Dilute molybdenum atoms embedded in hierarchical nanoporous copper accelerate the hydrogen evolution reaction
Dilute molybdenum atoms embedded in hierarchical nanoporous copper accelerate the hydrogen evolution reaction
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嵌入分级纳米孔铜中的稀钼原子加速析氢反应
DOI：
10.1016/j.scriptamat.2020.09.011
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发表时间：
2021
影响因子：
6
通讯作者：
Yongwen Tan
中科院分区：
文献类型：
--
作者：
Wei Peng;Min Luo;Yang Zhao;Jiao Lan;Ming Peng;Jiuhui Han;Hongju Li;Yongwen Tan
开发地球资源丰富、非贵金属、高性能的析氢反应电催化剂仍然是能源转换系统中一个极具挑战性但至关重要的问题。在此，我们报道了一种自支撑的钼修饰的分级纳米多孔铜作为一种有效的析氢电催化剂。优化后的纳米孔Cu-Mo电催化剂具有极低的Mo含量，表现出高的HER活性，起始电位可以忽略不计，小的Tafel斜率，在碱性溶液中具有优异的耐久性。脱合金过程为纳米孔Cu-Mo电催化剂提供了独特的三维互连双连续纳米孔结构，不仅可以为HER提供高密度的催化活性位，而且可以加速氢分子从催化剂表面的脱附。密度泛函理论（DFT）计算结果表明，Mo的引入促进了Cu基体对水的吸附和解离，优化了H中间体的吸附-脱附热力学，从而提高了纳米多孔Cu-Mo电催化剂的本征HER活性.
The development of earth-abundant, non-noble, high-performance hydrogen evolution reaction (HER) electrocatalysts is still a highly challenging but vitally important issue for energy conversion system. Herein, we reported a self-supported Mo modified hierarchical nanoporous Cu as an efficient electrocatalyst for hydrogen evolution. The optimized nanoporous Cu-Mo electrocatalysts with extremely dilute Mo content exhibits a high HER activity with a negligible onset potential, a small Tafel slope, and an excellent durability in alkaline solution. The dealloying process provides nanoporous Cu-Mo electrocatalysts a unique three-dimensional interconnected bicontinuous nanoporous architecture, which can not only offer high-density catalytic active sites for HER, but also accelerate the desorption of hydrogen molecule from catalysts surface. Density functional theory (DFT) calculations reveal that the introducing of Mo into Cu matrix can accelerate water adsorption and dissociation and optimize adsorption-desorption energetics of H intermediates, thus improving the intrinsic HER activity of nanoporous Cu-Mo electrocatalysts.