Charge Behavior in Photocatalytic Hydrogen Production by Photo Electrochemical Test Based on Nanomaterial of CoS2 Modified g-C3N4

Seeking and developing a new approach to energy conversion is of significance to the development of future society. Hydrogen energy is expected to become an ideal green energy. In this work, g-C 3 N 4 nanocomposites were modified with non-noble metal-sulfide CoS 2 as a co-catalyst for hydrogen evolution, and the charge behavior in a photocatalytic process was studied by optical characterization and photo electrochemical test technology. The experiments proved that the composite material showed a superior hydrogen production performance when the CoS 2 load was 5[Formula: see text]wt.% and the optimal hydrogen production activity was 119.7[Formula: see text][Formula: see text]mol[Formula: see text]g[Formula: see text]. CoS 2 as the reactivity site improved the migration and separation of the photo-generated charge significantly, the transfer resistance of the photogenerated charge decreased visibly after the CoS 2 loading, the photocurrent increased three times and the effective carrier lifetime on the catalyst conduction band increased ten times. The photocatalysts maintained a good stability in a 12[Formula: see text]h hydrogen production activity test and a one hour photocurrent test. This work provides guidance for the design of an efficient catalyst and the study of effective charge.