Mechanistic Study of Palladium Based Electrocatalysts for Direct Borohydride Oxidation
Herein we present an extensive study of Palladium based catalysts for the anode reaction of DBFCs (see reaction 1) including several electrochemical experiments supported by 11B-NMR and FTIR measurements.
BH4- + 8OH- → BO2- + 6H2O + 8e- (1)
(E0 = -1.24 V vs. SHE)
Palladium based electrocatalysts nanodispersed on high surface area carbon are prepared by reduction of precursor salts in an aqueous dispersion of the support material. The catalyst is characterized by transition electron microscopy (TEM).
Rotating disk electrode (RDE) and rotating ring disk electrode (RRDE) experiments with subsequent analysis of reaction products by 11B-NMR are conducted. Fig. 1 shows a typical result of Pd/C on a RDE with a borohydride concentration of 5 mM. Additionally mechanistic aspects on Palladium are investigated employing in-situ FTIR spectroscopy .
By combining all results obtained from the experiments mentioned above a substantial proposition of ongoing mechanisms of BH4--electrooxidation on Palladium is presented.
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