On the enhanced electrocatalytic performance of PtAu alloys in borohydride oxidation
作者： P.I. Iotov , S.V. Kalcheva , I.A. Kanazirski
DOI: 10.1016/J.ELECTACTA.2013.06.132
关键词: Linear sweep voltammetry 、 Reaction rate constant 、 Adsorption 、 Borohydride 、 Supporting electrolyte 、 Activation energy 、 Sodium borohydride 、 Inorganic chemistry 、 Alloy 、 Chemistry
摘要: Abstract The initial steps of sodium borohydride oxidation are studied at PtAu alloy electrodes Au bulk content 20, 40, 60 and 80 at.%. Linear sweep voltammetry is applied in 0.01 M NaBH 4 1.00 M NaOH varying the scan rate applied. experiments performed four temperature values interval from 293.2 K to 323.2 K. data obtained compared those referring Pt as well. standard constant characterizing first anodic peak determined. apparent activation energy process evaluated its dependence on alloys surface composition followed. It found that lowest expected case an ca 45 at.%. total number electrons exchanged during found. 1 for most indicating anion adsorption determines considered. For 20 at.% it 1.2 1.3, respectively. latter point fact refers followed by electrooxidation with participation supporting electrolyte's hydroxide anions, while can be attributed two-step formation adsorbed species containing BOH H. enhanced electrocatalytic performance when ascribed electronic effect resulting decrease B H bonding strength unalloyed Pt. Experimental evidence provided finding weakly participate reaction determining 60 at.%.
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