Enhanced photocatalytic CO2 reduction to CH4 via phosphorus-doped carbon nitride with Cu-Cu coordinated sites

Abstract

The photocatalytic CO₂ reduction to high-value chemicals has attracted significant global interests. Despite extensive research, the efficiencies of the reported photocatalysts are hindered by inadequate light absorption, limited photoelectron transfer rates, and other associated factors. In this study, we present a facile synthesis of a novel Cu&P@C₃N₄, catalyst, featuring Cu–Cu coordination and P doping. Compared to pristine C₃N₄, the carrier separation efficiency and light absorption capacity of Cu&P@C₃N₄ are both significantly enhanced. This catalyst exhibits a remarkable photocatalytic CO₂ reduction activity, achieving a performance of 25.1 times greater than pristine C₃N₄, coupled with exceptional CH₄ selectivity exceeding 96 %. Our findings provide new insights into the design and synthesis of high-efficient and low-cost photocatalysts, paving the way for advancements in CO₂ reduction reaction (CO₂RR) technology and contributing to a more sustainable and environmentally friendly future.