Chromate cathode decorated with in-situ growth of copper nanocatalyst for high temperature carbon dioxide electrolysis

Composite cathode based on La sub(0.75)Sr sub(0.25)Cr sub(0.5)Mn sub(0.5)O sub(3- delta ) (LSCM) can be used for direct carbon dioxide electrolysis without a flow of reducing gas over it in an oxide-ion-conducting solid oxide electrolyzer; however, the insufficient electro-catalytic activity of LSCM...

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Bibliographic Details
Published in:International journal of hydrogen energy 2014-12, Vol.39 (36), p.20888-20897
Main Authors: Li, Huaxin, Sun, Gehui, Xie, Kui, Qi, Wentao, Qin, Qingqing, Wei, Haoshan, Chen, Shigang, Wang, Yan, Zhang, Yong, Wu, Yucheng
Format: Article
Language:English
Subjects:
Alternative fuels. Production and utilization
Applied sciences
CARBON DIOXIDE
CATALYSTS
Cathodes
CHROMATES
Copper
Electrodes
ELECTROLYSIS
ELEVATED TEMPERATURE
Energy
Exact sciences and technology
Fuels
Hydrogen
MICROSTRUCTURES
Nanostructure
OXIDES
Surface chemistry
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Summary:Composite cathode based on La sub(0.75)Sr sub(0.25)Cr sub(0.5)Mn sub(0.5)O sub(3- delta ) (LSCM) can be used for direct carbon dioxide electrolysis without a flow of reducing gas over it in an oxide-ion-conducting solid oxide electrolyzer; however, the insufficient electro-catalytic activity of LSCM electrode still restricts electrode performance and Faraday current efficiency. In this work, catalytic-active copper nanoparticles are grown on the surface of LSCM cathode via in-situ exsolution of copper metal from A-site deficient and B-site excess (La sub(0.75)Sr sub(0.25)) sub(0.9)(Cr sub(0.5) Mn sub(0.5)) sub(0.9)Cu sub(0.1)O sub(3- delta ) (LSCMC) after reduction. XRD, SEM, EDS and XPS results together confirm the reversible exsolution of copper nanocatalyst on the surface of LSCM. Carbon dioxide adsorption/desorption of LSCM is investigated. The electrical properties of reduced LSCMC are investigated and correlated to the electrochemical performance of the composite electrodes. The current efficiencies of approximately 85% are obtained with LSCM cathode decorated with copper nanocatalyst for direct carbon dioxide electrolysis in an oxide-ion-conducting solid oxide electrolyzer.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2014.10.053