Semiconductor Electrodes. 27. The p- and n-GaAs- N,N'-Dimethyl-4,4'-Bipyridinium System. Enhancement of Hydrogen Evolution on p-GaAs and Stabilization of n-GaAs Electrodes.
Abstract
The photoelectrochemical (PEC) behavior of N,N'-dimethyl-4,4'-bipyridinium (methyl viologen,MV (2+) at p- and n-type GaAs electrodes in aqueous solutions was studied. The reduction of MV(2+) at irradiated p-GaAs occurs at potentials approx. 450 mV less negative than those found at Pt electrode. The catalyzed reaction of the Photogenerated MV with water to produce hydrogen by irradiation of p-GaAs was demonstrated and the use of the MV-system as an intermediate in the photoassisted generation of hydrogen at semiconductors with high hydrogen over potentials suggested. The photooxidation of MV at n-GaAs occurred at potentials approx. 0.8 V less positive to those where the oxidation takes place at Pt. PEC cells of the form n-GaAs or p-GaAs/MV(2+),MV/M were also constructed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1979
- Accession Number
- ADA075813
Entities
People
- Allen J. Bard
- Benjamin Reichman
- Fu-ren F. Fan
Organizations
- University of Texas at Austin