Carbon-supported Pt0.75M0.25 (M = Ni or Co) electrocatalysts for borohydride oxidation

• Type: Article in International Scientific Journal
• Date: 2013

Authors

Sljukic, B (Author) Other; Milikic, J (Author) Other; Sequeira, CAC (Author) Other

Journal

Title: Electrochimica Acta

Vol. 107

Pages: 577-583

ISSN: 0013-4686

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 44 Citations

Scopus - 58 Citations

Other information

Authenticus ID: P-008-E4R

DOI: 10.1016/j.electacta.2013.06.040

Abstract (EN): Electrochemical oxidation of sodium borohydride (NaBH4) at carbon-supported platinum (Pt/C) and carbon-supported bimetallic platinum alloys (Pt0.75M0.25/C, with M = Ni or Co) is studied in alkaline media using cyclic voltammetry and linear scan voltammetry with rotating disc electrode. Main kinetic parameters (e.g., charge transfer coefficients, number of electrons exchanged, standard heterogeneous rate constants and activation energies) for NaBH4 oxidation on these electrocatalysts are determined. Results indicate the highest catalytic activity of Pt0.75Ni0.25/C alloy electrocatalyst, followed by Pt0.75Co0.25/C, while the lowest activity is observed for Pt/C electrocatalyst. The influence of electrolyte composition and temperature on NaBH4 electrooxidation at the three materials is also explored. The good performance of these bimetallic alloys makes them a lower cost alternative to single Pt as electrocatalysts for the direct borohydride fuel cell anode.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7