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Composite Cathode Based on Redox‐Reversible NbTi 0.5 Ni 0.5 O 4 Decorated with In Situ Grown Ni Particles for Direct Carbon Dioxide Electrolysis
Author(s) -
Xie K.,
Zhang J.,
Xu S.,
Ding B.,
Wu G.,
Xie T.,
Wu Y.
Publication year - 2014
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201400008
Subject(s) - materials science , cathode , electrolysis , electrochemistry , composite number , ceramic , redox , nickel , chemical engineering , carbon fibers , faraday efficiency , analytical chemistry (journal) , electrode , composite material , metallurgy , chemistry , electrolyte , engineering , chromatography
In this work, ceramic NbTi 0.5 Ni 0.5 O 4 is reversibly transformed to nickel‐anchored electronic‐conducting Nb 1.33 Ti 0.67 O 4 composite for the use of direct carbon dioxide electrolysis at intermediate temperatures. The reduced composites Nb 1.33 Ti 0.67 O 4 + Ni demonstrate excellent electrical properties, which have been accordingly correlated to electrochemical performance of the composite cathode. The direct electrolysis of 100% CO 2 is then performed and the maximum Faraday current efficiency reaches as high as 65%. It is found that adding 3% H 2 O to CO 2 remarkably improves the electrolysis performances and the current efficiency is accordingly enhanced by approximately 20%. The reversible transformation between NbTi 0.5 Ni 0.5 O 4 and Nb 1.33 Ti 0.67 O 4 + Ni sample significantly contributes to the promising thermal and redox cycling performance while the anchored interface between Ni and Nb 1.33 Ti 0.67 O 4 improves cathode stability.