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Research Article

Promoting catalysis activity with optimizable self-generated Co-Fe alloy nanoparticles for efficient CO2 electrolysis performance upgrade

Kun Zhang1,§, Dong Zhang1,§, Yao Wang1( ), Yihang Li3, Cong Ren4, Mingyue Ding1( ), Tong Liu2( )
Key Laboratory of Hydraulic Machinery Transients (Wuhan University), Ministry of Education, School of Power and Mechanical Engineering, The Institute of Technological Sciences, Wuhan University, Wuhan 430072, China
Key Laboratory of Green Chemical Process of Ministry of Education, Hubei Key Laboratory of Novel Reactor and Green Chemical Technology, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
Interdisciplinary Research Center of Smart Sensors, Academy of Advanced Interdisciplinary Research, Xidian University, Xi’an 710071, China
Department of Applied Chemistry, School of Advanced Materials and Nanotechnology, Xidian University, Xi’an 710071, China

§ Kun Zhang and Dong Zhang contributed equally to this work.

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Graphical Abstract

Perovskite oxide with transition metal elements such as cobalt and iron can be transformed to Ruddlesden–Popper (R-P) phase and metallic phase in the reducing atmosphere via the in-situ exsolution technique, and the in-situ exsolved metallic nano-catalysts can greatly promote the carbon dioxide reduction reaction. Moreover, the electrochemical performance can be effectively re-generated and even enhanced by re-oxidizing in air.

Abstract

Stable and flexible metal nanoparticles (NPs) with regeneration ability are critical for long-term operation of solid oxide electrolysis cells (SOECs). Herein, a novel perovskite electrode with stoichiometric Pr0.4Sr0.6Co0.125Fe0.75Mo0.125O3−δ (PSFCM) is synthesized and studied, which undergoes multiple redox cycles to validate its structural stability and NPs reversibility. The Co-Fe alloy has exsolved from the parent bulk under reducing atmosphere, and is capable of reincorporation into the parent oxide after re-oxidation treatment. During the redox process, we successfully manipulate the size and population density of the exsolved NPs, and find that the average particle size significantly reduces but the population density increases correspondingly. The electrode polarization resistance of the symmetric cell remains stable for 450 h, and even activates after the redox cycling, which may be attributed to the higher quantity and larger specific surface area of the regenerated Co-Fe alloy NPs. Moreover, the electrochemical performance towards carbon dioxide reduction reaction (CO2RR) is evaluated, and the CO2 electrolyzer consisting of CoFe@PSCFM-Ce0.8Sm0.2O1.9 (SDC) dual-phase electrode exhibits an excellent current density of 1.42 A·cm−2 at 1.6 V, which reaches 1.7 times higher than 0.83 A·cm−2 for the pristine PSCFM electrode. Overall, with this flexible and reversible high-performance SOEC cathode material, new options and perspectives are provided for the efficient and durable CO2 electrolysis.

Keywords

redox stabilityin situ exsolutionregenerationcarbon dioxide reduction reactionperovskite

Electronic Supplementary Material

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Nano Research
Volume 16 Issue 8,
August 2023
Pages 10992-10999
DOI: 10.1007/s12274-023-5860-2
Cite this article:
Zhang K, Zhang D, Wang Y, et al. Promoting catalysis activity with optimizable self-generated Co-Fe alloy nanoparticles for efficient CO2 electrolysis performance upgrade. Nano Research, 2023, 16(8): 10992-10999. https://doi.org/10.1007/s12274-023-5860-2
Topics:
ElectrocatalystsFuel cells

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Received: 03 April 2023
Revised: 10 May 2023
Accepted: 21 May 2023
Published: 12 July 2023
© Tsinghua University Press 2023
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