Jump to main content
Jump to site search

Issue 10, 2018
Previous Article Next Article

Role of cobalt–iron (oxy)hydroxide (CoFeOx) as oxygen evolution catalyst on hematite photoanodes

Author affiliations

Abstract

Photoelectrochemical solar water splitting into hydrogen and oxygen offers an elegant and potentially efficient way to store solar energy in the chemical bonds of hydrogen, but the oxygen evolution rate is quite limited. The deposition of an oxygen evolution catalyst on the photoanode can enhance oxygen evolution, although the precise interplay between the semiconductor and the catalyst remains poorly understood and unoptimized. In this work, we use a combination of electrochemical approaches, including photoelectrochemical impedance spectroscopy and intensity modulated photocurrent spectroscopy, to unravel the nature of the interactions between different loadings of an electrocatalyst (CoFeOx) and a hematite (α-Fe2O3) semiconductor. A thin layer of CoFeOx mainly reduces surface charge recombination, while an extremely thin layer enhances charge transfer kinetics. Moreover, an interlayer of GaOx modifies the surface state distribution and increases the charge transfer rate even further. These findings point to new opportunities for understanding and manipulating complex photoanodes for oxygen evolution.

Graphical abstract: Role of cobalt–iron (oxy)hydroxide (CoFeOx) as oxygen evolution catalyst on hematite photoanodes

Back to tab navigation

Supplementary files

Publication details

The article was received on 08 May 2018, accepted on 16 Jul 2018 and first published on 18 Jul 2018


Article type: Paper
DOI: 10.1039/C8EE01346B
Citation: Energy Environ. Sci., 2018,11, 2972-2984
  • Open access: Creative Commons BY license
  •   Request permissions

    Role of cobalt–iron (oxy)hydroxide (CoFeOx) as oxygen evolution catalyst on hematite photoanodes

    J. Zhang, R. García-Rodríguez, P. Cameron and S. Eslava, Energy Environ. Sci., 2018, 11, 2972
    DOI: 10.1039/C8EE01346B

    This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material.

    Reproduced material should be attributed as follows:

    • For reproduction of material from NJC:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
    • For reproduction of material from PCCP:
      [Original citation] - Published by the PCCP Owner Societies.
    • For reproduction of material from PPS:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
    • For reproduction of material from all other RSC journals:
      [Original citation] - Published by The Royal Society of Chemistry.

    Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

Search articles by author

Spotlight

Advertisements