Li Jin, Zhang Qiman, Zhang Jian, Wu Naiteng, Liu Guilong, Chen Haipeng, Yuan Changzhou, Liu Xianming
College of Chemistry and Chemical Engineering, and Henan Key Laboratory of Function-Oriented Porous Materials, Luoyang Normal University, Luoyang 471934, PR China.
New Energy Technology Engineering Lab of Jiangsu Province, College of Science, Nanjing University of Posts & Telecommunications (NUPT), Nanjing 210023, PR China.
J Colloid Interface Sci. 2022 Dec;627:862-871. doi: 10.1016/j.jcis.2022.07.118. Epub 2022 Jul 21.
Heterostructure engineering is an efficient strategy to synergisticallyimprove electrocatalytic activity. In this work, Ni/MoO heterojunction nanorods with porous structure self-supported on nickel foam (NF) are elaborately designed through a facile solution-evaporationmethod followed by a thermal reduction process. Prominently, the optimal electrocatalyst Ni/MoO@NF-E delivers an exceptionally low overpotential of 19 mV at the current density of 10 mA cm and a small Tafel slope of 52.3 mV dec toward the hydrogen evolution reaction (HER) in alkaline solution. Concurrently, Ni/MoO@NF-E also maintains excellent stability after 120 h of electrolysis or 5000 cyclic voltammetry cycles. The experimental and density functional theory (DFT) results indicate that the enhanced HER performance of Ni/MoO@NF-E should be ascribed to the porous structure in the Ni/MoO nanorods providing more active catalytic site, the moderate Gibbs free energy of hydrogen adsorption (ΔG), as well as strong synergistic effect between Ni and MoO. This work provides an efficient route for developing HER electrocatalysts in alkaline media.
异质结构工程是一种协同提高电催化活性的有效策略。在这项工作中，通过简便的溶液蒸发法并随后进行热还原过程，精心设计了自支撑在泡沫镍（NF）上的具有多孔结构的Ni/MoO异质结纳米棒。值得注意的是，最佳电催化剂Ni/MoO@NF-E在碱性溶液中对析氢反应（HER）在电流密度为10 mA cm时具有19 mV的极低过电位和52.3 mV dec的小塔菲尔斜率。同时，Ni/MoO@NF-E在120 h电解或5000次循环伏安循环后也保持优异的稳定性。实验和密度泛函理论（DFT）结果表明，Ni/MoO@NF-E增强的HER性能应归因于Ni/MoO纳米棒中的多孔结构提供了更多的活性催化位点、适中的氢吸附吉布斯自由能（ΔG）以及Ni和MoO之间的强协同效应。这项工作为在碱性介质中开发HER电催化剂提供了一条有效途径。
