Si/PEDOT hybrid core/shell nanowire arrays as photoelectrodes for photoelectrochemical water-splitting.

TitleSi/PEDOT hybrid core/shell nanowire arrays as photoelectrodes for photoelectrochemical water-splitting.
Publication TypeJournal Article
Year of Publication2013
AuthorsLi X, Lu W, Dong W, Chen Q, Wu D, Zhou W, Chen L
JournalNanoscale
Volume5
Issue12
Pagination5257-61
Date Published2013 Jun 21
Abstract

Si/poly(3,4-ethylenedioxythiophene) (PEDOT) core/shell nanowire arrays have been prepared by chemical etching of Si nanowires followed by vapor-phase polymerization of PEDOT as hybrid photoanodes for photoelectrochemical water-splitting. The PEDOT layer is employed as a multi-functional coating to prevent photocorrosion of Si nanowires, collect photogenerated holes and catalyze the water oxidation reaction. The amino silane modified Si nanowire surface improves PEDOT layer adhesion, and the resulting photoanode exhibits better photoresponse and improved stability. By tuning the length of the nanowires, we identify that the competition between the carrier recombination and catalytic water oxidation reaction is the primary factor determining the photoelectrocatalytic activity of the hybrid photoanode.

DOI10.1186/2090-5009-9-1
Alternate JournalNanoscale