Photoelectrochemical water splitting using lithium doped bismuth vanadate photoanode with near-complete bulk charge separation

Jyoti Prakash, Umesh Prasad, Xuan Shi, Xihong Peng, Bruno Azeredo, Arunachala M. Kannan

Research output: Contribution to journalArticle

Abstract

Photoelectrochemical performance of BiVO4 photoanode is limited by poor light absorption, charge separation and transfer efficiencies. For the first time in the literature, Li doped nano-porous BiVO4 photoanode showed complete bulk charge separation efficiency (~100%) at 1.23 V vs RHE along with enhanced light absorption for water splitting. Li doping showed an increase (>20 times) in the photoelectrochemical water splitting compared to pristine BiVO4 photoanode. In particular, oxygen evolution catalyst was also employed for further improving the photoelectrochemical performance (4.2 ± 0.18 mA cm−2) of Li:BiVO4 photoanodes. The density functional theory calculations showing the formation of inter-band with band gap reduction due to interstitial Li doping in BiVO4 structure support enhancement in photoelectrochemical performance. In addition, Li doping in the BiVO4 lattice void positions led to a record photocurrent density of 7.3 ± 0.36 mA cm−2 at 1.23 V vs RHE in the presence of hole scavenger under one sun illumination. Further, present study systematically demonstrates role of Li in BiVO4 host for water oxidation through a detailed characterization and study of optical and charge transport properties.

Original languageEnglish (US)
Article number227418
JournalJournal of Power Sources
DOIs
StateAccepted/In press - Jan 1 2019

Fingerprint

water splitting
vanadates
polarization (charge separation)
Bismuth
Lithium
bismuth
lithium
Doping (additives)
electromagnetic absorption
Light absorption
Water
Photocurrents
Sun
Transport properties
Density functional theory
photocurrents
Charge transfer
voids
interstitials
sun

Keywords

  • Bismuth vanadate
  • Charge separation
  • Lithium doping
  • Water splitting

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

Photoelectrochemical water splitting using lithium doped bismuth vanadate photoanode with near-complete bulk charge separation. / Prakash, Jyoti; Prasad, Umesh; Shi, Xuan; Peng, Xihong; Azeredo, Bruno; Kannan, Arunachala M.

In: Journal of Power Sources, 01.01.2019.

Research output: Contribution to journalArticle

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