Back to Search
Start Over
Stability and Activity of Cobalt Antimonate for Oxygen Reduction in Strong Acid
- Source :
- ACS Energy Letters; vol 7, iss 3, 993-1000; 2380-8195
- Publication Year :
- 2022
-
Abstract
- 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.
Details
- Database :
- OAIster
- Journal :
- ACS Energy Letters; vol 7, iss 3, 993-1000; 2380-8195
- Notes :
- application/pdf, ACS Energy Letters vol 7, iss 3, 993-1000 2380-8195
- Publication Type :
- Electronic Resource
- Accession number :
- edsoai.on1377983167
- Document Type :
- Electronic Resource