Efficient Hydrogen Evolution on Cu Nanodots-Decorated Ni3S2 Nanotubes by Optimizing Atomic Hydrogen Adsorption and Desorption
Efficient Hydrogen Evolution on Cu Nanodots-Decorated Ni3S2 Nanotubes by Optimizing Atomic Hydrogen Adsorption and Desorption
复制标题
通过优化原子氢吸附和解吸，在 Cu 纳米点修饰的 Ni3S2 纳米管上高效析氢
DOI：
10.1021/jacs.7b08521
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发表时间：
2018-01-17
影响因子：
15
通讯作者：
Li, Gao-Ren
中科院分区：
文献类型：
--
作者：
Feng, Jin-Xian;Wu, Jin-Qi;Li, Gao-Ren
低成本的过渡金属二硫属化合物（MS 2）作为替代催化剂引起了人们极大的兴趣。然而，一个显著的挑战是在MS 2上形成硫-氢键（S-H-ads），这将严重抑制析氢反应（HER）。在这里，我们报告铜纳米点（ND）修饰的Ni 3S 2纳米管（NTs）负载在碳纤维（CF）（Cu ND/Ni 3S 2 NTs-CF）作为有效的电催化剂，在碱性介质中的HER。Cu和Ni 3S 2之间的电子相互作用导致带正电荷的Cu ND，并且可以促进水吸附和活化。同时，Ni 3S 2纳米管带负电荷，可以削弱催化剂表面形成的S-H-ads键。因此，Cu/Ni 3S 2杂化材料可以优化H在电催化剂上的吸附和脱附，促进H的Volmer和Heyrovsky步骤。Cu和Ni 3S 2之间的强相互作用使Cu NDs/Ni 3S 2 NTs-CFs电催化剂表现出优异的HER催化性能，具有低的起始电位、高的催化活性和优异的稳定性。
Low-cost transition-metal dichalcogenides (MS2) have attracted great interest as alternative catalysts for hydrogen evolution. However, a significant challenge is the formation;of sulfur-hydrogen bonds on MS2 (S-H-ads), which will severely suppress hydrogen evolution reaction (HER). Here we report Cu nanodots (NDs)-decorated Ni3S2 nanotubes (NTs) supported on carbon fibers (CFs) (Cu NDs/Ni3S2 NTs-CFs) as efficient electrocatalysts for HER in alkaline media. The electronic interactions between Cu and Ni3S2 result in Cu NDs that are positively charged arid can promote water adsorption and activation. Meanwhile, Ni3S2 NTs are negatively charged and can weaken S-H-ads bonds formed on catalyst surfaces. Therefore, the Cu/Ni3S2 hybrids can optimize H adsorption and desorption on electrocatalysts and can promote both Volmer and Heyrovsky steps of HER The strong interactions between Cu and Ni3S2 cause the Cu NDs/Ni3S2 NTs-CFs electrocatalysts to exhibit the outstanding HER catalytic performance with low onset potential, high catalytic activity, and excellent stability.