一种新的测定微粒的电化学技术

设计了一种由2个石墨电极短路相连组成工作电极的新的电化学池装置.操作时首先通过外力按压使极少量固体微粒粘附在其中一个石墨电极表面上,然后在溶液存在下将微粒夹紧并固定在2个石墨电极表面之间进行电化学测定.电化学转化过程中生成的可溶性物质被封闭在2个石墨电极表面之间而得到测定.用该技术对钯沉积在氧化铝上而组成的催化剂的电化学行为以及黄铁矿的电化学行为进行了研究.结果表明,其兼具可电解粘合剂碳糊电极和固体微粒伏安法(voltammetry of microparticles)技术的优点而避免了各自的缺点:即不使用粘合剂,从而消除了粘合剂中杂质产生的氧化或还原电流的影响;可测定电化学转化过程中生成的可溶性物质;分辨率好、易于操作.

A New Electrochemical Technique for the Particles Characterization

Two graphite electrodes were short circuit as working electrodes for the new electrochemical cell.A small amount of solid particles were fixed on one surface of the two graphite electrodes by simple mechanical pressure.In the presence of the solution,the particles were closed between the surfaces of the two graphite electrodes and its electrochemical behavior was studied.The soluble substances which were formed during the electrochemical transformation would be closed between the surfaces of the two graphite electrodes.Therefore,these soluble substances would be characterized.The electrochemical behavior of a palladium catalyst and pyrite were studied by this new technique.The result showed that the new technique combined the advantages and eliminated the shortcomings of the carbon paste electrodes with electrolytic binder and the voltammetry of microparticles.And,the interference of oxidation current or reduction current from the impurities in the binder was eliminated for the avoid use of the binder in the new technique.This technique could characterize those soluble substances formed during the electrochemical transformation with good resolution and simple operation.