Sodium borohydride determination by measurement of open circuit potentials

• Type: Article in International Scientific Journal
• Date: 2009

Authors

Sequeira, CAC (Author) Other

Journal

Title: Journal Of Electroanalytical Chemistry

Vol. 627

Pages: 1-8

ISSN: 1572-6657

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 20 Citations

Scopus - 22 Citations

Other information

Authenticus ID: P-003-MWM

DOI: 10.1016/j.jelechem.2008.12.009

Abstract (EN): Sodium borohydride has been gaining increasing interest as energy source for direct borohydride fuel cells. One of the difficulties in the research on borohydride-based systems is related to the knowledge of the borohydride concentration. When immersed in sodium borohydride alkaline solutions, some materials are characterised by electrode responses that allow monitoring the borohydride content. Thirteen materials are tested for this purpose using a simple and relatively precise potentiometric titration technique that may be applied for in situ analysis of a variety of borohydride solutions. Thermodynamic treatment of measured open circuit potentials helps defining the electrode processes, being supported by additional measurements in hydrogen saturated solutions with no borohydride present. Tested materials are classified according to their borohydricle response, which is higher for platinum, palladium, gold, copper, nickel, and graphite. For these selected materials a microelectrode array sensor for in situ borohydride monitoring is proposed.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8