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The role of oxygen vacancies in water oxidation for perovskite cobalt oxide electrocatalysts: are more better?

Author:
Miao, Xianbing, Wu, Liang, Lin, Yue, Yuan, Xueyou, Zhao, Jiyin, Yan, Wensheng, Zhou, Shiming, Shi, Lei
Source:
Chemical communications 2019 v.55 no.10 pp. 1442-1445
ISSN:
1364-548X
Subject:
chemical communication, cobalt, cobalt oxide, ions, oxidation, oxygen, oxygen production
Abstract:
We explore the role of oxygen vacancies in the oxygen evolution reaction (OER) for double perovskite PrBaCo₂O₆₋δ. Interestingly, we find that largely increasing oxygen vacancies leads to a significant reduction in the intrinsic OER activity. Structural studies reveal that oxygen vacancies tend to orderly align in PrO₁₋δ. This ordered structure not only lowers the cobalt oxidation states but also triggers a spin-state transition from high-spin to low-spin states for cobalt ions, both greatly slowing the OER kinetics.
Agid:
6287768