Robust tantalum tuned perovskite oxygen electrode for reversible protonic ceramic electrochemical cells  

作　　者：Yu-Shi Feng Yu Shen Fang Wang Chuan Tian Qin-Yi Hu Qian Duan Jing-Wei Li Di Bao 

机构地区：[1]School of Materials Science and Engineering,Changchun University of Science and Technology,Changchun 130022,China [2]Zhongshan Institute of Changchun University of Science and Technology,Zhongshan528437,China [3]State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry Chinese Academy of Sciences,Changchun 130022,China [4]Key Laboratory of Preparation and Applications of Environmental Friendly Materials,Ministry of Education,Jilin Normal University,Changchun 130103,China

出　　处：《Rare Metals》2024年第7期3055-3065,共11页稀有金属（英文版）

基　　金：financially supported by the National Key R&D Program of China(No.2022YFB4002201);the National Natural Science Foundation of China(Nos.52072362 and 52302119);Jilin Province Science and Technology Development Plan Funding Project(Nos.SKL202302039 and 20220201112GX);Jiangsu Province Innovation Support Program(No.BE2023092-2);Youth Innovation Promotion Association CAS(No.2021223);Open Funds of the State Key Laboratory of Rare Earth Resource Utilization(No.RERU2022008)。

摘　　要：Perovskite oxides with diverse composition and structure have exhibited grand advances in boosting the oxygen reduction and evolution reaction(ORR/OER),which are essential for the reversible protonic ceramic electrochemical cell(R-PCEC)toward the sustainable hydrogen production and utilization.However,enhancement of their activity and stability remains challenging.Herein,we develop the Ta-regulated BaCo_(0.7)Fe_(0.3)O_(3-δ)perovskite oxygen electrode(Ba(Co_(0.7)Fe_(0.3))_(1-x)Ta_xO_(3-δ))with abundant oxygen defects and achieve the simultaneous enhancement in the electrocatalytic activity and stability toward ORR and OER.As-fabricated R-PCEC with(Ba(Co_(0.7)Fe_(0.3))_(0.9)Ta_(0.1)O_(3-δ))(BCFT10)oxygen electrode performs high power density of 1.47 W·cm^(-2)at 650℃in fuel cell mode,and the current density is up to-2.11 A·cm^(-2)at 1.4 V at 650℃in electrolysis mode,as well as the good stability in both the fuel cell and electrolysis modes.Importantly,the cell also demonstrates a stable cycling operation between fuel cell and electrolysis mode,suggesting a great potential of BCFT10 as oxygen electrode material for R-PCECs.

关 键 词：Reversible protonic ceramic electrochemical cells Perovskite oxide Oxygen electrode Ta element doping Oxygen defects 

分 类 号：TQ116.2[化学工程—无机化工] TB34[一般工业技术—材料科学与工程] TM91[电气工程—电力电子与电力传动]