Improvement in Hydrogen Photoevolution Efficiency for Platinum-Deposited Indium Phosphide Electrodes by the Removal of Surface States

Autor:	Y. Nakato, Fumiaki Mizuno, Hikaru Kobayashi
Rok vydání:	1994
Předmět:	Materials science Hydrogen Inorganic chemistry General Engineering General Physics and Astronomy chemistry.chemical_element Photoelectrochemical cell Electrochemical cell chemistry.chemical_compound chemistry Electrode Indium phosphide Platinum Dissolution Surface states
Zdroj:	Japanese Journal of Applied Physics. 33:6065
ISSN:	1347-4065 0021-4922
DOI:	10.1143/jjap.33.6065
Popis:	Hydrogen photoevolution has been performed using minute platinum (Pt)-island-deposited p-InP electrodes in an HClO4 solution. The photovoltage for the as-prepared electrodes is low, but is increased by about 0.5 V after anodic dissolution. The electrode capacitance is decreased by sweeping the potential in the region where the anodic dissolution occurs, while it is almost unchanged with the potential sweep in the region where dissolution does not occur. These results indicate that the surface states are removed by the anodic dissolution, leading to the increase in the photovoltage. The Mott-Schottky plot is nominally changed by the anodic dissolution, unlike the current-voltage curves. This unusual result can be explained by the presence of high- and low-energy barrier regions in the InP surface before anodic dissolution, the former area being much larger than the latter.
Databáze:	OpenAIRE
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