催化作用
材料科学
电化学
电催化剂
钙钛矿(结构)
氧还原反应
无机化学
浸出(土壤学)
贵金属
化学工程
金属
纳米技术
化学
电极
冶金
物理化学
有机化学
环境科学
工程类
土壤科学
土壤水分
作者
Qun Li,Di Zhang,Jiabin Wu,Simin Dai,Heng Liu,Min Lu,Ruyong Cui,Wenxi Liang,Dingsheng Wang,Pinxian Xi,Meilin Liu,Hao Li,Liang Huang
标识
DOI:10.1002/adma.202309266
摘要
Abstract Many perovskite oxides (ABO 3 ) are considered the most promising alternatives to noble metal catalysts for oxygen reduction reaction (ORR) due to their high intrinsic activities. However, their electrocatalytic performance is often limited by poor electrical conductivity and low specific surface area. Here an electrochemically induced calcium‐leaching process is reported to greatly increase the electrochemical surface area (ECSA) of La 0.6 Ca 0.4 MnO 3 (LCMO64). The ECSA of the activated, Ca‐deficient LCMO64 is ≈33.84% higher than that of the unactivated materials, demonstrating superior electrocatalytic ORR performance to the benchmark commercial Pt/C catalyst in an alkaline solution. Theoretical analysis coupled with electrochemical surface state probing and pH‐dependent microkinetic modeling suggests that this catalyst with the identified most favorable state under ORR operating conditions reaches the Sabatier optimum of alkaline ORR. This reconstructed LCMO64 is among the best‐performing ORR catalysts ever reported, providing new insights into the design of advanced perovskite materials with optimal surface chemistry.
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