超级电容器
材料科学
电容
双金属片
化学工程
硫化钴
电化学
电解质
储能
硫化物
钴
电极
硫黄
化学
冶金
纳米技术
无机化学
金属
物理化学
功率(物理)
工程类
物理
量子力学
作者
Xingyue Qian,Yixuan Yin,Yuchen Lu,Jiawei Xia,Bingji Huang,Jingwen Sun,Guangyu He,Haiqun Chen
标识
DOI:10.1016/j.jallcom.2022.165191
摘要
Designing bimetallic sulfide materials with well-defined nanostructure and high energy density is indeed desirable for high-performance supercapacitors. Here, a hollow zinc cobalt sulfide (ZnxCo3−xS4) dodecahedron with plentiful sulfur vacancies is synthesized through a co-precipitation approach followed by a solvothermal vulcanization treatment. The tailored hollow structure can effectively accelerate the charge transport and facilitate the diffusion of OH-, whereas the sulfur vacancies significantly increase the amount of contact active sites and enhance the electronic conductivity. Both of the features can simultaneously promote the capacitance performance of ZnxCo3−xS4 for supercapacitors, where the most-performing Zn0.3Co2.7S4 electrode, achieves a high specific capacitance of 545.9 C g−1 in 3 M KOH electrolyte at the current density of 1 A g−1 and excellent long-term durability of 84.7% capacity retention after 1000 cycles. Particularly, the assembled aqueous hybrid supercapacitors delivers high energy density and superior cyclic stability. This study demonstrates a rational design of well-controlled bimetallic sulfides with outstanding electrochemical performance for energy storage devices.
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