CdS‐Enhanced Ethanol Selectivity in Electrocatalytic CO<sub>2</sub> Reduction at Sulfide‐Derived Cu−Cd
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- Venkata Sai Sriram Mosali
- School of Chemistry Monash University Clayton 3800 Victoria Australia
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- Xiaolong Zhang
- School of Chemistry Monash University Clayton 3800 Victoria Australia
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- Yan Liang
- School of Chemistry Monash University Clayton 3800 Victoria Australia
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- Linbo Li
- School of Chemistry Monash University Clayton 3800 Victoria Australia
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- Graeme Puxty
- CSIRO Energy 10 Murray Dwyer Circuit, Mayfield West Newcastle 2304 New South Wales Australia
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- Michael D. Horne
- CSIRO Manufacturing Clayton 3168 Victoria Australia
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- Anna Brajter‐Toth
- School of Chemistry Monash University Clayton 3800 Victoria Australia
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- Alan M. Bond
- School of Chemistry Monash University Clayton 3800 Victoria Australia
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- Jie Zhang
- School of Chemistry Monash University Clayton 3800 Victoria Australia
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説明
<jats:title>Abstract</jats:title><jats:p>The development of Cu‐based catalysts for the electrochemical CO<jats:sub>2</jats:sub> reduction reaction (eCO<jats:sub>2</jats:sub>RR) is of major interest for generating commercially important C<jats:sub>2</jats:sub> liquid products such as ethanol. Cu is exclusive among the eCO<jats:sub>2</jats:sub>RR metallic catalysts in that it facilitates the formation of a range of highly reduced C<jats:sub>2</jats:sub> products, with a reasonable total faradaic efficiency but poor product selectivity. Here, a series of new sulfide‐derived copper‐cadmium catalysts (SD‐Cu<jats:sub><jats:italic>x</jats:italic></jats:sub>Cd<jats:sub><jats:italic>y</jats:italic></jats:sub>) was developed. An excellent faradaic efficiency of around 32 % but with a relatively low current density of 0.6 mA cm<jats:sup>−2</jats:sup> for ethanol was obtained using the SD‐CuCd<jats:sub>2</jats:sub> catalyst at the relatively low overpotential of 0.89 V in a CO<jats:sub>2</jats:sub>‐saturated aqueous 0.10 <jats:sc>m</jats:sc> KHCO<jats:sub>3</jats:sub> solution with an H‐cell. The current density increased by an order of magnitude under similar conditions using a flow cell where the mass transport rate for CO<jats:sub>2</jats:sub> was greatly enhanced. <jats:italic>Ex situ</jats:italic> spectroscopic and microscopic, and voltammetric investigations pointed to the role of abundant phase boundaries between CdS and Cu<jats:sup>+</jats:sup>/Cu sites in the SD‐CuCd<jats:sub>2</jats:sub> catalyst in enhancing the selectivity and efficiency of ethanol formation at low potentials.</jats:p>
収録刊行物
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- ChemSusChem
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ChemSusChem 14 (14), 2924-2934, 2021-06-16
Wiley
