Incorporation of oxidized zeolitic imidazolate framework 67 as effective Co-catalyst on W-doped BiVO4 for catalyzing photoelectrochemical water oxidation

Tsai Mu Cheng, Hao Pai, Chia Shuo Hsu, Subbiramaniyan Kubendhiran, Sibidou Yougbaré, Lu Yin Lin, Yung Fu Wu

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Bismuth vanadate (BiVO4) with suitable conduction/valence band edges and band gap has been largely applied on photoelectrochemical catalytic water oxidation as clean energy technology. To solve the short charge diffusion length and poor water oxidation kinetics of BiVO4, it is useful to dope heteroatoms and decorate co-catalysts for improving its catalytic ability and electricity. Oxidized zeolitic imidazolate framework 67 (ZIF67) with polyhedron structure and possible composition of cobalt oxide is highly attractive as co-catalyst of BiVO4. In this study, it is the first time to decorate oxidized ZIF67 (O67) as co-catalyst on W-doped BiVO4 (WBVO) using the drop casting technique for catalyzing photoelectrochemical water oxidation. Different amounts of ZIF67 are decorated on WBVO using the drop-casting technique. The O67 is merged into WBVO nanorod arrays after converting ZIF67 into O67 using the annealing process. The highest photocurrent density of 2.08 mA/cm2 at 1.23 V versus reversible hydrogen electrode (VRHE) is obtained for the optimal WBVO/O67 electrode in the electrolyte without hole scavenger, while the WBVO electrode only shows the photocurrent density of 1.20 mA/cm2 at the same condition. The decoration of O67 can increase light absorption, generate active sites, and reduce charge recombination. The photocurrent retention higher than 92% is achieved for the WBVO/O67 electrode under continuous illumination for 5000 s. The greatly enhanced photoelectrochemical catalytic ability of WBVO/O67 implies the feasibility of utilizing oxidized ZIF67 as a co-catalyst to accelerating water oxidation.

Original languageEnglish
Pages (from-to)5152-5165
Number of pages14
JournalInternational Journal of Hydrogen Energy
Volume48
Issue number13
DOIs
Publication statusPublished - Feb 2023

Keywords

  • BiVO
  • Doping
  • Drop-casting
  • Hydrothermal
  • Water oxidation
  • ZIF67

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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