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Dispersed Ni Nanoparticles Stabilize Silicon Photoanodes for Efficient and Inexpensive Sunlight-Assisted Water Oxidation

Abstract : Ni electrodeposited on n-type Si from aqueous solutions in the form of isolated or coalescent nanoparticles (NPs) protects the underlying and partially exposed Si from photocorrosion-induced electrical passivation. Such photoanodes, fabricated without the need for additional protecting layers, a buried junction, and high vacuum techniques, show a high photovoltage of similar to 500 mV for the oxygen evolution reaction (OER), state-of-the-art photocurrents, and faradaic efficiencies > 90% under AM 1.5G illumination conditions at pH 14. Remarkably, these photoelectrodes are stable and can be operated at the light limited catalytic current from 10 h to more than 40 h in 1 M NaOH. These findings demonstrate that robust and efficient Si-based photoanodes can be produced easily, which opens new opportunities for the implementation of low-cost Si-based monolithic photoelectrochemical cells for efficient solar fuel production.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01517483
Contributor : Laurent Jonchère <>
Submitted on : Tuesday, July 4, 2017 - 1:32:28 PM
Last modification on : Friday, July 10, 2020 - 4:20:20 PM
Long-term archiving on: : Friday, December 15, 2017 - 12:22:06 AM

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Gabriel Loget, Bruno Fabre, Stephanie Fryars, Cristelle Mériadec, Soraya Ababou-Girard. Dispersed Ni Nanoparticles Stabilize Silicon Photoanodes for Efficient and Inexpensive Sunlight-Assisted Water Oxidation. ACS Energy Letters, American Chemical Society 2017, 2 (3), pp.569-573. ⟨10.1021/acsenergylett.7b00034⟩. ⟨hal-01517483⟩

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