Enhanced Stability and CO/Formate Selectivity of Plasma-Treated SnOx/AgOx Catalysts during CO2 Electroreduction | Zendy

YongWook Choi | Zendy; Fabian Scholten | Zendy; Ilya Sinev | Zendy; Beatriz Roldán Cuenya | Zendy

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Enhanced Stability and CO/Formate Selectivity of Plasma-Treated SnO_x/AgO_x Catalysts during CO₂ Electroreduction

Author(s) -

YongWook Choi,

Fabian Scholten,

Ilya Sinev,

Beatriz Roldán Cuenya

Publication year - 2019

Publication title -

journal of the american chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 7.115

H-Index - 612

eISSN - 1520-5126

pISSN - 0002-7863

DOI - 10.1021/jacs.8b12766

Subject(s) - overpotential , x ray photoelectron spectroscopy , chemistry , xanes , formate , faraday efficiency , electrocatalyst , catalysis , selectivity , methyl formate , reversible hydrogen electrode , chemical state , spectroscopy , analytical chemistry (journal) , inorganic chemistry , chemical engineering , electrode , electrochemistry , organic chemistry , working electrode , physics , quantum mechanics , engineering

CO 2 electroreduction into useful chemicals and fuels is a promising technology that might be used to minimize the impact that the increasing industrial CO 2 emissions are having on the environment. Although plasma-oxidized silver surfaces were found to display a considerably decreased overpotential for the production of CO, the hydrogen evolution reaction (HER), a competing reaction against CO 2 reduction, was found to increase over time. More stable and C1-product-selective SnO x /AgO x catalysts were obtained by electrodepositing Sn on O 2 -plasma-pretreated Ag surfaces. In particular, a strong suppression of HER (below 5% Faradaic efficiency (FE) at -0.8 V vs the reversible hydrogen electrode, RHE) during 20 h was observed. Ex situ scanning electron microscopy (SEM) combined with energy-dispersive X-ray spectroscopy (EDS), quasi in situ X-ray photoelectron spectroscopy (XPS), and operando X-ray absorption near-edge structure spectroscopy (XANES) measurements showed that our synthesis led to a highly roughened surface containing stable Sn δ+ /Sn species that were found to be key in the enhanced activity and stable CO/formate (HCOO - ) selectivity. Our study highlights the importance of roughness, composition, and chemical state effects in CO 2 electrocatalysis.

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