Synthesis of Host‐Guest Hematite Photoelectrodes for Solar Water Splitting

Francisco, Filipe; Dias, Paula; Ivanou, Dzmitry; Santos, Fátima; Azevedo, João; Mendes, Adélio

doi:10.1002/cnma.201900141

Title: Synthesis of Host‐Guest Hematite Photoelectrodes for Solar Water Splitting

Journal Article · 03 June 2019 · ChemNanoMat

DOI: https://doi.org/10.1002/cnma.201900141 · OSTI ID:1524108

Francisco, Filipe ^[1];

^[1]; Ivanou, Dzmitry ^[1]; Santos, Fátima ^[1]; Azevedo, João ^[2]; Mendes, Adélio ^[1]

LEPABE – Faculdade de Engenharia Universidade do Porto Rua Dr. Roberto Frias 4200-465 Porto Portugal
LEPABE – Faculdade de Engenharia Universidade do Porto Rua Dr. Roberto Frias 4200-465 Porto Portugal, IFIMUP and IN-Institute of Nanoscience and Nanotechnology Departamento de Física e Astronomia Universidade do Porto Rua do Campo Alegre 687 4169-007 Porto Portugal

Abstract Hematite (α‐Fe ₂ O ₃ ) is a promising semiconductor for photoelectrochemical (PEC) water splitting, due to its abundance, low‐cost and excellent stability. However, the efficiency of α‐Fe ₂ O ₃ photoelectrodes has been limited by its low hole mobility and fast electron‐hole recombination. Host‐guest architectures have emerged as a suitable design, which involves the use of a nanostructured collector for high solar absorption while maintaining an ultrathin absorber layer for better charge transport. In this study, a thin mesoporous SiO ₂ host template coated with a conductive thin layer of TiO ₂ was optimized to support the α‐Fe ₂ O ₃ film. The α‐Fe ₂ O ₃ thin layer was deposited by spray pyrolysis and then coated with a FeNiOOH co‐catalyst. A photocurrent improvement of ca . 85% over planar α‐Fe ₂ O ₃ thin film reference was registered demonstrating the potential of this host‐guest approach.

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Sponsoring Organization:: USDOE

OSTI ID:: 1524108

Journal Information:: ChemNanoMat, Journal Name: ChemNanoMat Vol. 5 Journal Issue: 7; ISSN 2199-692X

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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Cited by: 4 works

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