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

2 Scopus citations

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
Volume448
DOIs
StatePublished - Feb 1 2020

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

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