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Strategies for the deposition of LaFeO3 photocathodes: improving the photocurrent with a polymer template

DOI: 10.1039/C9SE01103J DOI Help

Authors: Emma Freeman (University of Bath; University of Bristol) , Santosh Kumar (University of Bath; Imperial College London) , Veronica Celorrio (Diamond Light Source) , Min Su Park (Yonsei University) , Jong Hak Kim (Yonsei University) , David J. Fermin (University of Bristol) , Salvador Eslava (University of Bath; Imperial College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Sustainable Energy & Fuels , VOL 4 , PAGES 884 - 894

State: Published (Approved)
Published: February 2020

Open Access Open Access

Abstract: Renewable and sustainable alternatives to fossil fuels are needed to limit the impact of global warming. Using metal oxide semiconductors as photoelectrodes within photoelectrochemical cell devices, in which solar energy can be stored and ultimately used for electricity generation, is one such alternative. LaFeO3 (LFO) has been shown to be an active photocathode in the illumination of visible light but is restricted by a low surface area and relatively low photocurrents achieved. The work herein utilizes a spin coating deposition method with a solution of nitrate precursors combined with a non-ionic polymeric surfactant (Triton X-100). This allowed for the formation of a uniform porous LFO film of high coverage on a fluorine-doped tin oxide-coated substrate by directing the growth and preventing particle aggregation during film fabrication. These porous LFO films achieved an enhanced photocurrent of −161 ± 6 μA cm−2 at +0.43 VRHE, in addition to a remarkably high onset potential of +1.4 VRHE for cathodic photocurrent. It was additionally shown that the attained film quality and activity were superior to those of other film fabrication methods such as doctor blading and spray pyrolysis. With this polymer templating method for LFO films, not only are higher photocurrents achieved but there are also added benefits such as better charge separation, higher efficiencies, higher specific electrochemically active surface area, and improved stability.

Subject Areas: Chemistry, Energy

Facility: HarwellXPS


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