0D CoP cocatalyst/ 2D g‐C₃N₄ nanosheets: An efficient photocatalyst for promoting photocatalytic hydrogen evolution

Abstract

In this work, cobalt phosphide (CoP) nanoparticles were successfully decorated on an ultrathin g‐C3N4 nanosheet photocatalysts by in situ chemical deposition. The built‐in electric field formed by heterojunction interface of the CoP/g‐C3N4 composite semiconductor can accelerate the transmission and separation of photogenerated charge‐hole pairs and effectively improve the photocatalytic performance. TEM, HRTEM, XPS, and SPV analysis showed that CoP/g‐C3N4 formed a stable heterogeneous interface and effectively enhanced photogenerated electron‐hole separation. UV‐vis DRS analysis showed that the composite had enhanced visible light absorption than pure g‐C3N4 and was a visible light driven photocatalyst. In this process, NaH2PO2 and CoCl2 are used as the source of P and Co, and typical preparation of CoP can be completed within 3 hours. Under visible light irradiation, the optimal H2 evolution rate of 3.0 mol% CoP/g‐C3N4 is about 15.1 μmol h−1. The photocatalytic activity and stability of the CoP/g‐C3N4 materials were evaluated by photocatalytic decomposition of water. The intrinsic relationship between the microstructure of the composite catalyst and the photocatalytic performance was analyzed to reveal the photocatalytic reaction mechanism.

Sulfur promoted n-π* electron transitions in thiophene-doped g-C3N4 for enhanced photocatalytic activity

“…The ESR spectra with DMPO as the trapping agent were acquired for CN-ThA30 and g-C3N4 ( Fig. 9(b)), indicating the existence of •O2  and •OH under light excitation [69,70]. No Combined with the experimental results of hydroxyl group capture by IPA, the formation of •OH radicals enhances the photocatalytic activity.…”

Crystalline phase engineering in WO3/g-C3N4 composites for improved photocatalytic performance under visible light

“…SPV spectroscopy is a powerful tool for investigating the charge separation efficiency in the semiconductor materials [32]. SPV technology is an excellent way to study the photoinduced charge behavior at the interface of semiconductors, which obtain relevant information by analyzing the change of the surface voltage of the material [33]. It is known that SPV signal intensity is sensitive to the charge separation efficiency [34].…”

Coralline-like Ni2P decorated novel tetrapod-bundle Cd0.9Zn0.1S ZB/WZ homojunctions for highly efficient visible-light photocatalytic hydrogen evolution

“…In this regard, transition-metal phosphides (TMPs), such as CoP [32], Co2P [33], MoP [34], and Cu3P [35] have higher potential as electrocatalysts due to their low cost, outstanding catalytic activity, and stability for the HER [36,37]. Researchers have confirmed that the above electrocatalysts can effectively enhance the photocatalytic HER activity as co-catalysts [38][39][40][41][42]. Consequently, we believe that this strategy for finding photocatalytic co-catalysts from TMPs is feasible.…”