IrW nanochannel support enabling ultrastable electrocatalytic oxygen evolution at 2 A cm−2 in acidic media

Rui Li, Haiyun Wang, Fei Hu, K. C. Chan, Xiongjun Liu, Zhaoping Lu, Jing Wang, Zhibin Li, Longjiao Zeng, Yuanyuan Li, Xiaojun Wu, Yujie Xiong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

A grand challenge for proton exchange membrane electrolyzers is the rational design of oxygen evolution reaction electrocatalysts to balance activity and stability. Here, we report a support-stabilized catalyst, the activated ~200 nm-depth IrW nanochannel that achieves the current density of 2 A cm−2 at an overpotential of only ~497 mV and maintains ultrastable gas evolution at 100 mA cm−2 at least 800 h with a negligible degradation rate of ~4 μV h−1. Structure analyses combined with theoretical calculations indicate that the IrW support alters the charge distribution of surface (IrO2)n clusters and effectively confines the cluster size within 4 (n≤4). Such support-stabilizing effect prevents the surface Ir from agglomeration and retains a thin layer of electrocatalytically active IrO2 clusters on surface, realizing a win-win strategy for ultrahigh OER activity and stability. This work would open up an opportunity for engineering suitable catalysts for robust proton exchange membrane-based electrolyzers.

Original languageEnglish
Article number3540
JournalNature Communications
Volume12
Issue number1
DOIs
Publication statusPublished - Dec 2021

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this