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Title: Synergistic Co─Ir/Ru Composite Electrocatalysts Impart Efficient and Durable Oxygen Evolution Catalysis in Acid

Journal Article · · Advanced Energy Materials
ORCiD logo [1];  [2];  [3];  [4];  [4];  [5]
  1. Chemical Science and Engineering Division Argonne National Laboratory 9700 S Cass Ave Lemont IL 60439 USA, Hydrogen Energy Center State Key Laboratory of Shanghai School of Chemical Science and Engineering Shanghai Jiao Tong University 800 Dongchuan Road, Minhang Shanghai 200240 China
  2. Center for Nanoscale Materials Argonne National Laboratory 9700 S Cass Ave Lemont IL 60439 USA
  3. State Key Lab of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China
  4. Chemical Science and Engineering Division Argonne National Laboratory 9700 S Cass Ave Lemont IL 60439 USA
  5. Hydrogen Energy Center State Key Laboratory of Shanghai School of Chemical Science and Engineering Shanghai Jiao Tong University 800 Dongchuan Road, Minhang Shanghai 200240 China

Abstract Exploring highly active and robust catalysts, which have low precious metal content, to boost the kinetically sluggish oxygen evolution reaction (OER) is a key concern for hydrogen production via proton exchange membrane water electrolysis (PEMWE). Here, rational engineering of the morphology and the local geometric ligand environment of Ir and Ru catalysts are presented by using defect‐rich, lanthanum‐ and lithium‐doped Co 3 O 4 nanofiber (LLCF) as substrate that promotes the electrocatalytic OER. Two catalysts, IrCoOx@LLCF and RuCoOx@LLCF, achieve mass activities of 1013.5 A g Ir −1 and 1911.4 A g Ru −1 in 0.1  m HClO 4 at 300 mV overpotential, respectively, which are 26 and 50 times higher than that of commercial IrO 2 and RuO 2 . Operando X‐ray absorption spectroscopy unveils the reversible structure of IrCoOx during the OER and the suppression of over‐oxidation of Co and Ir, giving rise to high stability. Density functional theory calculations reveal that the local geometric ligand engineering optimizes the binding of oxygenated species to the active sites, resulting in strongly enhanced catalytic activity.

Sponsoring Organization:
USDOE
OSTI ID:
1995874
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials Vol. 13 Journal Issue: 37; ISSN 1614-6832
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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