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Sustainable Energy & Fuels, Vol. 3, Issue 7, 1720-1729 (2018)

First demonstration of solar hydrogen production at FOTON institute

 
 

Photoelectrochemical water oxidation of GaP(1-x)Sbx with a direct band gap of 1.65 eV for full spectrum solar energy harvesting.

Hydrogen produced using artificial photosynthesis, i.e. solar splitting of water, is a promising energy alternative to fossil fuels. Efficient solar water splitting demands a suitable band gap to absorb near full spectrum solar energy and a photoelectrode that is stable in strongly alkaline or acidic electrolytes. In this work published by the prestigious RSC, the authors from FOTON institute and University College London demonstrate for the first time, a perfectly relaxed GaP0.67Sb0.33 monocrystalline alloy grown on the low cost silicon substrate with a direct band gap of 1.65 eV by MBE) without any evidence of chemical disorder. Under one Sun illumination, the photoanode yields an IPCE of 67.1 % over the visible range between wavelengths 400 nm to 650 nm. Moreover, the GaP0.67Sb0.33 photoanode was stable over 5 h without degradation of the photocurrent under strong alkaline conditions under continuous illumination at 1 V versus RHE. Importantly, this demonstration paves the way for an ideal tandem photoelectrochemical system with a theoretical solar to hydrogen efficiency of 27 %.

 

 
Contact
Charles CORNET

charles.cornet insa-rennes.fr

+33 2 23 23 83 99

 
Partners

UCL Department of Electronic and Electrical Engineering (London, Great-Britain), KACST (Riyadh, Saudi Arabia), UCL Department of Chemistry (London, Great-Britain)

 
Reference

Photoelectrochemical water oxidation of GaP(1-x)Sbx with a direct band gap of 1.65 eV for full spectrum solar energy harvesting, M.Alqahtani, S.Sathasivam, L.Chen, P.Jurczak, R.Piron, C.Levallois, A.Létoublon, Y.Léger, S.Boyer-Richard, N.Bertru, J.-M.Jancu, C.Cornet, J.Wu and I.P.Parkin Sustain. Energ. Fuels Vol. 3, 1720-1729, 2019, hal-02178176

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