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Title: Operando investigation of Au-MnO x thin films with improved activity for the oxygen evolution reaction

The electrochemical splitting of water holds great potential as a method for producing clean fuels by storing electricity from intermittent energy sources. The efficiency of such a process would be greatly facilitated by incorporating more active catalysts based on abundant materials for the oxygen evolution reaction. Manganese oxides are promising as catalysts for this reaction. Recent reports show that their activity can be drastically enhanced when modified with gold. Herein, we investigate highly active mixed Au-MnO x thin films for the oxygen evolution reaction, which exhibit more than five times improvement over pure MnO x. These films are characterized with operando X-ray Absorption Spectroscopy, which reveal that Mn assumes a higher oxidation state under reaction conditions when Au is present. As a result, the magnitude of the enhancement is correlated to the size of the Au domains, where larger domains are the more beneficial.
 [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [1] ;  [1] ;  [4]
  1. Technical Univ. of Denmark, Lyngby (Denmark)
  2. Stanford Univ., Stanford, CA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Electrochimica Acta
Additional Journal Information:
Journal Volume: 230; Journal Issue: C; Journal ID: ISSN 0013-4686
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; water oxidation; electrocatalysis; X-ray absorption spectroscopy; operando study
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1413349