pH dependent CO adsorption and roughness-induced selectivity of CO2 electroreduction on gold surfaces
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
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Title |
pH dependent CO adsorption and roughness-induced selectivity of CO2 electroreduction on gold surfaces
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Creator |
Narayanaru, S.
Chinnaiah, J. Phani, K.L.N. Scholz, F. |
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Subject |
Electrodics and Electrocatalysis
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Description |
Gold belongs to the category of metal electrocatalysts for CO2 reduction reaction (CO2RR) producing CO
as a major product due to its inability to bind CO. In this work, we found that when the interfacial pH
becomes alkaline, CO, the major product of CO2RR, interacts with gold surfaces to produce minor
products like formate and methanol. The course of product formation and CO adsorption on gold was
explored by their oxidative voltammetric responses obtained immediately after CO2RR in the forward
cathodic scan and SECM studies provided more insights into the effect of interfacial pH on product
selectivity. The electrode roughness was found to change the interfacial pH gradients as a result of
microheterogeneity of surfaces. The roughness of gold surface was systematically changed from
smoothened surface to nanoporous (highly rough) surface. NMR spectroscopic analysis pointed to the
presence of methanol and formate being formed on nanoporous Au (np- Au) in significant amounts.
Formate production was found increasing as a result of changes in the interfacial pH.
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Publisher |
Elsevier
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Date |
2018-01-31
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Type |
Article
PeerReviewed |
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Format |
application/pdf
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Identifier |
http://cecri.csircentral.net/3214/1/290-2018.pdf
Narayanaru, S. and Chinnaiah, J. and Phani, K.L.N. and Scholz, F. (2018) pH dependent CO adsorption and roughness-induced selectivity of CO2 electroreduction on gold surfaces. Electrochimica Acta, 264. pp. 269-274. ISSN 0013-4686 |
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Relation |
http://www.elsevier.com/locate/electacta
http://cecri.csircentral.net/3214/ |
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