IMPROVEMENT OF PHOTOELECTROCHEMICAL HYDROGEN GENERATION BY SURFACE MODIFICATION OF p-TYPE SILICON SEMICONDUCTOR PHOTOCATHODES.

Raymond N. Dominey, Nathan S Lewis, James A. Bruce, Dana C. Bookbinder, Mark S. Wrighton

Research output: Contribution to journalArticle

293 Citations (Scopus)

Abstract

The improvement of H//2 evolution from two different types of catalytic p-type photocathode surfaces has been examined. p-Type Si has been platinized by photoelectrochemically plating Pt(O) onto the Si surface. Such a photocathode shows significant improvement (compared to naked p-type Si) for photochemical H//2 evolution with respect to output photovoltage, fill factor, and overall efficiency. Such photocathodes having an optimum amount of Pt(O) give a pH-dependent output voltage with respect to the H//2O/H//2 couple, but the dependence is not a simple 59-mV/pH dependence. No pH dependence would be expected if Pt(O) formed a Schottky barrier when plated onto p-type Si. A second kind of H//2 evolution catalyst has been confined to the surface of p-type Si. Polymeric quantities of an electroactive N,N**'-dialkyl-4,4**'-bipyridinium reagent, (PQ**2** plus **/** plus **. )//n, have been confined to the surface. The Br** minus counterions of the polymer are then exchanged by PtCl//6**2** minus . Photoreduction then yields Pt(O) dispersed in the polymer. Such a surface is again significatnly improved compared to naked p-type Si with respect to H//2 evolution.

Original languageEnglish
Pages (from-to)467-482
Number of pages16
JournalJournal of the American Chemical Society
Volume104
Issue number2
Publication statusPublished - Jan 1 1982

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Semiconductors
Photocathodes
Silicon
Surface treatment
Hydrogen
Semiconductor materials
Polymers
Plating
Catalysts
Electric potential

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

IMPROVEMENT OF PHOTOELECTROCHEMICAL HYDROGEN GENERATION BY SURFACE MODIFICATION OF p-TYPE SILICON SEMICONDUCTOR PHOTOCATHODES. / Dominey, Raymond N.; Lewis, Nathan S; Bruce, James A.; Bookbinder, Dana C.; Wrighton, Mark S.

In: Journal of the American Chemical Society, Vol. 104, No. 2, 01.01.1982, p. 467-482.

Research output: Contribution to journalArticle

Dominey, Raymond N. ; Lewis, Nathan S ; Bruce, James A. ; Bookbinder, Dana C. ; Wrighton, Mark S. / IMPROVEMENT OF PHOTOELECTROCHEMICAL HYDROGEN GENERATION BY SURFACE MODIFICATION OF p-TYPE SILICON SEMICONDUCTOR PHOTOCATHODES. In: Journal of the American Chemical Society. 1982 ; Vol. 104, No. 2. pp. 467-482.
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abstract = "The improvement of H//2 evolution from two different types of catalytic p-type photocathode surfaces has been examined. p-Type Si has been platinized by photoelectrochemically plating Pt(O) onto the Si surface. Such a photocathode shows significant improvement (compared to naked p-type Si) for photochemical H//2 evolution with respect to output photovoltage, fill factor, and overall efficiency. Such photocathodes having an optimum amount of Pt(O) give a pH-dependent output voltage with respect to the H//2O/H//2 couple, but the dependence is not a simple 59-mV/pH dependence. No pH dependence would be expected if Pt(O) formed a Schottky barrier when plated onto p-type Si. A second kind of H//2 evolution catalyst has been confined to the surface of p-type Si. Polymeric quantities of an electroactive N,N**'-dialkyl-4,4**'-bipyridinium reagent, (PQ**2** plus **/** plus **. )//n, have been confined to the surface. The Br** minus counterions of the polymer are then exchanged by PtCl//6**2** minus . Photoreduction then yields Pt(O) dispersed in the polymer. Such a surface is again significatnly improved compared to naked p-type Si with respect to H//2 evolution.",
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