Bulk OsO_2 Single Crystals: Superior Catalysts for Water Oxidation

Guojian Zhao ¹Zhihao Li ²Ziang Meng ¹Shucheng Wang ²Li Liu ¹Zhiyuan Duan ¹Xiaoning Wang ³Hongyu Chen ¹Yuzhou He ⁴Jingyu Li ¹Sixu Jiang ¹Xiaoyang Tan ¹Qinghua Zhang ⁴Qianfan Zhang ²Peixin Qin ¹Zhiqi Liu¹

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作者信息

1. School of Materials Science and Engineering, Beihang University, Beijing, China||State Key Laboratory of Tropic Ocean Engineering Materials and Materials Evaluation, Beihang University, Beijing, China
2. School of Materials Science and Engineering, Beihang University, Beijing, China
3. The Analysis & Testing Center, Beihang University, Beijing, China
4. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China
折叠

Abstract

Although rutile RuO_2 has been a well-known and almost the best oxygen evolution reaction (OER) catalyst, the OER properties for the similar rutile oxide OsO_2 with the same group element with Ru have been unknown, mainly due to long-standing synthesis difficulties. In this work, we report the successful synthesis of high-quality OsO_2 single crystals, and the ground micrometer-size single crystals are chemically stable in alkaline solutions and exhibit robust OER performance. In sharp contrast, OsO_2 nanopowder reacts quickly with KOH solutions and cannot work for OER. Compared with commercial RuO_2 nanopowder, the OsO_2 single crystals show comparable catalytic current densities, remarkably lower overpotentials at high current densities and better stability. These findings question the universal applicability of nanoscaling and highlight crystal integrity as a key descriptor for achieving stable and efficient OER electrocatalysis.

Key words

bulk single crystal catalysts/high stability/OER performance/OsO_2 single crystals/RuO_2

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出版年

2026

Advanced materials for optics and electronics

ISSN：1616-301X

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