• 文献标题:   Hybrid FeNiOOH/alpha-Fe2O3/Graphene Photoelectrodes with Advanced Water Oxidation Performance
  • 文献类型:   Article
  • 作  者:   KORMANYOS A, KECSENOVITY E, HONARFAR A, PULLERITS T, JANAKY C
  • 作者关键词:   composite material, interface engineering, photoelectrochemistry, solar fuel, transient absorption spectroscopy
  • 出版物名称:   ADVANCED FUNCTIONAL MATERIALS
  • ISSN:   1616-301X EI 1616-3028
  • 通讯作者地址:   Univ Szeged
  • 被引频次:   0
  • DOI:   10.1002/adfm.202002124 EA JUN 2020
  • 出版年:   2020

▎ 摘  要

In this study, the photoelectrochemical behavior of electrodeposited FeNiOOH/Fe2O3/graphene nanohybrid electrodes is investigated, which has precisely controlled structure and composition. The photoelectrode assembly is designed in a bioinspired manner where each component has its own function: Fe(2)O(3)is responsible for the absorption of light, the graphene framework for proper charge carrier transport, while the FeNiOOH overlayer for facile water oxidation. The effect of each component on the photoelectrochemical behavior is studied by linear sweep photovoltammetry, incident photon-to-charge carrier conversion efficiency measurements, and long-term photoelectrolysis. 2.6 times higher photocurrents are obtained for the best-performing FeNiOOH/Fe2O3/graphene system compared to its pristine Fe(2)O(3)counterpart. Transient absorption spectroscopy measurements reveal an increased hole-lifetime in the case of the Fe2O3/graphene samples. Long-term photoelectrolysis measurements in combination with Raman spectroscopy, however, prove that the underlying nanocarbon framework is corroded by the photogenerated holes. This issue is tackled by the electrodeposition of a thin FeNiOOH overlayer, which rapidly accepts the photogenerated holes from Fe2O3, thus eliminating the pathway leading to the corrosion of graphene.