Title: Oxide‐Supported IrNiO _x Core–Shell Particles as Efficient, Cost‐Effective, and Stable Catalysts for Electrochemical Water Splitting

Abstract

Abstract Active and highly stable oxide‐supported IrNiO _x core–shell catalysts for electrochemical water splitting are presented. IrNi _x @IrO _x nanoparticles supported on high‐surface‐area mesoporous antimony‐doped tin oxide (IrNiO _x  /Meso‐ATO) were synthesized from bimetallic IrNi _x precursor alloys (PA‐IrNi _x  /Meso‐ATO) using electrochemical Ni leaching and concomitant Ir oxidation. Special emphasis was placed on Ni/NiO surface segregation under thermal treatment of the PA‐IrNi _x  /Meso‐ATO as well as on the surface chemical state of the particle/oxide support interface. Combining a wide array of characterization methods, we uncovered the detrimental effect of segregated NiO phases on the water splitting activity of core–shell particles. The core–shell IrNiO _x  /Meso‐ATO catalyst displayed high water‐splitting activity and unprecedented stability in acidic electrolyte providing substantial progress in the development of PEM electrolyzer anode catalysts with drastically reduced Ir loading and significantly enhanced durability.

Authors:

Nong, Hong Nhan; Oh, Hyung‐Suk; Reier, Tobias; Willinger, Elena; Willinger, Marc‐Georg; Petkov, Valeri; Teschner, Detre; Strasser, Peter

Publication Date:

Wed Jan 21 00:00:00 EST 2015

Sponsoring Org.:

USDOE

OSTI Identifier:

1464533

Grant/Contract Number:  

DE‐SC0006877

Resource Type:

Publisher's Accepted Manuscript

Journal Name:

Angewandte Chemie

Additional Journal Information:

Journal Name: Angewandte Chemie Journal Volume: 127 Journal Issue: 10; Journal ID: ISSN 0044-8249

Publisher:

Wiley Blackwell (John Wiley & Sons)

Country of Publication:

Germany

Language:

English