Heterojunction between bimetallic metal-organic framework and TiO2: Band-structure engineering for effective photoelectrochemical water splitting

Ji Won Yoon, Jae Hyeok Kim, Young Moo Jo, Jong Heun Lee

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Bimetallic Fe/Ni-based metal-organic frameworks (MOFs) with different Fe/Ni ratios were coated on TiO2 nanorods (NRs), and the performances of the heterojunction photoanodes in photoelectrochemical water splitting were investigated. The bandgaps and band positions of the MOFs could be modulated by changing the ratio of the Fe and Ni components. An ideal band alignment was achieved between the TiO2 NRs and bimetallic MOFs with an optimum ratio of [Fe]/[Ni] = 0.25/0.75, which allowed efficient light absorption and charge separation. The coating of NH2−MIL(Fe)−88 layer on the TiO2 NRs decreased the photocurrent density by 33%. In comparison, TiO2/NH2−MIL(Ni)−88 showed a modest improvement in photocurrent density (0.85 mA·cm−2 at 1.23 V vs. a reversible hydrogen electrode (RHE)). When bimetallic NH2−MIL(Fe0.25Ni0.75)−88 was coated on the TiO2 NRs, the photocurrent density reached 1.56 mA·cm−2, which was an efficiency enhancement of 3.2 times. The mechanism underlying high photoelectrochemical performance was investigated. [Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)8502-8509
Number of pages8
JournalNano Research
Volume15
Issue number9
DOIs
Publication statusPublished - 2022 Sep

Keywords

  • NH-MIL-88
  • TiO nanorods
  • band-structure engineering
  • bimetallic metal-organic frameworks (MOFs)
  • solar water splitting

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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