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Bismuth oxycarbonate grafted NiFe-LDH supported on g-C 3 N 4 as bifunctional catalyst for photoelectrochemical water splitting

International Journal of Hydrogen Energy, ISSN: 0360-3199, Vol: 46, Issue: 22, Page: 12145-12157
2021
  • 25
    Citations
  • 0
    Usage
  • 26
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    25
    • Citation Indexes
      25
  • Captures
    26

Article Description

In the present study, we report the synthesis of photoactive bismuth oxycarbonate (BOC, Bi 2 O 2 CO 3 ) grafted NiFe layered double hydroxide (LDH) supported on g-C 3 N 4 (15 wt% of g-C 3 N 4 ) by coprecipitation method. The band gap of this photoactive material is determined to be 1.7 eV. The Bi 2 O 2 CO 3 agglomerates are anchored on NiFe-LDH plates and g-C 3 N 4 nanosheets intercalated between the LDH plates. This architecture helps in expediting electron transfer for hydrogen and oxygen evolution reactions. The pristine NiFe-LDH photoanode acquires bifunctional character because of Bi 2 O 2 CO 3 agglomerates and g-C 3 N 4 embedded in the architecture of BOC/NiFe-LDH@g-C 3 N 4. This is found to be an efficient photoanode for oxygen evolution and photocathode for hydrogen evolution reactions. The water splitting process occurs along the heterojunction formed between g-C 3 N 4 nanosheets and Bi 2 O 2 CO 3 grafted NiFe-LDH. Further, an additional interfacial charge transfer aided by Bi 2 O 2 CO 3 results in S -scheme mechanism, which enhances the rate of photoelectrochemical hydrogen and oxygen evolution reactions.

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