Promoting photoelectrochemical hydrogen production performance by fabrication of Co1-XS decorating BiVO4 photoanode. (5th January 2022)

• Record Type: Journal Article
• Authors: Sun, Dongtian; Fan, Weiqiang; Wang, Fengfeng; Bai, Yajie; Bai, Hongye; Shi, Weidong
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 2(2022)
• Page Start: 940
• Page End: 949
• Publication Date: 2022-01-05
• Subjects: Photoelectrochemical water splitting -- Hydrogen energy -- Solar conversion -- BiVO4/Co1-XS; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.10.075
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Photoelectrochemical (PEC) water splitting is an effective way of converting solar energy into hydrogen (H2 ) energy. However, the carriers' transmission and the reaction kinetics of the photoelectrode are dilatory, which will influence the conversion efficiency of solar energy to H2 . In this work, a novel of BiVO4 /Co1-X S photoanode was successfully fabricated through the successive ionic layer adsorption reaction. The photocurrent density of optimal sample BiVO4 /Co1-X S (2.9 mA cm −2 at 1.23 VRHE ) has reached up to 5 times that of pure BiVO4, and the applied bias photon to current conversion efficiency increased from 0.04% (BiVO4 ) to 0.4% (BiVO4 /Co1-X S). The superior PEC performance of the BiVO4 /Co1-X S photoanode is mainly related to the improved conductivities and reaction kinetics. The charge injection efficiency of BiVO4 /Co1-X S grew to about 80%, and the charge separation efficiency was up to 34%, revealing that the decoration of Co1-X S could significantly accelerate the transfer speed of photogenerated carriers from the electrode surface to the electrolyte. This work provided an efficient and simple scheme for improving the PEC performance of photoanode, through reasonable design and research. Graphical abstract: Image 1 Highlights: BiVO4 /Co1-X S was fabricated through the ionic layer adsorption reaction. Photocurrent density of Co1-X S/BiVO4 reached 5 times that of pure BiVO4. Co1-X S could effectively improve the conductivity and charge transfer. Good stability endows BiVO4 /Co1-X S with promising practical potential.