Ni(OH)2/NiO/Ni composite nanotube arrays for high-performance supercapacitors

作者：Dai, Xin; Chen, Dan; Fan, Huiqing; Zhong, Yuan; Chang, Ling; Shao, Haibo; Wang, Jianming^*; Zhang, Jianqing; Cao, Chu-nan

来源：Electrochimica Acta, 2015, 154: 128-135.

DOI：10.1016/j.electacta.2014.12.066

• Nickel hydroxide
• Nickel oxide
• Nanotube
• Supercapacitor
• Dealloying

Transition metal oxide nanostructures are one of current investigation focuses for energy storage applications. We herein report a novel template-free electrochemical approach to fabricate Ni(OH)(2)/NiO/Ni composite nanotube array films on the nickel substrate. The inner diameter of the composite nanotubes can be effectively tuned by tailoring the concentration of Cu2+ in the precursor solutions. The as-constructed composite nanotube array film electrode, which is fabricated by the electrochemical approach using the 0.1 M Cu2+ containing precursor solution, delivers the specific capacitance of 1070 F g (1) at the current density of 15 A g (1) after 10,000 charge-discharge cycles. The specific capacitance of the cycled electrode at 150 A g (1) is as much as 79.3% of that at 15 Ag (1), demonstrating its excellent rate capability. The cycled electrode presents a high specific energy density of 31.4 Wh kg (1) at a larger power density of 11.1 kW kg (1). The excellent pseudocapacitive performance of the Ni(OH)(2)/NiO/Ni composite nanotube array electrodes can be attributed to their unique structure characteristics.

• 出版日期2015-2-1
• 单位浙江大学