Rational Design of Ruddlesden-Popper Perovskite Ferrites as Air Electrode for Highly Active and Durable Reversible Protonic Ceramic Cells  

作　　者：Na Yu Idris Temitope Bello Xi Chen Tong Liu Zheng Li Yufei Song Meng Ni 

机构地区：[1]Department of Building and Real Estate,Research Institute for Sustainable Urban Development(RISUD)and Research Institute for Smart Energy(RISE),The Hong Kong Polytechnic University,Hung Hom,Kowloon,Hong Kong,People’s Republic of China [2]The Hong Kong Polytechnic University Shenzhen Research Institute,Shenzhen 518057,Guangdong,People’s Republic of China [3]Department of Mechanical and Aerospace Engineering,The Hong Kong University of Science and Technology,Clear Water Bay,Hong Kong,People’s Republic of China

出　　处：《Nano-Micro Letters》2024年第9期308-324,共17页纳微快报（英文版）

基　　金：supported by the Research Grants Council,University Grants Committee,Hong Kong SAR(Project Number:N_PolyU552/20);supported by the National Nature Science Foundation of China(22209138);Guangdong Basic and Applied Basic Research Foundation(2021A1515110464).

摘　　要：Reversible protonic ceramic cells(RePCCs)hold promise for efficient energy storage,but their practicality is hindered by a lack of high-performance air electrode materials.Ruddlesden-Popper perovskite Sr_(3)Fe_(2)O_(7−δ)(SF)exhibits superior proton uptake and rapid ionic conduction,boosting activity.However,excessive proton uptake during RePCC operation degrades SF’s crystal structure,impacting durability.This study introduces a novel A/B-sites co-substitution strategy for modifying air electrodes,incorporating Sr-deficiency and Nb-substitution to create Sr_(2.8)Fe_(1.8)Nb_(0.2)O_(7−δ)(D-SFN).Nb stabilizes SF’s crystal,curbing excessive phase formation,and Sr-deficiency boosts oxygen vacancy concentration,optimizing oxygen transport.The D-SFN electrode demonstrates outstanding activity and durability,achieving a peak power density of 596 mW cm^(−2)in fuel cell mode and a current density of−1.19 A cm^(−2)in electrolysis mode at 1.3 V,650℃,with excellent cycling durability.This approach holds the potential for advancing robust and efficient air electrodes in RePCCs for renewable energy storage.

关 键 词：Reversible protonic ceramic cells Air electrode Ruddlesden-Popper perovskite HYDRATION Oxygen reduction reaction 

分 类 号：TM91[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程] O646[理学—物理化学]