Developing silicon-based photocathodes for CO2 conversion

This study is led by Prof. Jinlong Zhang (School of Chemistry and Molecular Engineering, East China University of Science and Technology).

Photoelectrochemical (PEC) conversion of CO₂ represents a promising route for solar-driven chemical fuel production, with silicon emerging as a cost-effective and highly light-absorbing material pivotal to this technology. Intending to explore opportunities to industrialize PEC CO₂ reduction (PEC-CO₂R) by minimizing reaction energy consumption to improve reaction efficiency and selectivity, this review summarizes recent progress in the development of Si-based photocathodes for PEC-CO₂R.

This review presents the basic principles, advantages, and limitations of Si photocathodes with key performance metrics. Based on this understanding, strategies to improve the performance of the PEC-CO₂R system, including light absorption, charge separation, and catalytic reactions are classified into interface modification, active site decoration, and protective layer design. The design ideas of this advantageous three-layer structure to promote efficiency, stability, and selectivity have been clarified. To fully understand the catalytic process, the influence of the photocathodic chemical environment is then discussed.

This review further consolidates insights on the mechanism and notable breakthroughs of various fuel production processes in Si-based PEC-CO₂R systems. This wealth of information provides a current perspective on the dynamic developments in silicon-based PEC-CO₂ conversion and highlights the promising paths toward sustainable fuel synthesis from pollutant CO₂.

See the article:

Developing Silicon-Based Photocathodes for CO₂ Conversion

https://doi.org/10.1007/s11426-024-2041-9