Wang Shuang, Li Zhengrong, Shen Tao, Wang Deli
Key laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, P. R. China.
ChemSusChem. 2023 Apr 21;16(8):e202202128. doi: 10.1002/cssc.202202128. Epub 2023 Mar 13.
The alkaline hydrogen evolution reaction (HER) is of great significance for the large-scale green H production. Currently, pressing challenges in the fabrication of cost-effective HER electrocatalysts are related to their sluggish water dissociation kinetics. Herein, a facile strategy to accelerate the desorption of HER intermediates and water dissociation is proposed. RuNi nanoalloy confined within N-doped carbon shells (Ru Ni @NC/C) with optimized Ru/Ni ratio and the dicyandiamide dosage was prepared. It displays an overpotential (η ) of 16 mV, Tafel slope of 29.9 mV dec , and long-term stability over 10 000 cycles. The decent HER performance on Ru Ni @NC/C stems from the core-shell structure that is favoring the exposure of dispersed active sites, and the synergistic effect to promote water capture and dissociation. This work provides insight into the relationship between the HER performance and the electrochemical behavior of the intermediate adsorbed state, and paves an avenue toward rational design efficient electrocatalysts for HER.
碱性析氢反应（HER）对于大规模绿色制氢具有重要意义。目前，制备具有成本效益的HER电催化剂面临的紧迫挑战与其缓慢的水解离动力学有关。在此，提出了一种加速HER中间体脱附和水解离的简便策略。制备了Ru/Ni比例和双氰胺用量优化的、限制在N掺杂碳壳内的RuNi纳米合金（RuNi@NC/C）。它表现出16 mV的过电位（η）、29.9 mV dec⁻¹的塔菲尔斜率以及超过10000次循环的长期稳定性。RuNi@NC/C上良好的HER性能源于有利于暴露分散活性位点的核壳结构以及促进水捕获和解离的协同效应。这项工作深入了解了HER性能与中间吸附态电化学行为之间的关系，并为合理设计高效的HER电催化剂铺平了道路。
