TY - JOUR
T1 - Stability and Activity of Cobalt Antimonate for Oxygen Reduction in Strong Acid
AU - Zhou, Lan
AU - Li, Hao
AU - Lai, Yungchieh
AU - Richter, Matthias
AU - Kan, Kevin
AU - Haber, Joel A.
AU - Kelly, Sara
AU - Wang, Zhenbin
AU - Lu, Yubing
AU - Kim, R. Soyoung
AU - Li, Xiang
AU - Yano, Junko
AU - Nørskov, Jens K.
AU - Gregoire, John M.
PY - 2022/3/11
Y1 - 2022/3/11
N2 - 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. © 2022 American Chemical Society
AB - 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. © 2022 American Chemical Society
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U2 - 10.1021/acsenergylett.1c02673
DO - 10.1021/acsenergylett.1c02673
M3 - RGC 21 - Publication in refereed journal
SN - 2380-8195
VL - 7
SP - 993
EP - 1000
JO - ACS Energy Letters
JF - ACS Energy Letters
IS - 3
ER -
