Pulsed electrodeposition of CO{sub 2} on silver electrodes
- Kyushu Inst. of Tech., Kitakyushu (Japan). Dept. of Electrical Engineering
A large degree of selectivity of reduction products of CO{sub 2} has been achieved on Ag electrodes by a pulsed technique in which the anodic (V{sub a}) and the cathodic (V{sub c}) bias were found to be key parameters. The maximum faradaic efficiencies for CO, CH{sub 4}, C{sub 2}H{sub 4}, and C{sub 2}H{sub 5}OH were, respectively, 70% (V{sub c} = {minus}2.0 V, V{sub a} = {minus}0.125 V), 55% ({minus}2l25 V, {minus}0.4 V), 3.1% ({minus}2.25 V, {minus}0.4 V), 3.1% ({minus}2.25 V, {minus}0.4 V), and 22% ({minus}2.25 V, {minus}0.5 V). The total value of 58.1% for CH{sub 4} and C{sub 2}H{sub 4} formation recorded on the Ag electrode is comparable with that for CH{sub 4} and C{sub 2}H{sub 4} formation on the Cu electrode, which has long been considered as a unique metal for CH{sub 4} and C{sub 2}H{sub 4} formation. In addition, in the potential range where CH{sub 4} and C{sub 2}H{sub 4} are preferentially produced, the formation of HCOOH was found to be almost zero. The selectivity was ascribed to be due to the extent of the surface coverage of adsorbed hydrogen, which can be controlled by the anodic bias.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 212162
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 2 Vol. 143; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
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