Direct Z-Scheme g-C 3 N 4 /FeWO 4 Nanocomposite for Enhanced and Selective Photocatalytic CO 2 Reduction under Visible Light

Reshma Bhosale, Srashti Jain, Chathakudath Prabhakaran Vinod, Santosh Kumar, Satishchandra Ogale

Research output: Contribution to journalArticle

38 Citations (Scopus)
200 Downloads (Pure)

Abstract

Photocatalytic reduction of CO 2 to renewable solar fuels is considered to be a promising strategy to simultaneously solve both global warming and energy crises. However, development of a superior photocatalytic system with high product selectivity for CO 2 reduction under solar light is the prime requisite. Herein, a series of nature-inspired Z-scheme g C 3 N 4 /FeWO 4 composites are prepared for higher performance and selective CO 2 reduction to CO as solar fuel under solar light. The novel direct Z-scheme coupling of the visible light-active FeWO 4 nanoparticles with C 3 N 4 nanosheets is seen to exhibit excellent performance for CO production with a rate of 6 μmol/g/h at an ambient temperature, almost 6 times higher compared to pristine C 3 N 4 and 15 times higher than pristine FeWO 4 . More importantly, selectivity for CO is 100% over other carbon products from CO 2 reduction and more than 90% over H 2 products from water splitting. Our results clearly demonstrate that the staggered band structure between FeWO 4 and C 3 N 4 reflecting the nature-inspired Z-scheme system not only favors superior spatial separation of the electron-hole pair in g-C 3 N 4 /FeWO 4 but also shows good reusability. The present work provides unprecedented insights for constructing the direct Z-scheme by mimicking the nature for high performance and selective photocatalytic CO 2 reduction into solar fuels under solar light.

Original languageEnglish
Pages (from-to)6174-6183
Number of pages10
JournalACS Applied Materials and Interfaces
Volume11
Issue number6
Early online date25 Jan 2019
DOIs
Publication statusPublished - 13 Feb 2019

Keywords

  • C N
  • CO reduction
  • FeWO
  • Photocatalysis
  • Z-scheme
  • solar fuels

ASJC Scopus subject areas

  • Materials Science(all)

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