4.8 Article

Precious Metal-Free Photocatalytic Water Oxidation by a Layered Double Hydroxide-Prussian Blue Analogue Hybrid Assembly

Journal

CHEMSUSCHEM
Volume 14, Issue 2, Pages 679-685

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202002279

Keywords

layered double hydroxides; photocatalysis; Prussian blue; water oxidation; water splitting

Funding

  1. TUBITAK [118Z277]
  2. BAGEP
  3. TuBA-GEBP

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In this study, a combination of ZnCr layered double hydroxide and CoFe Prussian blue analogue resulted in an earth-abundant photocatalytic assembly with threefold enhancement in photocatalytic activity, providing a straightforward pathway to develop low-cost and precious metal-free assemblies for visible light-driven water oxidation.
The development of earth-abundant photocatalytic assemblies has been one of the bottlenecks for the advancement of scalable water splitting cells. In this study, a ZnCr layered double hydroxide and a CoFe Prussian blue analogue are combined to afford an earth-abundant photocatalytic assembly involving a visible light-absorbing semiconductor (SC) and a water oxidation catalyst (WOC). Compared to bare ZnCr-LDH, the SC-WOC hybrid assembly exhibits a threefold enhancement in photocatalytic activity, which is maintained for 6 h under photocatalytic conditions at pH 7. The band energy diagram was extracted from optical and electrochemical studies to elucidate the origin of the enhanced photocatalytic performance. This study marks a straightforward pathway to develop low-cost and precious metal-free assemblies for visible light-driven water oxidation.

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