Hydrogen spillover in complex oxide multifunctional sites improves acidic hydrogen evolution electrocatalysis

Jie Dai, Yinlong Zhu, Yu Chen, Xue Wen, Mingce Long, Xinhao Wu, Zhiwei Hu, Daqin Guan, Xixi Wang, Chuan Zhou, Qian Lin, Yifei Sun, Shih-Chang Weng, Huanting Wang, Wei Zhou, Zongping Shao

Research output: Contribution to journalArticleResearchpeer-review

128 Citations (Scopus)

Abstract

Improving the catalytic efficiency of platinum for the hydrogen evolution reaction is valuable for water splitting technologies. Hydrogen spillover has emerged as a new strategy in designing binary-component Pt/support electrocatalysts. However, such binary catalysts often suffer from a long reaction pathway, undesirable interfacial barrier, and complicated synthetic processes. Here we report a single-phase complex oxide La2Sr2PtO7+δ as a high-performance hydrogen evolution electrocatalyst in acidic media utilizing an atomic-scale hydrogen spillover effect between multifunctional catalytic sites. With insights from comprehensive experiments and theoretical calculations, the overall hydrogen evolution pathway proceeds along three steps: fast proton adsorption on O site, facile hydrogen migration from O site to Pt site via thermoneutral La-Pt bridge site serving as the mediator, and favorable H2 desorption on Pt site. Benefiting from this catalytic process, the resulting La2Sr2PtO7+δ exhibits a low overpotential of 13 mV at 10 mA cm−2, a small Tafel slope of 22 mV dec−1, an enhanced intrinsic activity, and a greater durability than commercial Pt black catalyst.

Original languageEnglish
Article number1189
Number of pages10
JournalNature Communications
Volume13
Issue number1
DOIs
Publication statusPublished - 4 Mar 2022

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