Single-phase perovskite oxide with super-exchange induced atomic-scale synergistic active centers enables ultrafast hydrogen evolution

Jie Dai, Yinlong Zhu, Hassan A. Tahini, Qian Lin, Yu Chen, Daqin Guan, Chuan Zhou, Zhiwei Hu, Hong Ji Lin, Ting Shan Chan, Chien Te Chen, Sean C. Smith, Huanting Wang, Wei Zhou, Zongping Shao

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11 Citations (Scopus)

Abstract

The state-of-the-art active HER catalysts in acid media (e.g., Pt) generally lose considerable catalytic performance in alkaline media mainly due to the additional water dissociation step. To address this issue, synergistic hybrid catalysts are always designed by coupling them with metal (hydro)oxides. However, such hybrid systems usually suffer from long reaction path, high cost and complex preparation methods. Here, we discover a single-phase HER catalyst, SrTi0.7Ru0.3O3-δ (STRO) perovskite oxide highlighted with an unusual super-exchange effect, which exhibits excellent HER performance in alkaline media via atomic-scale synergistic active centers. With insights from first-principles calculations, the intrinsically synergistic interplays between multiple active centers in STRO are uncovered to accurately catalyze different elementary steps of alkaline HER; namely, the Ti sites facilitates nearly-barrierless water dissociation, Ru sites function favorably for OH* desorption, and non-metal oxygen sites (i.e., oxygen vacancies/lattice oxygen) promotes optimal H* adsorption and H2 desorption.

Original languageEnglish
Article number5657
Number of pages10
JournalNature Communications
Volume11
Issue number1
DOIs
Publication statusPublished - Dec 2020

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