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Switchable wetting of oxygen-evolving oxide catalysts

Journal Article · · Nature Catalysis
 [1];  [2];  [3];  [3];  [4]
  1. Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland); OSTI
  2. Gatan Inc., Pleasanton, CA (United States)
  3. Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
  4. Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland)

The surface wettability of catalysts is typically controlled via surface treatments that promote catalytic performance. Here we report on potential-regulated hydrophobicity/hydrophilicity at cobalt-based oxide interfaces with an alkaline solution. The switchable wetting of single particles, directly related to their activity and stability towards the oxygen evolution reaction, was revealed by electrochemical liquid-phase transmission electron microscopy. Analysis of the movement of the liquid in real time revealed distinctive wettability behaviour associated with specific potential ranges. At low potentials, an overall reduction of the hydrophobicity of the oxides was probed. Upon reversible reconstruction towards the surface oxyhydroxide phase, electrowetting was found to cause a change in the interfacial capacitance. At high potentials, the evolution of molecular oxygen, confirmed by operando electron energy-loss spectroscopy, was accompanied by a globally thinner liquid layer. This work directly links the physical wetting with the chemical oxygen evolution reaction of single particles, providing fundamental insights into solid–liquid interfacial interactions of oxygen-evolving oxides.

Research Organization:
Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E); Swiss National Research Foundation (SNF); Toyota Research Institute
Grant/Contract Number:
AR0001220
OSTI ID:
1904186
Journal Information:
Nature Catalysis, Journal Name: Nature Catalysis Journal Issue: 1 Vol. 5; ISSN 2520-1158
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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