English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Molecular Insight in Structure and Activity of Highly Efficient, Low-Ir Ir-Ni Oxide Catalysts for Electrochemical Water Splitting (OER)

Reier, T., Pawolek, Z., Cherevko, S., Bruns, M., Jones, T., Teschner, D., et al. (2015). Molecular Insight in Structure and Activity of Highly Efficient, Low-Ir Ir-Ni Oxide Catalysts for Electrochemical Water Splitting (OER). Journal of the American Chemical Society, 137(40), 13031-13040. doi:10.1021/jacs.5b07788.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-607D-7 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-607F-3
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Reier, Tobias1, Author
Pawolek, Zarina1, Author
Cherevko, Serhiy2, Author              
Bruns, Michael1, Author
Jones, Travis3, Author              
Teschner, Detre3, Author              
Selve, Soeren1, Author
Bergmann, Arno1, Author
Nong, Hong Nhan1, Author
Schloegl, Robert3, Author              
Mayrhofer, Karl J. J.2, Author              
Strasser, Peter4, Author              
Affiliations:
1external, ou_persistent22              
2Electrocatalysis, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863354              
3Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
4Department of Chemistry, Technical University Berlin, Straße des 17., Berlin, Germany , ou_persistent22              

Content

show
hide
Free keywords: Catalysts; Electrocatalysts; Ionization of gases; Nickel; Oxide films; Photoelectrochemical cells; Proton exchange membrane fuel cells (PEMFC)
 Abstract: Mixed bimetallic oxides offer great opportunities for a systematic tuning of electrocatalytic activity and stability. Here, we demonstrate the power of this strategy using well-defined thermally prepared Ir-Ni mixed oxide thin film catalysts for the electrochemical oxygen evolution reaction (OER) under highly corrosive conditions such as in acidic proton exchange membrane (PEM) electrolyzers and photoelectrochemical cells (PEC). Variation of the Ir to Ni ratio resulted in a volcano type OER activity curve with an unprecedented 20-fold improvement in Jr mass-based activity over pure Ir oxide. In situ spectroscopic probing of metal dissolution indicated that, against common views, activity and stability are not directly anticorrelated. To uncover activity and stability controlling parameters, the Ir-Ni mixed thin oxide film catalysts were characterized by a wide array of spectroscopic, microscopic, scattering, and electrochemical techniques in conjunction with DFT theoretical computations. By means of an intuitive model for the formation of the catalytically active state of the bimetallic Ir-Ni oxide surface, we identify the coverage of reactive surface hydroxyl groups as a suitable descriptor for the OER activity and relate it to controllable synthetic parameters. Overall, our study highlights a novel, highly active oxygen evolution catalyst; moreover, it provides novel important insights into the structure and performance of bimetallic oxide OER electrocatalysts in corrosive acidic environments.

Details

show
hide
Language(s): eng - English
 Dates: 2015-10-14
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000363002900045
DOI: 10.1021/jacs.5b07788
 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: 137 (40) Sequence Number: - Start / End Page: 13031 - 13040 Identifier: ISSN: 0002-7863
CoNE: /journals/resource/954925376870