Simple Cadmium Sulfide Compound with Stable 95 % Selectivity for Carbon Dioxide Electroreduction in Aqueous Medium

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Developing efficient electrocatalysts for CO2 reduction is crucial for sustainable energy solutions.
• Cadmium sulfide (CdS) nanomaterials show promise but require optimization for stability and selectivity.

Purpose of the Study:

• To investigate the electrocatalytic performance of a simple cadmium sulfide (CdS) nanomaterial for CO2 reduction.
• To understand the mechanism behind its high selectivity and stability.

Main Methods:

• Electrochemical characterization of CdS nanomaterial in aqueous medium.
• Operando spectroscopic studies and theoretical calculations to probe the active sites and reaction pathways.

Main Results:

• CdS nanomaterial demonstrated stable electrocatalytic activity for over 40 hours.
• Achieved a high Faradaic efficiency of ~95% for CO production at a low overpotential of -0.55 V.
• High selectivity for CO2 reduction was attributed to the (0002) crystal face with sulfur vacancies.

Conclusions:

• The CdS nanomaterial is a highly efficient and stable electrocatalyst for CO2 to CO conversion.
• Sulfur vacancies on the (0002) face of CdS play a critical role in enhancing CO2 selectivity in aqueous media.