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Evident Enhancement of Photoelectrochemical Hydrogen Production by Electroless Deposition of M-B (M = Ni, Co) Catalysts on Silicon Nanowire Arrays
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2016 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 8, no 44, 30143-30151 p.Article in journal (Refereed) Published
Abstract [en]

Modification of p-type Si surface by active and stable earth-abundant electrocatalysts is an effective strategy to improve the sluggish kinetics for the hydrogen evolution reaction (HER) at p-Si/electrolyte interface and to develop highly efficient and low-cost photocathodes for hydrogen production from water. To this end, Si nanowire (Si-NW) array has been loaded-with highly efficient electrocatalysts, M-B (M = Ni, Co), by facile and quick electroless plating to build M-B catalyst-modified Si nanowire-array-textured photocathodes for water reduction to H-2. Compared with the bare Si-NW array, composite Si-NWs/M-B arrays display evidently enhanced photoelectrochemical (PEC) performance. The onset potential (V-phon) of cathodic photocurrent is positively shifted by 530-540 mV to 0.44-0.45 V vs RHE, and the short-circuit current density (J(sc)) is up to 19.5 mA cm(-2) in neutral buffer solution under simulated 1 sun illumination. Impressively, the half-cell photopower conversion efficiencies (eta(hc)) of the optimized Si-NWs/Co-B (2.53%) and Si-NWs/Ni-B (2.45%) are comparable to that of Si-NWs/Pt (2.46%). In terms of the large J(sc), V-phon, and eta(hc) values, as well as the high Faradaic efficiency, Si-NW-s/M-B electrodes are among the top performing Si photocathodes which are modified with HER electrocatalysts but have no buried solid/solid junction.

Place, publisher, year, edition, pages
American Chemical Society , 2016. Vol. 8, no 44, 30143-30151 p.
Keyword [en]
cobalt boride, nickel boride, silicon, photocathode, hydrogen evolution reaction, photoelectrochemical catalysis
National Category
Chemical Sciences
URN: urn:nbn:se:kth:diva-197773DOI: 10.1021/acsami.6b09600ISI: 000387737200035ScopusID: 2-s2.0-84994877274OAI: diva2:1060699

QC 20161229

Available from: 2016-12-29 Created: 2016-12-08 Last updated: 2016-12-29Bibliographically approved

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