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Article: Bimetallic Ag-Cu nanosheets assembled flower-like structure for oxygen reduction reaction

TitleBimetallic Ag-Cu nanosheets assembled flower-like structure for oxygen reduction reaction
Authors
KeywordsElectrocatalyst
Ag–Cu
Oxygen reduction reaction
SECM
DFT
Issue Date2021
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jallcom
Citation
Journal of Alloys and Compounds, 2021, v. 856, p. article no. 157379 How to Cite?
AbstractFabricating low-cost and Pt-free fuel cell catalysts towards highly active and durable oxygen-reduction reaction catalysis remains a great challenge. Herein, we synthesize a bimetallic Ag–Cu nanosheets assembled flower-like structure by our developed cyclic scanning electrodeposition (CSE) method. The formation mechanism of this structure is investigated systematically, where Cu2+ can affect oxidative etching during the formation process. The prepared bimetallic nanostructure is studied for kinetics towards oxygen reduction reaction (ORR) in alkaline media. The electrochemical test results indicate that the ORR catalytic ability of bimetallic Ag–Cu nanostructure is competitive with Pt/C-20%, better than Pt disk, and far superior to the pure Ag nanostructure. The electrons transfer number (n) is close to four, which is further proved by scanning electrochemical microscope (SECM) experiments. Density functional theory (DFT) calculations reveal that the high ORR activity is attributable to the widely distributed Ag–Cu steps, which is formed by decorating Cu atoms on the Ag nanosheets.
Persistent Identifierhttp://hdl.handle.net/10722/300675
ISSN
2023 Impact Factor: 5.8
2023 SCImago Journal Rankings: 1.103
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorCHEN, J-
dc.contributor.authorWANG, Z-
dc.contributor.authorMAO, J-
dc.contributor.authorLIU, C-
dc.contributor.authorChen, Y-
dc.contributor.authorLu, Z-
dc.contributor.authorFeng, SP-
dc.date.accessioned2021-06-18T14:55:23Z-
dc.date.available2021-06-18T14:55:23Z-
dc.date.issued2021-
dc.identifier.citationJournal of Alloys and Compounds, 2021, v. 856, p. article no. 157379-
dc.identifier.issn0925-8388-
dc.identifier.urihttp://hdl.handle.net/10722/300675-
dc.description.abstractFabricating low-cost and Pt-free fuel cell catalysts towards highly active and durable oxygen-reduction reaction catalysis remains a great challenge. Herein, we synthesize a bimetallic Ag–Cu nanosheets assembled flower-like structure by our developed cyclic scanning electrodeposition (CSE) method. The formation mechanism of this structure is investigated systematically, where Cu2+ can affect oxidative etching during the formation process. The prepared bimetallic nanostructure is studied for kinetics towards oxygen reduction reaction (ORR) in alkaline media. The electrochemical test results indicate that the ORR catalytic ability of bimetallic Ag–Cu nanostructure is competitive with Pt/C-20%, better than Pt disk, and far superior to the pure Ag nanostructure. The electrons transfer number (n) is close to four, which is further proved by scanning electrochemical microscope (SECM) experiments. Density functional theory (DFT) calculations reveal that the high ORR activity is attributable to the widely distributed Ag–Cu steps, which is formed by decorating Cu atoms on the Ag nanosheets.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jallcom-
dc.relation.ispartofJournal of Alloys and Compounds-
dc.subjectElectrocatalyst-
dc.subjectAg–Cu-
dc.subjectOxygen reduction reaction-
dc.subjectSECM-
dc.subjectDFT-
dc.titleBimetallic Ag-Cu nanosheets assembled flower-like structure for oxygen reduction reaction-
dc.typeArticle-
dc.identifier.emailChen, Y: yuechen@hku.hk-
dc.identifier.emailFeng, SP: hpfeng@hku.hk-
dc.identifier.authorityChen, Y=rp01925-
dc.identifier.authorityFeng, SP=rp01533-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jallcom.2020.157379-
dc.identifier.scopuseid_2-s2.0-85092617373-
dc.identifier.hkuros322976-
dc.identifier.volume856-
dc.identifier.spagearticle no. 157379-
dc.identifier.epagearticle no. 157379-
dc.identifier.isiWOS:000627309500030-
dc.publisher.placeNetherlands-

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