In this presentation, the results of recent experimental studies about the BOR on gold and platinum electrodes will be presented and discussed with the help of microkinetic modeling. The proposed kinetic model is able to reproduce the main features of electrochemical (rotating (ring-)disk electrode, RRDE) and differential electrochemical mass-spectrometry (DEMS) measurements for various concentrations of NaBH4 (5, 50 and 500 mM), and is in agreement with the results of DFT calculations and FTIR measurements [5-8]. These experimental findings enable to compare and discuss the BOR mechanism between Pt and Au surfaces accounting for the differences in hydrogen generation/oxidation during the BOR but also for the poisoning of the electrodes with adsorbed BOR intermediates.
This work was supported by the French ANR (project ANR-16-CE05-0009).
(1) Jusys, Z.; Behm, R. J. Electrochem. Commun. 2015, 60, 9.
(2) Freitas, K. S.; Concha, B. M.; Ticianelli, E. A.; Chatenet, M. Catal. Today 2011, 170, 110.
(3) Olu, P.-Y.; Job, N.; Chatenet, M. J. Power Sources 2016, 327, 235.
(4) Olu, P. Y.; Bonnefont, A.; Rouhet, M.; Bozdech, S.; Job, N.; Chatenet, M.; Savinova, E. Electrochim. Acta 2015, 179, 637.
(5) G. Rostamikia, M.J. Janik, J. Electrochem. Soc., 2009, 156 B86.
(6) G. Rostamikia, M.J. Janik, Electrochim. Acta, 2010, 55, 1175.
(7) B. Molina Concha, M. Chatenet, F. Maillard, E.A. Ticianelli, F.H.B. Lima, R.B. de Lima, Phys. Chem. Chem. Phys., 2010, 12, 11507.
(8) B. Molina Concha, M. Chatenet, E.A. Ticianelli, F.H.B. Lima, J. Phys. Chem. C, 2011, 115 12439.