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One-step extended strategy for the ionic liquid-assisted synthesis of Ni₃S₄–MoS₂ heterojunction electrodes for supercapacitors

Luo, Wenhao, Zhang, Guofeng, Cui, Yingxue, Sun, Yan, Qin, Qing, Zhang, Jing, Zheng, Wenjun
Journal of materials chemistry A 2017 v.5 no.22 pp. 11278-11285
batteries, catalysts, cobalt, electrodes, energy density, manganese, molybdenum disulfide, viability
A convenient, self-assembly, ionic liquid-assisted method for the preparation of a Ni₃S₄–MoS₂ heterojunction is reported. The Ni₃S₄ support not only provided high conductivity in the heterojunction for MoS₂, but also showed more compatibility with MoS₂, allowing a long cycle life. The capacity of the Ni₃S₄–MoS₂ heterojunction is 985.21 F g⁻¹ at a current density of 1 A g⁻¹, and it can retain 573 F g⁻¹ after 20 000 cycles at a current density of 10 A g⁻¹. The Ni₃S₄–MoS₂//AC (ASC) device demonstrated a high energy density of 58.43 W h kg⁻¹ when the power density reached 385.95 W kg⁻¹, and it can retain an energy density of 18.75 W h kg⁻¹ even at a high power density of 7500 W kg⁻¹, revealing its potential and viability for practical applications. Furthermore, this work provides a novel method to synthesize MₓSy–MoS₂ (M = Co, Mn, etc.) heterojunction materials in one step. These heterojunction materials could be used in a wide range of fields such as in HER catalysts, Li ion batteries and supercapacitor electrodes.