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Electrocatalytic oxygen reduction performances of surface Ag granular packs electrodeposited from dual-phase Ag35.5Zn64.5 precursor alloys by triangle wave potential cycling

Surface Ag granular packs (SAgPs) have been fabricated from dual-phase Ag 35.5 Zn 64.5 precursor alloy consisting of both ε and γ phases by using a facile one-step triangle wave potential cycling in 0.5 mol·L −1 KOH. During the continuous potential cyclic sweeping, the γ phases preferentially dissol...

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Bibliographic Details
Published in:Rare metals 2021-12, Vol.40 (12), p.3531-3542
Main Authors: Luo, Jia-Yu, Han, Piao-Piao, Dan, Zhen-Hua, Tang, Tao, Qin, Feng-Xiang, Chang, Hui, Zhou, Lian
Format: Article
Language:English
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Summary:Surface Ag granular packs (SAgPs) have been fabricated from dual-phase Ag 35.5 Zn 64.5 precursor alloy consisting of both ε and γ phases by using a facile one-step triangle wave potential cycling in 0.5 mol·L −1 KOH. During the continuous potential cyclic sweeping, the γ phases preferentially dissolve during the anodic scan and dominant reduction reactions of Ag cations lead to redeposition and accumulation of Ag atoms together to form SAgPs during cathodic scan. The ε phases stay inactive to form a continuous skeleton in the inner regions. SAgPs with an average particle size of 94–129 nm can be obtained at scan rates of 25, 50 and 100 mV·s −1 for 100 triangle wave potential cycles. SAgPs formed at a scan rate of 50 mV·s −1 exhibit superior oxygen reduction reaction performances with the onset potential of 0.93 V, half-wave potential of 0.72 V and an electron transfer number of 4.0. The above-mentioned SAgPs have superior stabilities as ORR catalysts. Graphic abstract
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-020-01700-1