B-Site Cation Ordered Double Perovskites as Efficient and Stable Electrocatalysts for Oxygen Evolution Reaction

摘要

Simple disordered perovskite oxides have been intensively exploited as promising electrocatalysts for the oxygen evolution reaction (OER) towards their application in water splitting, reversible fuel cells, and rechargeable metalair batteries. Here, the B-site cation-ordered double perovskites Ba_2Bi_xSc_(0.2)Co_(1.8-x)O_(6-δ), with two types of cobalt local environments, are demonstrated to be superior electrocatalysts for OER in alkaline solution, demonstrating ultrahigh catalytic activity. In addition, no obvious performance degradation is observed for the Ba_2Bi_(0.1)Sc_(0.2)Co_(1.7)O_(6-δ) sample after a continuous chronopotentiometry test. The critical role of the ordered [Co~(2+)] and [Sc~(3+), Bi~(5+), Co~(3+)] dual environments in improving OER activity is exhibited. These results indicate that B-site cation-ordered double perovskite oxides may represent a new class of promising electrocatalysts for the OER in sustainable energy storage and conversion systems.