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Highly Active and Durable Cu(x)Au((1–x)) Ultrathin-Film Catalysts for Nitrate Electroreduction Synthesized by Surface-Limited Redox Replacement

[Image: see text] Cu(x)Au((1–x)) bimetallic ultrathin-film catalysts for nitrate electroreduction have been synthesized using electrochemical atomic layer deposition by surface-limited redox replacement of Pb underpotentially deposited layer. Controlled by the ratio of [Cu(2+)] ions and [AuCl(4)(–)]...

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Autores principales: Xie, Yunxiang, Dimitrov, Nikolay
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2018
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6643547/
https://www.ncbi.nlm.nih.gov/pubmed/31458367
http://dx.doi.org/10.1021/acsomega.8b02148
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author Xie, Yunxiang
Dimitrov, Nikolay
author_facet Xie, Yunxiang
Dimitrov, Nikolay
author_sort Xie, Yunxiang
collection PubMed
description [Image: see text] Cu(x)Au((1–x)) bimetallic ultrathin-film catalysts for nitrate electroreduction have been synthesized using electrochemical atomic layer deposition by surface-limited redox replacement of Pb underpotentially deposited layer. Controlled by the ratio of [Cu(2+)] ions and [AuCl(4)(–)] complex in the deposition solution, the alloy film composition (atomic fraction, x in the range of 0.5–1) has been determined by X-ray photoelectron spectroscopy and indirectly estimated by anodic stripping voltammetry. The catalytic activity and durability of Cu(x)Au((1–x)) thin films, Cu thin film, and bulk Cu have been studied by one- and multiple-cycle voltammetry. The synthesized Cu(x)Au((1–x)) thin films feature up to two times higher nitrate electroreduction activity in acidic solution compared to bulk and thin-film Cu counterparts. Highest activity has been measured with a Cu(0.70)Au(0.30) catalyst. Durability tests have demonstrated that Cu thin films undergo rapid deactivation losing 65% of its peak activity for 92 cycles, whereas Cu(0.70)Au(0.30) catalysts lose only 45% of their top performance. The significantly better durability of alloy films can be attributed to effective resistance to poisoning and/or hindered dissolution of Cu active centers. It has been also found that both Cu(x)Au((1–x)) and pure Cu thin films show best electroreduction activity at lowest pH.
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spelling pubmed-66435472019-08-27 Highly Active and Durable Cu(x)Au((1–x)) Ultrathin-Film Catalysts for Nitrate Electroreduction Synthesized by Surface-Limited Redox Replacement Xie, Yunxiang Dimitrov, Nikolay ACS Omega [Image: see text] Cu(x)Au((1–x)) bimetallic ultrathin-film catalysts for nitrate electroreduction have been synthesized using electrochemical atomic layer deposition by surface-limited redox replacement of Pb underpotentially deposited layer. Controlled by the ratio of [Cu(2+)] ions and [AuCl(4)(–)] complex in the deposition solution, the alloy film composition (atomic fraction, x in the range of 0.5–1) has been determined by X-ray photoelectron spectroscopy and indirectly estimated by anodic stripping voltammetry. The catalytic activity and durability of Cu(x)Au((1–x)) thin films, Cu thin film, and bulk Cu have been studied by one- and multiple-cycle voltammetry. The synthesized Cu(x)Au((1–x)) thin films feature up to two times higher nitrate electroreduction activity in acidic solution compared to bulk and thin-film Cu counterparts. Highest activity has been measured with a Cu(0.70)Au(0.30) catalyst. Durability tests have demonstrated that Cu thin films undergo rapid deactivation losing 65% of its peak activity for 92 cycles, whereas Cu(0.70)Au(0.30) catalysts lose only 45% of their top performance. The significantly better durability of alloy films can be attributed to effective resistance to poisoning and/or hindered dissolution of Cu active centers. It has been also found that both Cu(x)Au((1–x)) and pure Cu thin films show best electroreduction activity at lowest pH. American Chemical Society 2018-12-18 /pmc/articles/PMC6643547/ /pubmed/31458367 http://dx.doi.org/10.1021/acsomega.8b02148 Text en Copyright © 2018 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
spellingShingle Xie, Yunxiang
Dimitrov, Nikolay
Highly Active and Durable Cu(x)Au((1–x)) Ultrathin-Film Catalysts for Nitrate Electroreduction Synthesized by Surface-Limited Redox Replacement
title Highly Active and Durable Cu(x)Au((1–x)) Ultrathin-Film Catalysts for Nitrate Electroreduction Synthesized by Surface-Limited Redox Replacement
title_full Highly Active and Durable Cu(x)Au((1–x)) Ultrathin-Film Catalysts for Nitrate Electroreduction Synthesized by Surface-Limited Redox Replacement
title_fullStr Highly Active and Durable Cu(x)Au((1–x)) Ultrathin-Film Catalysts for Nitrate Electroreduction Synthesized by Surface-Limited Redox Replacement
title_full_unstemmed Highly Active and Durable Cu(x)Au((1–x)) Ultrathin-Film Catalysts for Nitrate Electroreduction Synthesized by Surface-Limited Redox Replacement
title_short Highly Active and Durable Cu(x)Au((1–x)) Ultrathin-Film Catalysts for Nitrate Electroreduction Synthesized by Surface-Limited Redox Replacement
title_sort highly active and durable cu(x)au((1–x)) ultrathin-film catalysts for nitrate electroreduction synthesized by surface-limited redox replacement
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6643547/
https://www.ncbi.nlm.nih.gov/pubmed/31458367
http://dx.doi.org/10.1021/acsomega.8b02148
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