Generation of an electromotive force by hydrogen-to-water oxidation with Pt-coated oxidized titanium foils

✍ Scribed by Schierbaum, Klaus ;El Achhab, Mhamed

• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 568 KB
• Volume: 208
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.201127400

✦ Synopsis

Abstract

We show that chemically induced current densities up to 20 mA cm^−2^ and an electromotive force (EMF) up to 465 mV are generated during the hydrogen‐to‐water‐oxidation over Pt/TiO~2~/Ti devices. We prepare the samples by plasma electrolytic oxidation (PEO) of titanium foils and deposition of Pt contact paste. This process yields porous structures and, depending on the anodization voltage, Schottky diode‐type current–voltage curves of various ideality parameters. Our experiments demonstrate that Pt coated anodized titanium can also be utilized as hydrogen sensor; the system offers a number of advantages such as a wide temperature range of operation from −40 to 80 °C, quick response and decay times of signals, and good electrical stability.

Idealized sketch of the Pt coated anodized Ti foil and application as hydrogen sensor and electric generator. magnified image