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Highly Efficient Silver-Cobalt Composite Nanotube Electrocatalysts for Favorable Oxygen Reduction Reaction

Title
Highly Efficient Silver-Cobalt Composite Nanotube Electrocatalysts for Favorable Oxygen Reduction Reaction
Authors
Yu A.Lee C.Lee N.-S.Kim M.H.Lee Y.
Ewha Authors
이종목이영미김명화
SCOPUS Author ID
이종목scopus; 이영미scopus; 김명화scopus
Issue Date
2016
Journal Title
ACS Applied Materials and Interfaces
ISSN
1944-8244JCR Link
Citation
vol. 8, no. 48, pp. 32833 - 32841
Keywords
bimetallic nanotubescobaltelectrocatalystelectrospinningoxygen reduction reactionsilver
Publisher
American Chemical Society
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
This paper reports the synthesis and characterization of silver-cobalt (AgCo) bimetallic composite nanotubes. Cobalt oxide (Co3O4) nanotubes were fabricated by electrospinning and subsequent calcination in air and then reduced to cobalt (Co) metal nanotubes via further calcination under a H2/Ar atmosphere. As-prepared Co nanotubes were then employed as templates for the following galvanic replacement reaction (GRR) with silver (Ag) precursor (AgNO3), which produced AgCo composite nanotubes. Various AgCo nanotubes were readily synthesized with applying different reaction times for the reduction of Co3O4 nanotubes and GRR. One hour reduction was sufficiently long to convert Co3O4 to Co metal, and 3 h GRR was enough to deposit Ag layer on Co nanotubes. The tube morphology and copresence of Ag and Co in AgCo composite nanotubes were confirmed with SEM, HRTEM, XPS, and XRD analyses. Electroactivity of as-prepared AgCo composite nanotubes was characterized for ORR with rotating disk electrode (RDE) voltammetry. Among differently synthesized AgCo composite nanotubes, the one synthesized via 1 h reduction and 3 h GRR showed the best ORR activity (the most positive onset potential, greatest limiting current density, and highest number of electrons transferred). Furthermore, the ORR performance of the optimized AgCo composite nanotubes was superior compared to pure Co nanotubes, pure Ag nanowires, and bare platinum (Pt). High ethanol tolerance of AgCo composite nanotubes was also compared with the commercial Pt/C and then verified its excellent resistance to ethanol contamination. © 2016 American Chemical Society.
DOI
10.1021/acsami.6b11073
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자연과학대학 > 화학·나노과학전공 > Journal papers
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