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 language | English |
|---|---|
| Pages (from-to) | 467-482 |
| Number of pages | 16 |
| Journal | Journal of the American Chemical Society |
| Volume | 104 |
| Issue number | 2 |
| Publication status | Published - Jan 1 1982 |
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ASJC Scopus subject areas
- Chemistry(all)
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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 journal › Article
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TY - JOUR
T1 - IMPROVEMENT OF PHOTOELECTROCHEMICAL HYDROGEN GENERATION BY SURFACE MODIFICATION OF p-TYPE SILICON SEMICONDUCTOR PHOTOCATHODES.
AU - Dominey, Raymond N.
AU - Lewis, Nathan S
AU - Bruce, James A.
AU - Bookbinder, Dana C.
AU - Wrighton, Mark S.
PY - 1982/1/1
Y1 - 1982/1/1
N2 - 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.
AB - 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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M3 - Article
VL - 104
SP - 467
EP - 482
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 2
ER -