Distinctive Supercapacitive Properties of Copper and Copper Oxide Nanocrystals Sharing a Similar Colloidal Synthetic Route

5 years ago

Distinctive Supercapacitive Properties of Copper and Copper Oxide Nanocrystals Sharing a Similar Colloidal Synthetic Route

Weidong He, James H. Dickerson, Xian Jian, Tianyu Lei, Weiqiang Lv, Min Deng, Songhao Wu, Mingzhen Liu, Yidong Han, Gaolong Zhu, Jie Xiong

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. CuO grown in situ on nickel foam exhibits a specific capacitance of 1355 F g−1 at 2 A g−1 with 70% capacity retention and ≈100% Columbic efficiency after 7000 cycles. The performance is well above those of Cu and Cu2O and is superior to other known CuO electrodes.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/aenm.201700105