Effect of Mn2+ incorporation on the photoelectrochemical properties of BiVO4. (24th January 2022)

• Record Type: Journal Article
• Authors: Dagar, Preeti; Kumar, Sandeep; Ganguli, Ashok Kumar
• Is Part Of: New journal of chemistry. Volume 46:Number 6(2022)
• Page Start: 2875
• Page End: 2886
• Publication Date: 2022-01-24
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d1nj05292f
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Mn 2+ –BiVO4 photoanodes (Mn 2+ = 0.2–1%) to improve the charge-carrier separation and electrical conductivity of BiVO4 are reported. Abstract : BiVO4 is a promising photoanode material for photoelectrochemical water splitting applications due to its narrow band gap, i.e., ∼2.4 eV, suitable band-edge positions, non-toxicity, and high stability. Here, we report the synthesis of Mn 2+ -doped BiVO4 with varying concentrations of Mn 2+ (0.2–1.0%) to improve the charge-transport properties of the catalyst. The addition of Mn enables forbidden d–d transitions, which are utilized to slow down the charge-carrier recombination and increase the efficiency. The highest efficiency was achieved in the case of the 1.0% Mn 2+ –BiVO4 photoanode, which exhibits a photocurrent density of 1.163 mA cm −2 at 1.23 V and 1.56 mA cm −2 at 1.4 V vs. RHE. The enhanced photoelectrochemical performance of Mn 2+ –BiVO4 implies a higher charge-carrier separation and an improved electrical conductivity. This suggests that Mn 2+ -doped BiVO4 may be used as a promising photoanode in future energy-conversion devices.