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Enriched Electrophilic Oxygen Species on Ru Optimize Acidic Water Oxidation.

Authors :: Zhao T
Du R
Fang Q
Hao G
Liu G
Zhong D
Li J
Zhao Q
Source :: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Dec 23, pp. e2410311. Date of Electronic Publication: 2024 Dec 23.
Publication Year :: 2024
Publisher :: Ahead of Print
Abstract: Ruthenium oxide (RuO <subscript>2</subscript> ) is considered one of the most promising catalysts for replacing iridium oxide (IrO <subscript>2</subscript> ) in the acidic oxygen evolution reaction (OER). Nevertheless, the performance of RuO <subscript>2</subscript> remains unacceptable due to the dissolution of Ru and the lack of *OH in acidic environments. This paper reports a grain boundary (GB)-rich porous RuO <subscript>2</subscript> electrocatalyst for the efficient and stable acidic OER. The involvement of GB regulates the valence state of Ru and weakens the interaction between Ru and O, effectively facilitating *OH adsorption and *OOH formation. Notably, achieved a record-high catalytic activity (145 mV at 10 mA cm <superscript>-2</superscript> ) with a low Tafel slope (40.9 mV dec <superscript>-1</superscript> ) and a remarkable mass activity of 332 mA mg <superscript>-1</superscript> <subscript>Ru</subscript> at 1.5 V versus reversible hydrogen electrode is achieved. Additionally, the porous RuO <subscript>2</subscript> exhibits superb stability with an ultra-low degradation rate of 26 µV h <superscript>-1</superscript> over a 50-day durability test. This study opens a viable pathway for the development of efficient and robust Ru-based acidic OER electrocatalysts.<br /> (© 2024 Wiley‐VCH GmbH.)