In-situ reconstructed Ru atom array on α-MnO2 with enhanced performance for acidic water oxidation

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Aug 26, 2023
1 min read

https://doi.org/10.1038/s41929-021-00703-0

Chao Lin, Ji-Li Li, Xiaopeng Li, Shuai Yang, Wei Luo, Yaojia Zhang, Sung-Hae Kim, Dong-Hyung Kim, Sambhaji S. Shinde, Ye-Fei Li, Zhi-Pan Liu, Zheng Jiang & Jung-Ho Lee

Abstract

The development of acid-stable oxygen evolution reaction electrocatalysts is essential for high-performance water splitting. Here, we report an electrocatalyst with Ru-atom-array patches supported on α-MnO2 (Ru/MnO2) for the oxygen evolution reaction following a mechanism that involves only *O and *OH species as intermediates. This mechanism allows direct O–O radical coupling for O2 evolution. Ru/MnO2 shows high activity (161 mV at 10 mA cm−2) and outstanding stability with small degradation after 200 h operation, making it one of the best-performing acid-stable oxygen evolution reaction catalysts. Operando vibrational and mass spectroscopy measurements were performed to probe the reaction intermediates and gaseous products for validating the oxygen evolution reaction pathway. First-principles calculations confirmed the cooperative catalysis mechanism with a reduced energy barrier. Time-dependent elemental analysis demonstrated the occurrence of the in-situ dynamic cation exchange reaction during the oxygen evolution reaction, which is the key for triggering the reconstruction of Ru atoms into the ordered array with high durability.

23 Comments

Mona Spiers

Jan 01

Reading about the in‑situ reconstructed Ru atom array on α‑MnO₂ is fascinating, especially how small atomic tweaks can dramatically boost acidic water oxidation. It reminded me of a week I was so swamped with assignments that I think that someone could pay to do my class just to focus on reading research like this. It’s wild how both science breakthroughs and personal workload stress can feel equally intense sometimes.

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