RETURN TO ISSUEPREVEnergy, Environmenta...Energy, Environmental, and Catalysis ApplicationsNEXT

Role of Alkali Metal in BiVO4 Crystal Structure for Enhancing Charge Separation and Diffusion Length for Photoelectrochemical Water Splitting

Cite this: ACS Appl. Mater. Interfaces 2020, 12, 47, 52808–52818
Publication Date (Web):November 13, 2020
https://doi.org/10.1021/acsami.0c16519
Copyright © 2020 American Chemical Society
Article Views
1371
Altmetric
-
Citations
LEARN ABOUT THESE METRICS
Read OnlinePDF (5 MB)
Supporting Info (1)»

Abstract

Alkali metal (Na or K) doping in BiVO4 was examined systematically for enhancing bulk charge separation and transport in addition to improving charge transfer from the surface. The alkali metal-doped BiVO4 thin film photoanodes having nanostructured porous grain surface morphology exhibited better photocurrent density than pristine BiVO4. In particular, Na:BiVO4/Fe:Ni/Co–Pi photoanode showed a significantly improved photocurrent of 3.2 ± 0.15 mA·cm–2 in 0.1 M K2HPO4 electrolyte at 1.23 VRHE under 1 sun illumination. The depth-dependent Doppler broadening spectroscopy measurements confirmed the significant reduction in Bi- and V-based defect density with Na metal doping, and this led to a higher bulk diffusion length of charge pairs (four times that of the pristine one). Na doping led to reduced surface defects resulting in improved surface charge transfer based on cyclic voltammetry experiments. The density functional theory calculations confirmed the improved performance in Na-doped BiVO4 photoanodes achieved through interband formation and reduction in the band gap.

Supporting Information

ARTICLE SECTIONS
Jump To

The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsami.0c16519.

  • Additional information including photoelectrochemical and Mott–Schottky measurement details, calculation process of theoretical photocurrent, charge transport, IPCE, APCE, integrated current, LHE, and absorption efficiency evaluation; various analysis including Mott–Schottky, EDX, XPS, UV–vis, ECSA, and DFT calculation details; and tables including lattice parameters, XPS, calculated parameters, formation energies, and spd-orbital site projections for the three interbands (PDF)

Terms & Conditions

Most electronic Supporting Information files are available without a subscription to ACS Web Editions. Such files may be downloaded by article for research use (if there is a public use license linked to the relevant article, that license may permit other uses). Permission may be obtained from ACS for other uses through requests via the RightsLink permission system: http://pubs.acs.org/page/copyright/permissions.html.

Cited By


This article is cited by 5 publications.

  1. Liqun Wang, Wenping Si, Yuhang Ye, Sihui Wang, Feng Hou, Xinggang Hou, Hongkun Cai, Shi Xue Dou, Ji Liang. Cu-Ion-Implanted and Polymeric Carbon Nitride-Decorated TiO2 Nanotube Array for Unassisted Photoelectrochemical Water Splitting. ACS Applied Materials & Interfaces 2021, 13 (37) , 44184-44194. https://doi.org/10.1021/acsami.1c09665
  2. Aditya Singh, Sujay Karmakar, Suddhasatwa Basu. Role of sputtered WO3 underlayer and NiFeCr-LDH co-catalyst in WO3–BiVO4 heterojunction for enhanced photoelectrochemical water oxidation. International Journal of Hydrogen Energy 2021, 46 (80) , 39868-39881. https://doi.org/10.1016/j.ijhydene.2021.09.248
  3. Hoang V. Le, Minh D. Nguyen, Yen Thi Hai Pham, Duc N. Nguyen, Ly T. Le, Hyuksu Han, Phong D. Tran. Decoration of AgOx hole collector to boost photocatalytic water oxidation activity of BiVO4 photoanode. Materials Today Energy 2021, 21 , 100762. https://doi.org/10.1016/j.mtener.2021.100762
  4. Umesh Prasad, James L. Young, Justin C. Johnson, Deborah L. McGott, Hengfei Gu, Eric Garfunkel, Arunachala M. Kannan. Enhancing interfacial charge transfer in a WO 3 /BiVO 4 photoanode heterojunction through gallium and tungsten co-doping and a sulfur modified Bi 2 O 3 interfacial layer. Journal of Materials Chemistry A 2021, 9 (29) , 16137-16149. https://doi.org/10.1039/D1TA03786B
  5. Basanth S. Kalanoor, Hyungtak Seo, Shankara S. Kalanur. Multiple ion doping in BiVO4 as an effective strategy of enhancing photoelectrochemical water splitting: A review. Materials Science for Energy Technologies 2021, 4 , 317-328. https://doi.org/10.1016/j.mset.2021.08.010