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Issue 40, 2018
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Selective CO2 electroreduction over an oxide-derived gallium catalyst

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The electrochemical CO2 reduction reaction (CO2RR) powered by renewable electricity has emerged as a promising approach to alleviate global warming and energy depletion simultaneously. Notably, efficient catalysts containing Earth-abundant elements to achieve high CO2RR performance are in great demand for future applications. Herein, carbon-supported gallia gel nanoparticles were synthesized by precipitating gallium nitrate on carbon black in an ethanolic ammonia solution. Nano-sized gallia nanoparticles uniformly dispersed on the carbon support achieved a maximum CO faradaic efficiency of 77.0% at −0.71 V vs. the reversible hydrogen electrode (RHE) in CO2-saturated 0.1 M KHCO3 solution, showing a dramatic improvement compared to a bulk Ga electrode with only 24.2% CO faradaic efficiency at −0.80 V vs. RHE. X-ray photoelectron spectroscopy measurements revealed that surface Ga3+ species were reduced to metallic Ga when subjected to a negative potential during the CO2RR, indicative of the formation of oxide-derived active gallium sites. Control experiments further highlighted the necessity of close coalescence between the nano-sized gallia particles and the conductive carbon support. The present study underscores the feasibility of improving the CO2RR performance of Ga-related materials through nanostructuring of oxide-derived gallium catalysts.

Graphical abstract: Selective CO2 electroreduction over an oxide-derived gallium catalyst

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The article was received on 05 Sep 2018, accepted on 25 Sep 2018 and first published on 26 Sep 2018

Article type: Paper
DOI: 10.1039/C8TA08613C
J. Mater. Chem. A, 2018,6, 19743-19749

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    Selective CO2 electroreduction over an oxide-derived gallium catalyst

    C. Yan, L. Lin, D. Gao, G. Wang and X. Bao, J. Mater. Chem. A, 2018, 6, 19743
    DOI: 10.1039/C8TA08613C

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