Yan Zhen-Tong, Tao Shi, Wang Juan, Lu Xiu-Li, Lu Tong-Bu
MOE International Joint Laboratory of Materials Microstructure, Institute for New Energy Materials and Low Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China.
School of Electronic and Information Engineering, Jiangsu Laboratory of Advanced Functional Materials, Changshu Institute of Technology, Changshu, 215500, China.
Adv Mater. 2024 Nov;36(46):e2411942. doi: 10.1002/adma.202411942. Epub 2024 Sep 28.
Alkaline hydrogen evolution reaction (HER) has great potential in practical hydrogen production but is still limited by the lack of active and stable electrocatalysts. Herein, the efficient water dissociation process, fast transfer of adsorbed hydroxyl and optimized hydrogen adsorption are first achieved on a cooperative electrocatalyst, named as Ru-Sn/SnO NS, in which the Ru-Sn dual metal sites and SnO heterojunction are constructed based on porous Ru nanosheet. The density functional theory (DFT) calculations and in situ infrared spectra suggest that Ru-Sn dual sites can optimize the water dissociation process and hydrogen adsorption, while the existence of SnO can induce the unique hydroxyl spillover effect, accelerating the hydroxyl transfer process and avoiding the poison of active sites. As results, Ru-Sn/SnO NS display remarkable alkaline HER performance with an extremely low overpotential (12 mV at 10 mA cm) and robust stability (650 h), much superior to those of Ru NS (27 mV at 10 mA cm with 90 h stability) and Ru-Sn NS (16 mV at 10 mA cm with 120 h stability). The work sheds new light on designing of efficient alkaline HER electrocatalyst.
碱性析氢反应（HER）在实际制氢中具有巨大潜力，但仍受限于缺乏活性和稳定的电催化剂。在此，首次在一种名为Ru-Sn/SnO NS的协同电催化剂上实现了高效的水离解过程、吸附羟基的快速转移和优化的氢吸附，其中Ru-Sn双金属位点和SnO异质结基于多孔Ru纳米片构建。密度泛函理论（DFT）计算和原位红外光谱表明，Ru-Sn双位点可以优化水离解过程和氢吸附，而SnO的存在可以诱导独特的羟基溢流效应，加速羟基转移过程并避免活性位点中毒。结果，Ru-Sn/SnO NS表现出卓越的碱性HER性能，过电位极低（10 mA cm时为12 mV）且稳定性强（650 h），远优于Ru NS（10 mA cm时为27 mV，稳定性为90 h）和Ru-Sn NS（10 mA cm时为16 mV，稳定性为120 h）。这项工作为高效碱性HER电催化剂的设计提供了新的思路。
