Enhanced visible light photocatalytic hydrogen evolution by Ni cations precise institute S anion in CdS and P ions targeted linking with Ni

Abstract

Ni directional doping in the lattice of CdSV with the Ni cations targeted linked to P (CdSV-Ni-P) was successfully synthesized via a step wise assembly method, which exhibited an excellent photocatalytic hydrogen production performance. The photoelectric performance characterization proved that the Ni directional doping and Ni cations targeted linked with P in CdSV-Ni-P not only accelerating the photo-generated electrons transfer but also decreasing efficiency of the charge recombination. The density functional theory (DFT) calculations proved that CdSV-Ni-P can also induce more charge-carriers participate in photocatalytic reaction and decrease electron binding restriction capacity. Moreover, the results of UV–vis DR spectra and VB-XPS spectra confirmed that the construction of this CdSV-Ni-P could effectively narrow the bandgap. Meanwhile, the result of Gibbs free energy demonstrated the S-H adsorption bond in CdSV-Ni-P was get weaken, which is benefit for hydrogen desorption from S sites, thus achieving a high hydrogen evolution reaction (HER) result. Based on the synergistic effects, CdSV-Ni6.7-P9.6 presented a relatively high hydrogen evolution rate of 167.5 mmol h-1g−1 under the visible light irradiation (λ ≥ 420 nm), which is almost 60 times of CdSV.