期刊
ELECTROCHIMICA ACTA
卷 161, 期 -, 页码 279-289出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.02.095
关键词
Nickel cobalt hydroxide; Nanoflower; Hydrothermal synthesis; Template-free synthesis; Supercapacitor
资金
- National Natural Science Foundation of China [21406191]
- Natural Science Foundation of Hebei Province [B2013203199, B2012203005]
- Specialized Research Fund for the Doctoral Program of Higher Education [20131333120011]
- Key Technology Research and Development Program of Qinhuangdao [2012021A072, 201401A042, 201401A019]
- Youth Independent Project of Yanshan University [13LGA015]
- State Key Laboratory of Advanced Technology for Material Synthesis and Processing (Wuhan University of Technology) [2013-KF-11]
In this work, various nickel cobalt double hydroxide nanoflowers with different Ni/Co ratios (denoted as NixCo(1-x)(OH)(2)), assembled by filmy nanoflakes, are prepared via a facile template-free hydrothermal process. The sizes of these nanoflowers are easily tuned by the Ni/Co ratio in the precursors. The formation mechanism of flower-like nickel cobalt hydroxide, based on the synergistic effect of ammonia complexation, Ni/Co ratios, precipitators and solvents in the template-free hydrothermal system, is demonstrated in detail. As the battery materials, the as prepared flower-like nickel cobalt double hydroxides exhibit excellent specific capacities and high rate performance. Ni0.28Co0.72(OH)(2) displays the highest capacity of 206.7 mA hg(-1) at 1 mV s(-1) and 174.3 mA hg(-1) at 1 Ag-1, respectively. The capacity retention of Ni0.28Co0.72(OH)(2) is 59.1% (from 206.7 to 122.2 mA hg(-1)) at the potential scan rate from 1 to 25 mV s(-1). Due to the high rate performance corresponding to high power energy, Ni0.28Co0.72(OH)(2) is used as positive material to assemble the hybrid device (asymmetric supercapacitor) with activated carbon as negative material. The as-prepared asymmetric supercapacitor exhibits 19.4 Wh kg(-1) at 80.5 W kg(-1), and even 20.6 Wh kg(-1) at 3.93 kW kg(-1). (C) 2015 Elsevier Ltd. All rights reserved.
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