Hydrogen production by water reduction on Si photocathode coupled with Ni 2 P

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Title
Hydrogen production by water reduction on Si photocathode coupled with Ni 2 P
Author(s)
Indranil Mondal; Song Yi Moon; Heeyoung Kim; Jeong Young Park
Publication Date
2019-03
Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.44, no.14, pp.7241 - 7251
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
While searching for an efficient, non-noble, earth-abundant catalyst for the hydrogen evolution reaction (HER), we synthesized hexagonal dinickel phosphide with different nanostructures using solvothermal phosphidation. Coupled atop p-type Si, this catalyst performed as a p-n heterojunction photocathode assembly and the performance varied when under different electrolyte media. Apart from changing the surface morphology, Ni 2 P was crystallized with an increase in the Ni δ+ /Ni 2+ ratio as the phosphidation temperature gradually increased. A systematic evaluation of the water splitting reaction shows that a very small amount of catalyst (>85% transmittance for the catalyst layer) exhibits a photocurrent of −10 mA cm −2 with a positive applied potential of 0.05 V versus reversible hydrogen electrode under simulated solar irradiation of AM 1.5G. We discuss the substantial charge transfer process at the depletion layer of the electrode/catalyst and the catalyst/electrolyte interface. Mott–Shottky analysis showed a shift in the flat band potential for Ni 2 P, which reveals the underlying mechanism for the role of the p-n junction for enhanced photoelectrochemical cell performance. © 2019 Hydrogen Energy Publications Ltd
URI
https://pr.ibs.re.kr/handle/8788114/5660
ISSN
0360-3199
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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