English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Identifying key structural features of IrOx water splitting catalysts

Willinger, E., Massué, C., Schlögl, R., & Willinger, M. G. (2017). Identifying key structural features of IrOx water splitting catalysts. Journal of the American Chemical Society, 139(34), 12093-12101. doi:10.1021/jacs.7b07079.

Item is

Files

show Files
hide Files
:
article (publisher version).pdf (Publisher version), 5MB
 
File Permalink:
-
Name:
article (publisher version).pdf
Description:
-
Visibility:
Restricted (Max Planck Institute of Colloids and Interfaces, MTKG; )
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Willinger, Elena, Author
Massué, Cyriac, Author
Schlögl, Robert, Author
Willinger, Marc Georg1, Author              
Affiliations:
1Max Planck Institute of Colloids and Interfaces, Department of Colloid Chemistry, Research Campus Golm, 14424 Potsdam, Germany, ou_persistent22              

Content

show
hide
Free keywords: -
 Abstract: Hydrogen production by electrocatalytic water splitting will play a key role in the realization of a sustainable energy supply. Owing to their relatively high stability and activity, iridium (hydr)oxides have been identified as most promising catalysts for the oxidation of water. Comprehensive spectroscopic and theoretical studies on the basis of Rutile IrO2 have provided insight about the electronic structure of the active X-ray amorphous phase. However, due to the absence of long-range order and missing information about the local arrangement of structural units, our present understanding of the active phase is very unsatisfying. In this work, using a combination of real-space atomic scale imaging with atomic pair distribution function analysis and local measurements of the electronic structure, we identify key structural motifs that are associated with high water splitting activity. Comparison of two X-ray amorphous phases with distinctively different electrocatalytic performance reveals that high activity is linked to the ratio between corner- and edgesharing IrO6 octahedra. We show that the active and stable phase consists of single unit cell sized Hollandite-like structural domains that are cross-linked through undercoordinated oxygen/iridium atoms. In the less active phase, the presence of the Rutile phase structural motif results in a faster structural collapse and deactivation. The presented results provide insight in the structure-activity relation and promote a rational synthesis of X-ray amorphous IrOx hydroxides that contain a favorable arrangement of structural units for improved performance in catalytic water splitting.

Details

show
hide
Language(s): eng - English
 Dates: 2017-08-092017
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/jacs.7b07079
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Journal of the American Chemical Society
  Other : J. Am. Chem. Soc.
  Abbreviation : JACS
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 139 (34) Sequence Number: - Start / End Page: 12093 - 12101 Identifier: ISSN: 0002-7863