Enhancing photocatalytic CO2 reduction activity through Cobalt-Bismuth bimetallic Nanoparticle-Modified Nitrogen-Doped graphite carbon

Efficient charge transfer and effective separation of photo-generated charge carriers are crucial factors in photocatalysis . In this study, we present the design of a composite photocatalyst consisting of cobalt and bismuth (CoBi) bimetallic nanoparticles incorporated into a honeycomb nitrogen-doped graphitic carbon ( N -GC) matrix. The ultra-thin porous N -GC matrix exhibits excellent electrical conductivity , a high number of active sites, and enables efficient absorption and multiple reflection of incident light. The CoBi bimetal- N -GC interface establishes a self-driven charge transport channel that effectively suppresses the backflow of photogenerated electrons, leading to prolonged separation of photo-generated carriers and a significant improvement in photocatalytic activity . The CoBi@ N -GC catalyst showcases outstanding performance, producing CH 4 and CO at rates of 36.07 μmol·g −1 ·h −1 and 44.09 μmol·g −1 ·h −1 respectively, confirming its superior photocatalytic capabilities.