Direct electrochemical growth of amorphous molybdenum sulfide nanosheets on Ni foam for high-performance supercapacitors
Direct electrochemical growth of amorphous molybdenum sulfide nanosheets on Ni foam for high-performance supercapacitors
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用于高性能超级电容器的泡沫镍上直接电化学生长非晶硫化钼纳米片
DOI：
10.1016/j.jcis.2018.07.127
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发表时间：
2018
影响因子：
9.9
通讯作者：
Song Wenbo
中科院分区：
文献类型：
--
作者：
Shang Mengxiang;Du Cuicui;Huang Hao;Mao Jianxin;Liu Peng;Song Wenbo
结晶硫化钼（MoSx）由于其特定的原子结构和高的理论比电容，作为超级电容器的电极材料而备受关注。然而，较差的导电性和很少的活性位点以及严格控制的合成过程限制了它们的电容性能。在这项工作中，通过简单且低成本的电沉积技术，在泡沫镍上直接生长了具有多孔结构的非晶MoSx(a-MoSx)纳米片。通过直接使用a-MoSx/Ni泡沫作为超级电容器的电极材料，在1A/g下实现了463F/g的高比电容，并且在高倍率下具有良好的循环稳定性。非晶相的各向同性和多孔性质以及离子库功能提供了丰富的活性位点、离子传输通道和大的电极/电解质接触面积，确保电解质在活性材料内轻松扩散。电沉积材料与下面的泡沫镍基底的强粘合力在充电和放电过程中构建了有效的电子传输通道。这项工作强调了电沉积非晶 MoSx 在超级电容器潜在应用中的重要性。
Crystalline molybdenum sulfides (MoSx) have gained much attention as electrode materials for supercapacitors due to their specific atomic structure and high theoretical specific capacitance. However, poor electric conductivity and few accessible active sites as well as strictly controlled synthetic processes limit their capacitive performances. In this work, amorphous MoSx(a-MoSx) nanosheets with porous structure was directly grown on Ni foam by a simple and low-cost electrodeposition technique. By using a-MoSx/Ni foam directly as the electrode material for supercapacitor, a high specific capacitance of 463 F/g was achieved at 1 A/g with good cycling stability at high rate. The isotropic and porous natures as well as ion reservoir function of the amorphous phase offers abundant active sites, transportation channels for ions and large electrode/electrolyte contact area, ensuring facile electrolyte diffusion within the active material. The strong adhesive of electrodeposited material to the underlying Ni foam substrate constructs an effective electron transport channel during the charging and discharging process. This work highlights the importance of electrodeposited amorphous MoSxfor potential application in supercapacitors.