氧空位在钙钛矿钴氧化物电催化剂水氧化中的作用：更多是否更好？
The role of oxygen vacancies in water oxidation for perovskite cobalt oxide electrocatalysts: are more better?
机构信息
Hefei National Laboratory for Physics Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
出版信息
Chem Commun (Camb). 2019 Jan 29;55(10):1442-1445. doi: 10.1039/c8cc08817a.
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.
我们探究了双钙钛矿 PrBaCo2O6-δ 中氧空位在氧析出反应（OER）中的作用。有趣的是，我们发现大量增加氧空位会显著降低其本征 OER 活性。结构研究表明，氧空位倾向于在 PrO1-δ 中有序排列。这种有序结构不仅降低了钴的氧化态，还引发了钴离子从高自旋态到低自旋态的自旋态转变，这两个因素都极大地减缓了 OER 动力学。
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