocrystals Sharing a Similar Colloidal Synthetic Route |
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| Authors: | Songhao Wu Weiqiang Lv Tianyu Lei Yidong Han Xian Jian Min Deng Gaolong Zhu Mingzhen Liu Jie Xiong James H. Dickerson Weidong He |
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| Affiliation: | 1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan Province, P. R. China;2. Department of Physics, Brown University, Providence, RI, USA |
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| Abstract: | CuO and Cu2O are non‐noble transition metal oxide supercapacitive materials with high theoretical specific capacitances above 1800 F g?1. In this work, by adjusting organic additives of a colloidal system, Cu, Cu2O, and CuO are grown in situ on nickel foam. CuO exhibits a specific capacitance of 1355 F g?1 at 2 A g?1 in 3 m KOH, a value well above those of Cu and Cu2O (<500 F g?1), and is superior to other known CuO electrodes. The CuO electrode exhibits 70% of its initial capacity, and the Columbic efficiency remains ≈100% after 7000 cycles at 4 A g?1. Cu2O exhibits the worst electrochemical performance, mainly due to the inactive barrier layer forming on the surface. This work provides an efficient synthetic platform for both comparable supercapacitive studies and cost‐effective electrochemical energy storage applications. |
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| Keywords: | colloidal synthesis CuO Cu2O energy capacity supercapacitors |
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