Stability and Activity of Cobalt Antimonate for Oxygen Reduction in Strong Acid

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 t...

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Published in:ACS energy letters 2022-02, Vol.7 (3)
Main Authors: Zhou, Lan, Li, Hao, Lai, Yungchieh, Richter, Matthias, Kan, Kevin, Haber, Joel A., Kelly, Sara, Wang, Zhenbin, Lu, Yubing, Kim, R. Soyoung, Li, Xiang, Yano, Junko, Nørskov, Jens K., Gregoire, John M.
Format: Article
Language:English
Subjects:
catalysts
electrolytes
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
metals
oxides
redox reactions
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Summary: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. Furthermore, 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.
ISSN:2380-8195
2380-8195