超级电容器
材料科学
电容
电化学
电流密度
电极
化学工程
功率密度
储能
电解
纳米技术
电解质
化学
量子力学
物理
工程类
物理化学
功率(物理)
作者
Qing Qin,Lulu Chen,Tao Wei,Xien Liu
出处
期刊:Small
[Wiley]
日期:2018-11-22
卷期号:15 (29)
被引量:242
标识
DOI:10.1002/smll.201803639
摘要
Abstract Rational designing of the composition and structure of electrode material is of great significance for achieving highly efficient energy storage and conversion in electrochemical energy devices. Herein, MoS 2 /NiS yolk–shell microspheres are successfully synthesized via a facile ionic liquid‐assisted one‐step hydrothermal method. With the favorable interface effect and hollow structure, the electrodes assembled with MoS 2 /NiS hybrid microspheres present remarkably enhanced electrochemical performance for both overall water splitting and asymmetric supercapacitors. In particular, to deliver a current density of 10 mA cm −2 , the MoS 2 /NiS‐based electrolysis cell for overall water splitting only needs an output voltage of 1.64 V in the alkaline medium, lower than that of Pt/C–IrO 2 ‐based electrolysis cells (1.70 V). As an electrode for supercapacitors, the MoS 2 /NiS hybrid microspheres exhibit a specific capacitance of 1493 F g −1 at current density of 0.2 A g −1 , and remain 1165 F g −1 even at a large current density of 2 A g −1 , implying outstanding charge storage capacity and excellent rate performance. The MoS 2 /NiS‐ and active carbon‐based asymmetric supercapacitor manifests a maximum energy density of 31 Wh kg −1 at a power density of 155.7 W kg −1 , and remarkable cycling stability with a capacitance retention of approximately 100% after 10 000 cycles.
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