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TitleHighly-ordered silicon nanowire arrays for photoelectrochemical hydrogen evolution: an investigation on the effect of wire diameter, length and inter-wire spacing
Author(s)Thalluri, Sitaramanjaneya Mouli
Borme, Jerome
Xiong, Dehua
Xu, Junyuan
Li, Wei
Amorim, Isilda
Alpuim, P.
Gaspar, Joao
Fonseca, Helder
Qiao, Liang
Liu, Lifeng
Issue date8-Mar-2018
PublisherRoyal Society of Chemistry
JournalSustainable Energy & Fuels
CitationSustainable Energy Fuels, 2018,2, 978-982.
Abstract(s)Vertically-aligned, highly-ordered silicon nanowire (SiNW) array photocathodes are fabricated employing e-beam lithography followed by deep reactive ion etching (DRIE) of Si. The effect of structural parameters of SiNWs, including wire diameter, length and inter-wire spacing, on their photoelectrocatalytic hydrogen evolution performance has been systematically investigated. Within the range of dimensions under study, the SiNW photocathode with a wire diameter of 200 nm, a length of 1 μm and an inter-wire spacing of 175 nm shows the best performance exhibiting a maximal saturated photocurrent density of 52 mA cm−2 and an onset potential (@−1 mA cm−2) of −0.17 V versus reversible hydrogen electrode. These lithography-patterned SiNWs with homogeneous structural parameters can help establish an unobscured structure–activity relation and facilitate Si-based photoelectrode design.
Publisher version
AccessOpen access
Appears in Collections:CDF - CEP - Artigos/Papers (with refereeing)

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