A Functionally Stable RuMn Electrocatalyst for Oxygen Evolution Reaction in Acid. (7th April 2022)

• Record Type: Journal Article
• Authors: An, Lu; Yang, Fan; Fu, Cehuang; Cai, Xiyang; Shen, Shuiyun; Xia, Guofeng; Li, Jing; Du, Yunzhu; Luo, Liuxuan; Zhang, Junliang
• Is Part Of: Advanced functional materials. Volume 32:Number 27(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-04-07
• Subjects: acidic environment -- durability -- oxygen evolution reaction -- ruthenium‐based; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202200131
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Proton exchange membrane water electrolysis (PEMWE) is a key technology to solve the serious energy and environmental problems. However, the poor durability of electrocatalysts in acidic oxygen evolution reaction (OER) environment hinders the large‐scale application of PEMWE. Herein, a robust RuMn electrochemical catalyst with a remarkable durability within 20 000 cyclic voltammetry cycles is reported. Furthermore, RuMn is stable for 720 h at 10 mA cm –2 current density in 0.5 M H2 SO4 solution with <100 mV overpotential increase, outperforming the most electrocatalysts reported to date, by far. An amorphous RuOx shell is detected after the OER test, indicating a surface reconstruction process on the catalyst that inhibits steady‐state dissolution. Further study demonstrates that the excellent durability of RuMn realized by protective RuOx can be attributed to strong bond strength of Ru, which is supported by density functional theory calculations with high dissolution voltage. Thus, improving the bond strength of Ru extends the design strategy for the Ru‐based alloy catalysts with considerable stability. Abstract : RuMn alloy is investigated as a robust oxygen evolution reaction (OER) electrocatalyst in acidic environment. A 720 hour durability test is conducted on RuMn. Surface reconstruction is proven with an amorphous RuOx shell formed on the surface. Further research reveals that the higher binding energy of Ru can lead to a more stable performance during the acidic OER tests.