Tailoring Ion Ordering in Perovskite Oxide for High‐Temperature Oxygen Evolution Reaction
Qingxue Liu, Feiran Shen, Guohui Song, Tianfu Liu, Weicheng Feng, Rongtan Li, Xiaomin Zhang, Mingrun Li, Lunhua He, Xu Zheng, Shuaishuai Yin, Guangzhi Yin, Yuefeng Song, Guoxiong Wang, Xinhe Bao
Abstract
Abstract Perovskites exhibit excellent high‐temperature oxygen evolution reaction (OER) activities as the anodes of solid oxide electrolysis cells (SOECs). However, the relationship between ion ordering and OER performances is rarely investigated. Herein, a series of PrBaCo 2− x Fe x O 5+ δ perovskites with tailored ion orderings are constructed. Physicochemical characterizations and density functional theory calculations confirm that the oxygen bulk migration and surface transport capacities as well as the OER activities are promoted by the A‐site cation ordering, but weakened by the oxygen vacancy ordering. Hence, SOEC with the A‐site‐ordered and oxygen‐vacancy‐disordered PrBaCo 2 O 5+ δ anode exhibits the highest performance of 3.40 A cm −2 at 800 °C and 2.0 V. This work sheds light on the critical role of ion orderings in the high‐temperature OER performance and paves a new way for screening novel anode materials of SOECs.