title: Platinum monolayer electrocatalyst on gold nanostructures on silicon for photoelectrochemical hydrogen evolution.
abstract: Pt monolayer decorated gold nanostructured film on planar p-type silicon is utilized for photoelectrochemical H2 generation in this work. First, gold nanostructured film on silicon was spontaneously produced by galvanic displacement of the reduction of gold ion and the oxidation of silicon in the presence of fluoride anion. Second, underpotential deposition (UPD) of copper under illumination produced Cu monolayer on gold nanostructured film followed by galvanic exchange of less-noble Cu monolayer with more-noble PtCl6(2-). Pt(shell)/Au(core) on p-type silicon showed the similar activity with platinum nanoparticle on silicon for photoelectrochemical hydrogen evolution reaction in spite of low platinum loading. From Tafel analysis, Pt(shell)/Au(core) electrocatalyst shows the higher area-specific activity than platinum nanoparticle on silicon demonstrating the significant role of underlying gold for charge transfer reaction from silicon to H(+) through platinum catalyst.
authors.affiliation: Department of Chemistry, Myongji University, Yongin 449-728, Republic of Korea.
authors.forename: Joohong
authors.initials: J
authors.lastname: Kye
authors.forename: Muncheol
authors.initials: M
authors.lastname: Shin
authors.forename: Bora
authors.initials: B
authors.lastname: Lim
authors.forename: Jae-Won
authors.initials: JW
authors.lastname: Jang
authors.forename: Ilwhan
authors.initials: I
authors.lastname: Oh
authors.forename: Seongpil
authors.initials: S
authors.lastname: Hwang
mesh_terms: D002384:Catalysis; D004563:Electrochemistry / Q000295:instrumentation; D004566:Electrodes; D004574:Electromagnetic Fields; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006046:Gold / Q000737:chemistry* / Q000528:radiation effects; D006859:Hydrogen / Q000737:chemistry* / Q000302:isolation & purification; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000528:radiation effects; D010777:Photochemistry / Q000295:instrumentation; D010984:Platinum / Q000737:chemistry* / Q000528:radiation effects; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water; D010984:Platinum; D006046:Gold; D006859:Hydrogen