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Issue 2, 2019
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Enhancing photoelectrochemical hydrogen production of a n+p-Si hetero-junction photocathode with amorphous Ni and Ti layers

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Abstract

Herein, a novel n+p-Si/5 nm Ti/5 nm Ni hetero-junction photocathode was designed and fabricated by coating an amorphous Ti layer (the protection layer) and a Ni layer (the earth-abundant HER catalyst) on mircopyramid-like n+p-Si. We demonstrate its enhanced photoelectrochemical (PEC) hydrogen generation performance with a photocurrent density of −38.7 mA cm−2 at 0 V (vs. RHE), an onset potential of 0.61 V (vs. RHE), and an applied bias photon-to-current efficiency (ABPE) of 5.1% under simulated 100 mW cm−2 (1 Sun) with an AM 1.5G filter in 1 M KOH. To the best of our knowledge, this is a new record ABPE for a p-type Si or n+p-Si-based PEC hydrogen generation system. The outstanding performance is attributed to the light-harvesting capability of mircopyramid-like n+p-Si/Ti/Ni, and the high-quality interfaces between each layer of Si/Ti/Ni.

Graphical abstract: Enhancing photoelectrochemical hydrogen production of a n+p-Si hetero-junction photocathode with amorphous Ni and Ti layers

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The article was received on 25 Nov 2018, accepted on 03 Jan 2019 and first published on 03 Jan 2019


Article type: Research Article
DOI: 10.1039/C8QI01269E
Inorg. Chem. Front., 2019,6, 527-532

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    Enhancing photoelectrochemical hydrogen production of a n+p-Si hetero-junction photocathode with amorphous Ni and Ti layers

    C. Yu, Q. Jia, H. Zhang, W. Liu, X. Yu and X. Zhang, Inorg. Chem. Front., 2019, 6, 527
    DOI: 10.1039/C8QI01269E

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