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运用电化学循环伏安、原位FTIR反射光谱和石英晶体微天平(EQCM)等方法研究了碱性介质中异丙醇在Pt电极表面吸附和氧化行为.结果表明:碱性介质中异丙醇电氧化过程不存在自毒化现象.虽然电化学原位FTIR反射光谱未能检测到CO等毒性物种,但EQCM结果证明异丙醇或其解离产物吸附于铂电极上.在实验条件下,碱性介质中异丙醇在铂电极上氧化的最终产物只有丙酮,预示着碱性介质中异丙醇通过脱氢步骤氧化成丙酮.EQCM研究还从电极表面质量定量变化的角度提供了异丙醇吸附和电氧化反应机理的新数据.
The adsorption and oxidation behaviors of isopropanol on Pt electrode in alkaline medium were investigated by electrochemical cyclic voltammetry, in-situ FTIR reflectance spectroscopy and quartz crystal microbalance (EQCM). The results showed that the isopropanol There was no self-poisoning in the electro-oxidation process.Although the electrochemical in situ FTIR spectroscopy failed to detect CO and other toxic species, EQCM results showed that isopropanol or its dissociation products adsorbed on the platinum electrode.In the experimental conditions, The only product of oxidation of isopropanol on platinum electrode in the presence of acetone is acetone, which indicates that isopropanol in alkaline medium is oxidized to acetone by dehydrogenation step.The EQCM study also provides isopropanol from the viewpoint of the quantitative change of electrode surface quality New Data on Adsorption and Electrooxidation Reaction Mechanisms.