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Activating Copper for Electrocatalytic CO2 Reduction to Formate via Molecular Interactions
journal contribution
posted on 2020-08-05, 06:29 authored by Zixu Tao, Zishan Wu, Yueshen Wu, Hailiang WangCu is a well-known
electrocatalyst for reducing CO2 to
various products. However, unmodified Cu exhibits poor selectivity
and activity for formate production. Our in situ Raman spectroscopy
study detects HCOO* intermediates on the unmodified Cu surface under
CO2 electroreduction reaction conditions and confirms their
reductive desorption being the rate-limiting step of producing formate.
We further show that cetyltrimethylammonium bromide (CTAB) can dramatically
improve the catalysis via competitive adsorption to facilitate HCOO*
desorption. The Cu–CTAB interaction leads to a faradic efficiency
of 82% and a 56-fold increase in partial current density for CO2 reduction to formate at −0.5 V vs the reversible hydrogen
electrode in a near-neutral aqueous solution, which is the best performance
to date for unmodified Cu under ambient conditions.
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ambient conditionsCTABcetyltrimethylammonium bromideCu exhibitsCO 2 reductionMolecular Interactions Cuformate productionCO 2 electroreduction reaction cond...Electrocatalytic CO 2 Reductionreductive desorptionhydrogen electrodeCu surfaceActivating CopperHCOORaman spectroscopy studyrate-limiting stepCO 2faradic efficiency
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