Journal
ELECTROCHIMICA ACTA
Volume 269, Issue -, Pages 397-404Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.03.026
Keywords
NiCo2S4; Nanorod arrays; Wide potential window; Symmetric supercapacitors
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Funding
- National Natural Science Foundation of China [U1765105]
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NiCo2S4 is generally studied as cathode material for supercapacitors owing to its electrochemical activity in positive voltage region (i.e., 0-0.6 V). Here, we demonstrate it can be used as supercapacitor anodes in potential window of -1 similar to 0 V in 1 M KOH. NiCo2S4 nanorod arrays (NiCoS NRAs) with open top are synthesized through a facile two-step method, delivering high capacitive property of 494 F g(-1) at 5 mA cm(-2) as anode for supercapacitors. By contrary, when tested in positive potential window (0 -0.6 V), the NiCoS NRAs show a maximum specific capacitance of similar to 800 F g(-1) at 12 mA cm(-2). Symmetric supercapacitors (SSCs) which are configurated by both NiCoS NRAs cathode and anode distinctly extend the working potential window (1.6 V) and deliver high energy density of 55.1 Wh kg(-1) and power density of 3200 W kg(-1), respectively. (c) 2018 Elsevier Ltd. All rights reserved.
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