Advanced Materials and Catalysis Group, Center for Chemistry of High-performance and Novel Materials, Department of Chemistry, Zhejiang University , Hangzhou 310028, P. R. China.
ACS Appl Mater Interfaces. 2017 Mar 1;9(8):7139-7147. doi: 10.1021/acsami.6b15377. Epub 2017 Feb 15.
The research of a robust catalytic system based on single NiO electrocatalyst for hydrogen evolution reaction (HER) remains a huge challenge. Particularly, the factors that dominate the catalytic properties of NiO-based hybrids for HER have not been clearly demonstrated. Herein, a convenient protocol for the fabrication of NiO@bamboo-like carbon nanotube hybrids (NiO@BCNTs) is designed. The hybrids exhibit superb catalytic ability and considerable durability in alkaline solution. A benchmark HER current density of 10 mA cm has been achieved at an overpotential of ∼79 mV. In combination with the experimental results and density functional theory (DFT) calculations, this for the first time definitely validates that the inherent high Ni ratio and the Ni on the interface of Ni/NiO play a vital role in the outstanding catalytic performance. Especially, the Ni on the interface of Ni/NiO performs superior activity for water splitting compared with that of bulk Ni. These conclusions provide guidance for the rational design of the future non-noble metallic catalysts.
基于单一氧化镍电催化剂的高效催化体系对于析氢反应（HER）的研究仍然是一个巨大的挑战。特别是，主导 NiO 基混合材料析氢催化性能的因素还没有得到明确的证明。在此，设计了一种制备 NiO@竹状碳纳米管复合材料（NiO@BCNTs）的简便方案。该复合材料在碱性溶液中表现出优异的催化能力和较高的耐久性。在过电势约为 79 mV 时，达到了 10 mA cm 的基准 HER 电流密度。结合实验结果和密度泛函理论（DFT）计算，这首次明确证实了固有高镍比和 Ni/NiO 界面上的 Ni 对其优异的催化性能起着至关重要的作用。特别是，Ni/NiO 界面上的 Ni 对水分解的活性优于体相 Ni。这些结论为未来非贵金属催化剂的合理设计提供了指导。
