Iron-triggered exsolution of FeNi alloy nanoparticles via topotactic cation exchange on Pr0.7Sr0.3Cr0.9Ni0.1O3−δ perovskite for CO2 electrolysis
Houfu Lv,
Shuo Wang,
Yuxiang Shen,
Xiaomin Zhang,
Yuefeng Song,
Rongtan Li,
Na Ta,
Tianfu Liu,
Guoxiong Wang,
Xinhe Bao
Affiliations
Houfu Lv
State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China; Corresponding authors.
Shuo Wang
State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
Yuxiang Shen
State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China; University of Chinese Academy of Sciences, Beijing 100039, China
Xiaomin Zhang
State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
Yuefeng Song
State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
Rongtan Li
State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China; University of Chinese Academy of Sciences, Beijing 100039, China
Na Ta
State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
Tianfu Liu
State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
Guoxiong Wang
State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China; Corresponding authors.
Xinhe Bao
State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
Perovskites with in situ exsolved metal nanoparticles have been extensively studied for CO2 electrolysis in solid oxide electrolysis cell. However, exsolution process is strongly governed by the sluggish diffusion rate of cations and poor structural stability issues. Here we present a new exsolution process on redox stable Pr0.7Sr0.3Cr0.9Ni0.1O3−δ (PSCN) perovskite by topotactic exsolution. This process tends to generate host stoichiometric Pr0.7Sr0.3Cr0.9(FeNi)0.1O3−δ perovskite, triggering Ni cations segregation from the host while maintaining structural stability via supplement of Fe guest cations. The FeNi alloy nanoparticles decorated cathode showed a current density of 1.49 A cm−2 at 800 °C and 1.6 V for CO2 electrolysis, demonstrating over 62.0 % improvement compared to the primitive PSCN cathode. Experimental studies and density functional theory calculations revealed that the activity originated from the unique ability to adsorb and activate CO2 at the metal/perovskite interfaces. This cation supplement strategy may expand the frontiers in the evolution of exsolution on perovskite catalysts for CO2 utilization and other heterogeneous catalytic reactions.
