期刊
JOURNAL OF POWER SOURCES
卷 317, 期 -, 页码 1-9出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.03.085
关键词
Layered NixCo2x(OH)(6x); Dual 3D Ni framework; Supercapacitor; OER electrocatalyst
资金
- Natural Science Foundation of China [21306030, 21576056, 21576057]
- Natural Science Foundations of Guangdong Province [2014A030313520, 2015A030313503]
- Program Foundation of the second batch of innovation teams of Guangzhou Bureau of Education [13C04]
- Scientific Research Project of Guangzhou Municipal Colleges and Universities [1201410618]
To achieve high electrochemical performance in energy storage and conversion devices, transition metal hydroxides electrode materials need enhancing their intrinsic poor conductivity and fully utilizing their unexploited active sites. Accordingly, a simple and effective strategy is developed to synthesize layered NixCo2x(OH)(6x) nanosheets using dual three-dimensional Ni as structural and conductive support system. Owing to highly electrical conductivity, rich of interconnected ion/electron transport pathways, and robust structure stability, NixCo2x(OH)(6x)@Ni electrode exhibits remarkably high specific capacitance, excellent rate capability, and superior cycle stability. Moreover, the asymmetric supercapacitor assembled by NixCo2x(OH)(6x)@Ni and activated carbon/carbon nanotube achieves a large working voltage window of 1.5 V, a high energy density ( approximate to 44.2 Wh kg(-1) at a power density of 750 W kg(-1)) and outstanding long-term cycle ability (remaining 100% of the initial C-sp after 5000 cycles). Furthermore, the NixCo2x(OH)(6x)@Ni as an oxygen evolution reaction electrocatalyst shows small onset overpotential (263 mV), low Tafel slope (78 mV dec(-1)), large anodic current density of 30 mA cm(-2) at a low over potential of 336 mV and prominent electrochemical durability. (C) 2016 Elsevier B.V. All rights reserved.
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