材料科学
分解水
兴奋剂
电流密度
化学工程
镍
氢
热液循环
纳米技术
制氢
碳纤维
电解
电极
催化作用
光电子学
化学
电解质
复合材料
物理化学
冶金
工程类
物理
复合数
有机化学
量子力学
生物化学
光催化
作者
Xue Yang,Xiaojing Bai,Yanyan Xu,Qing Yan,Min Zhu,Kai Zhu,Ke Ye,Jun Yan,Dianxue Cao,Dianxue Cao
标识
DOI:10.1016/j.compositesb.2021.109229
摘要
Developing efficient hydrogen evolution reaction (HER) electrocatalysts is extremely important for large-scale hydrogen production from water splitting. In this work, ultra-small MoS2 nanosheets with 5% Ni doping grown on both sides of hollow carbon microtubes (5%-Ni-MoS2/aCMT) are prepared by a hydrothermal method. The vertically oriented Ni-doped MoS2 nanosheets provide more active sites for HER, while open porous structure promotes ions transport, and hollow carbon microtube substrate accelerates electrons transport as well as hydrogen release. Density functional theory (DFT) analysis proves that the optimal amount of Ni doping can effectively adjust the electronic structure of MoS2. As a result, 5%-Ni-MoS2/aCMT electrode exhibits enhanced kinetics for HER in both acidic and alkaline conditions. To deliver the current density of 10 mA cm−2, it requires overpotentials of 140 and 88 mV in 1 M KOH and 0.5 M H2SO4. 5%-Ni-MoS2/aCMT exhibits better stability than commercial Pt/C at a high current density of 200 mA cm−2. Moreover, 5%-Ni-MoS2/aCMT/NF (nickel foam) || RuO2/NF electrolyzer exhibits ultra-long stability of 30 h at the current density of 100 mA cm−2 and excellent overall water splitting performance with requiring low cell voltages of 1.52 and 1.71 V to generate current densities of 10 and 50 mA cm−2.
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