PHOTOGALVANIC EFFECTS WITH ANODIZED ZIRCONIUM AND NIOBIUM ELECTRODES
Attempts were made to elucidate the nature of photoeffects by studying anodized Zr and Nb electrodes. A freshly polished Zr electrode when immersed in solution showed an initial potential, relative to the reference electrode, of about -1.2 v. As oxide began to form on the electrode surface the potential became less negative. Zr electrodes that were anodized with formation voltages greater than 10 v exhibited potentials, relative to the reference electrode, of -- 0.03 to -0.06 v in the absence of illumination. Application of the Zr electrode of a positive polarization voltage, well below the film-formation voltage, produced a small current in the absence of illumination. A considerable larger steady current resulted from illumination of the electrode. Niobium electrodes that were anodized with formation voltages greater than 10 v exhibited behavior under illumination similar to that of Zr. However, differences between rest potentials and steady-state photopotentials were considerably lower and photocurrents were considerably greater with Nb. Both short-circuit photocurrents and photocurrents with positively polarized Nb electrodes were observed. Photocurrents decreased with increasing film thickness. (P.C.H.)
- Research Organization:
- Temple Univ., Philadelphia
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-18-000569
- OSTI ID:
- 4160034
- Journal Information:
- J. Electrochem, Soc., Journal Name: J. Electrochem, Soc. Vol. Vol: 110
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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