Diminished electron transfer kinetics for [Ru(NH3)6]3+/2+, [α-SiW12O40]4-/5-, and [α-SiW12O40]5-/6- processes at boron-doped diamond electrodes

Kiran Bano, Jie Zhang, Alan Maxwell Bond, Patrick Robert Unwin, Julie V Macpherson

Research output: Contribution to journalArticleResearchpeer-review

16 Citations (Scopus)


Heterogeneous electron transfer rate constants (k0 values) at a boron-doped diamond (BDD) electrode (10-2 cm s-1 range) that are more than an order of magnitude smaller than found at metal or glassy carbon (GC) electrodes (≥2.0 cm s-1) are reported for the outer-sphere [Ru(NH3)6]3+/2+, [α-SiW12O40]4-/5-, and [α-SiW12O40]5-/6- redox couples in aqueous electrolyte media. The k0 values and other parameters relevant to electrode kinetics were derived from analysis of the higher-order harmonic components available in Fourier transformed large amplitude alternating current voltammetry at BDD, GC, and platinum (Pt) or gold (Au) electrodes for the reduction of highly positively charged [Ru(NH3)6]3+ and highly negatively charged Keggin-type silicon tungstate ([α-SiW12O40]4- and [α-SiW12O40]5-). The slower electron transfer kinetics at the BDD electrode, relative to the other electrode materials, are discussed in terms of the double layer, density of states, and other factors. (Chemical Equation Presented).
Original languageEnglish
Pages (from-to)12464-12472
Number of pages9
JournalJournal of Physical Chemistry C
Issue number22
Publication statusPublished - 2015

Cite this