Journal
ACS ENERGY LETTERS
Volume 7, Issue 3, Pages 993-1000Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.1c02673
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Funding
- Toyota Research Institute
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
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Guided by computational screening and high-throughput experiments, rutile CoSb2O6 has been identified as a promising precious-metal-free electrocatalyst for oxygen reduction in acidic media, demonstrating operational stability and favorable energetics.
Guided by computational Pourbaix screening and high-throughput experiments aimed at the development of precious-metal-free fuel cells, we investigate rutile CoSb2O6 as an electrocatalyst for oxygen reduction in 1 M sulfuric acid. Following 4 h of catalyst conditioning at 0.7 V vs RHE, operation at this potential for 20 h yielded an average current density of -0.17 mA cm(-2) with corrosion at a rate of 0.04 nm hour(-1) that is stoichiometric with catalyst composition. Surface Pourbaix analysis of the (111) surface identified partial H coverage under operating conditions. The Sb active site has an HO* binding free energy of 0.49 eV, which is near the peak of the kinetic 4e(-) ORR volcano for transition-metal oxides in acidic conditions. The experimental demonstration of operational stability and computational identification of a reaction pathway with favorable energetics place rutile CoSb2O6 among the most promising precious-metal-free electrocatalysts for oxygen reduction in acidic media.
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