Nanoporous gold anode catalyst for direct borohydride fuel cell
Nagle, Lorraine C.
Rohan, James F.
Nanoporous gold (NPG) electrodes were fabricated in film and wire array formats by selectively dealloying Ag from Au0.18Ag0.82. Borohydride oxidation reaction (BOR) was studied by cyclic voltammetry at the NPG electrodes. The onset potential for the oxidation at NPG in a wire array format shifted to more negative potentials that than observed at an Au disc and higher currents were realized. An onset potential of −1.07 V vs SCE which is 0.207 V lower than that at an Au disc was recorded. The oxidation current for 20 mM borohydride in 1 M NaOH increased to 73.6 mA cm−2 from 3.17 mA cm-2 at an Au disc. An n value of 7.49 was determined for the oxidation peak at high potential (−0.49 V) while a value of 4.26 was determined at low potential for the oxidation plateau centered at −0.05 V. NPG presents an attractive alternative to gold nanoparticle-based catalysts for use in direct borohydride fuel cells. NPG can establish intimate contact with an electrical substrate and eliminates the need for a carbon support.
Gold , Borohydride , Nanoporous gold , Direct borohydride fuel cell
Nagle, Lorraine C.,Rohan, James F. (2011) 'Nanoporous gold anode catalyst for direct borohydride fuel cell'. International Journal of Hydrogen Energy, 36 (1616):10319-10326.
NOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Hydrogen Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Hydrogen Energy, [Volume 36, Issue 16, August 2011] DOI: http://dx.doi.org/10.1016/j.ijhydene.2010.09.077