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Volume 210, 2018
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Ligament size-dependent electrocatalytic activity of nanoporous Ag network for CO2 reduction

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Abstract

Electrochemical CO2 reduction (ECR) depends significantly on the nanostructures of electrocatalysts. Here we show a nanoporous Ag network catalyst (np-Ag) for efficient electrochemical reduction of CO2. The np-Ag samples with an average ligament size of 21 nm (denoted by np-Ag (21 nm)) and 87 nm (denoted by np-Ag (87 nm)) were fabricated by dealloying the rapidly solidified Mg80Ag20 (wt%) alloy ribbons in 1 wt% citric acid and 5 wt% phosphoric acid, respectively. The ligament size effect on the electrocatalytic activity and selectivity of CO2 conversion into CO is investigated. When catalysing CO2 reduction in 0.1 M KHCO3, the np-Ag (21 nm) catalyst exhibits a significantly enhanced selectivity with a faradaic efficiency for CO formation of 85.0% at −0.8 V versus RHE, about two times that (41.2%) over the np-Ag (87 nm). Additionally, a superior catalytic activity is also achieved over the np-Ag (21 nm), with a >2.5-fold increase in the CO partial current density relative to the np-Ag (87 nm). The improved selectivity and activity of np-Ag (21 nm) are attributed to the enhanced electrochemical surface area, higher local pH derived from ligament size effect, as well as more defect sites (i.e., grain boundaries) in ligaments.

Graphical abstract: Ligament size-dependent electrocatalytic activity of nanoporous Ag network for CO2 reduction

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Publication details

The article was received on 05 Mar 2018, accepted on 16 Mar 2018 and first published on 17 Mar 2018


Article type: Paper
DOI: 10.1039/C8FD00056E
Citation: Faraday Discuss., 2018,210, 289-299
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    Ligament size-dependent electrocatalytic activity of nanoporous Ag network for CO2 reduction

    W. Yang, W. Ma, Z. Zhang and C. Zhao, Faraday Discuss., 2018, 210, 289
    DOI: 10.1039/C8FD00056E

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