Perovskite-Type Solid Solution Nano-Electrocatalysts Enable Simultaneously Enhanced Activity and Stability for Oxygen Evolution

Advanced Materials
Xiao LiangXiaoxin Zou

Abstract

A trade-off between catalytic activity and structural stability generally exists in oxygen evolution electrocatalysis, especially in acidic environment. This dilemma limits the development of higher-performance electrocatalysts that are required by next-generation electrochemical technologies. Here it is demonstrated that the inverse catalytic activity-structural stability relation can be broken by alloying catalytically inert strontium zirconate with the other catalytically active perovskite, strontium iridate. This strategy results in an alloyed perovskite electrocatalyst with simultaneously improved iridium mass activity and structural stability, by about five times, for the oxygen evolution reaction under acidic conditions. The experimental and theoretical results suggest that the alloying strategy generates multiple positive effects, mainly including the reduction of catalyst size, the decrease of catalyst covalency, and the weakening of surface oxygen-binding ability. The synergistic optimization of bulk and surface properties, as a result, enhances the intrinsic activity and availability of surface iridium sites, whilst significantly inhibiting the surface cation corrosion during electrocatalysis.

References

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Citations

Oct 29, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Meihong FanXiaoxin Zou
Feb 6, 2021·Chemical Communications : Chem Comm·Weishi GuQingwen Zhou
Mar 11, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Yu LinYaqiong Gong
Mar 13, 2021·Advanced Materials·Shuai ZhangChun-Hua Yan

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