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In-situ growth of metallic Ag0 intercalated CoAl layered double hydroxides as an efficient electrocatalyst for oxygen reduction reaction in alkaline solution

Abstract

Metallic Ag0 intercalated CoAl-layered double hydroxides (CoAl LDHs) has been successfully in situ synthesized through a simple redox process assisted by ethylene glycol (EG) and triethanolamine (TEOA). The Ag(CN)2- anion-exchanged precursor was reduced by EG to form metallic Ag0. Furthermore, the effect of TEOA was demonstrated on confining the particle size of Ag0. The oxygen reduction reaction (ORR) property of metallic Ag0 intercalated CoAl LDHs was performed in alkaline aqueous solution. The typical sample synthesized with the addition of TEOA for 180 min exhibited an excellent ORR catalytic activity with a high current density of 5.5 mA cm-2 at 0.2 V (vs. RHE) and good stability. Koutecky-Levich (K-L) calculation and rotating ring-disk electrode (RRDE) measurement further revealed that the ORR of the as-prepared catalyst proceeded mainly via an almost ideal four-electron transfer process. The enhanced electrocatalytic activity was ascribed to the intercalated Ag0, confined nanoparticle size and expanded interlayer space, which effectively facilitate the reactant transfer and electron migration.

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Publication details

The article was received on 21 Nov 2018, accepted on 06 Dec 2018 and first published on 07 Dec 2018


Article type: Paper
DOI: 10.1039/C8DT04610G
Citation: Dalton Trans., 2018, Accepted Manuscript
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    In-situ growth of metallic Ag0 intercalated CoAl layered double hydroxides as an efficient electrocatalyst for oxygen reduction reaction in alkaline solution

    X. Deng, J. Huang, F. Chen, H. Wan, Y. Lin, X. Xu, R. Ma and T. Sasaki, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT04610G

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