期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 15, 页码 9721-9732出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b01268
关键词
hollow structure; nickel cobalt sulfide; Kirkendall effect; supercapacitor; cation-exchange reaction; hydrothermal synthesis
资金
- National Natural Science Foundation of China [21406191]
- China Postdoctoral Science Foundation [2012M520597, 2015T80232]
- Specialized Research Fund for the Doctoral Program of Higher Education [20131333120011]
- Youth Top-Notch Talent Support Program of Higher Education in Hebei Province [BJ2016053]
- Natural Science Foundation of Hebei Province [B2015203406]
To construct a suitable three-dimensional structure for ionic transport on the surface of the active materials for a supercapacitor, porous hollow nickel cobalt sulfides are successfully synthesized via a facile and efficient cation-exchange reaction in a hydrothermal process involving the Kirkendall effect with gamma-MnS nanorods as a sacrificial template. The formation mechanism of the hollow nickel cobalt sulfides is carefully illustrated via the tuning reaction time and reaction temperature during the Cation-exchange process. Due to the ingenious porous 'hollow structure that offers a high surface area for electrochemical reaction and suitable pathrs for ionic transport, porous hollow nickel cobalt sulfide electrodes exhibit high electrochemical performance. The Ni1.77Co1.23S4 electrode delivers a high specific capacity of 224.5 mAh g(-1) at a current density of 0.25 A g(-1) and a high capacity retention of 87.0% at 10 A g(-1). An all-solid-state asymmetric supercapacitor, assembled with a Ni1.77Co1.23S4 electrode as the positive electrode and a homemade activated carbon electrode as the negative electrode (denoted as NCS//HMC), exhibits a high energy density of 42.7 Wh kg(-1) at a power density of 190.8 W kg(-1) and even 29.4 Wh kg(-1) at 3.6 kW kg(-1). The fully charged as-prepared asymmetric supercapacitor can light up a light emitting diode (LED) indicator for more than 1 h, indicating promising practical applications of the hollow nickel cobalt sulfides and the NCS//HMC asymmetric supercapacitor.
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