Simultaneous Electrocatalytic CO2 Reduction and Enhanced Electrochromic Effect at WO3 Nanostructured Electrodes in Acetonitrile

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Title: Simultaneous Electrocatalytic CO2 Reduction and Enhanced Electrochromic Effect at WO3 Nanostructured Electrodes in Acetonitrile
Authors: Mendieta-Reyes, Néstor E. | Díaz-García, Ana Korina | Gómez, Roberto
Research Group/s: Grupo de Fotoquímica y Electroquímica de Semiconductores (GFES)
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: CO2 reduction | CO2 activation | Electrochromic effect | Spectroelectrochemistry | Electrodissolution | WO3 electrodes
Knowledge Area: Química Física
Issue Date: 12-Jan-2018
Publisher: American Chemical Society
Citation: ACS Catalysis. 2018, 8(3): 1903-1912. doi:10.1021/acscatal.7b03047
Abstract: Serious concerns about climate change make the reutilization of CO2 particularly attractive; one option for reutilization is the electroreduction of CO2 in acetonitrile solutions on a range of electrode materials. Among them, transition-metal oxides stand out as cost-effective alternatives. In this context, the electrocatalytic activity of nanostructured WO3 electrodes for carbon dioxide reduction in both humid and dry acetonitrile media has been addressed by using electrochemical and spectroelectrochemical measurements. Importantly the cathodic faradaic process starts at potentials as high as −0.16 V vs SHE. Gas chromatography measurements show CO as being the main product in both dry and humid acetonitrile, together with formate in the presence of humidity. Interestingly, purging with CO2 causes not only the appearance of cathodic faradaic currents but also an increase in capacitive currents, which are directly associated with an enhanced electrochromic effect. The ICP-MS determination of tungsten upon electrolysis confirms a minor electrodissolution of WO3 electrodes. On the basis of these observations, a mechanism is proposed in which WO3 is not only the electrode material but also a mediator in the CO2 reduction process.
Sponsor: We are grateful for the financial support of MINECO through project MAT2015-71727-R (FONDOS FEDER). N.E.M.R. acknowledges COLCIENCIAS National Doctoral Scholarship (567) and the Vicerrectorado de Investigación y Transferencia del Conocimiento de la Universidad de Alicante, and A.K.D.-G. thanks the Mexican government (CONACYT) for the award of a doctoral grant.
ISSN: 2155-5435
DOI: 10.1021/acscatal.7b03047
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2018 American Chemical Society
Peer Review: si
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Appears in Collections:INV - GFES - Artículos de Revistas

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