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Influence of Halide Ions on Anodic Oxidation of Ethanol on Palladium

机译:卤离子对乙醇在钯上阳极氧化的影响

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Ethanol oxidation on polycrystalline palladium electrodes in alkaline media was studied in the presence of halide ions. Addition of halide ions decreased the ethanol oxidation peak current monotonically as a function of increasing halide concentration. The extent of poisoning was found to be in the order I- > Br- > Cl-. Thus, Cl- ions show appreciable inhibition of ethanol oxidation peak current at [Cl-] similar to 10(-3) M, whereas Br- and I- inhibit ethanol oxidation even at [Br-] or [I-] similar to 10(-6) M. The potential of the ethanol oxidation peak shifted positive with increasing halide ion concentration. The extent of the shift was found to be in the order I- > Br- > Cl-. This study is relevant due to the widespread use of palladium halide complexes in the production of Pd electrocatalysts for ethanol oxidation and other electrocatalytic reactions.
机译:在卤化物离子存在下,研究了碱性介质中多晶钯电极上的乙醇氧化。卤化物离子的添加​​随着卤化物浓度的增加而单调降低乙醇氧化峰电流。发现中毒程度为I-> Br-> Cl-。因此,Cl-离子在[Cl-]处显示出对乙醇氧化峰值电流的明显抑制,类似于10(-3)M,而Br-和I-甚至在[Br-]或[I-]处也显示出对乙醇氧化的抑制,类似于10(-3)M。 (-6)M。乙醇氧化峰的电位随着卤化物离子浓度的增加而正移。发现位移的程度为I-> Br-> Cl-。由于卤化钯配合物在乙醇氧化和其他电催化反应的Pd电催化剂生产中的广泛使用,因此这项研究具有重要意义。

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