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Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
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CdS-Enhanced Ethanol Selectivity in Electrocatalytic CO2 Reduction at Sulfide-Derived Cu-Cd
Venkata Sai Sriram Mosali1, Xiaolong Zhang1, Yan Liang1
1School of Chemistry, Monash University, Clayton, 3800, Victoria, Australia.
Chemsuschem
|May 22, 2021
Summary
New copper-cadmium catalysts effectively convert carbon dioxide into ethanol, a valuable liquid product. These sulfide-derived catalysts show promise for efficient electrochemical CO2 reduction, enhancing ethanol selectivity.
Area of Science:
- Electrochemistry
- Catalysis
- Materials Science
Background:
- Copper-based catalysts are crucial for electrochemical CO2 reduction (eCO2 RR) to produce C2 products like ethanol.
- While copper facilitates C2 formation, it suffers from poor product selectivity.
Purpose of the Study:
- To develop novel sulfide-derived copper-cadmium catalysts (SD-Cu_x Cd_y) for enhanced eCO2 RR.
- To improve ethanol selectivity and efficiency in CO2 reduction.
Main Methods:
- Synthesis of sulfide-derived copper-cadmium catalysts (SD-Cu_x Cd_y).
- Electrochemical evaluation in an H-cell and a flow cell setup.
- Ex situ spectroscopic, microscopic, and voltammetric analyses.
Main Results:
- SD-CuCd2 catalyst achieved 32% faradaic efficiency for ethanol at 0.89 V in an H-cell.
- Current density increased significantly in a flow cell due to enhanced CO2 mass transport.
- Abundant phase boundaries between CdS and Cu+/Cu sites were identified as key to performance.
Conclusions:
- Sulfide-derived copper-cadmium catalysts, particularly SD-CuCd2, enhance ethanol selectivity and efficiency in eCO2 RR.
- Phase boundaries in the catalyst structure play a critical role in low-potential ethanol formation.
- Flow cell configurations significantly boost CO2 reduction rates.
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