离子膜金电极上的氧还原和一氧化碳氧化

用化学还原法在Nafion-117型阳离子交换膜上结合薄层金，制成固体聚合物电解质薄膜上的金电极(Au-SPE)。用电位扫描法考察了电极在酸、碱性溶液中电流与电位的关系，测定了氧还原为过氧化氢的电流效率，发现氧还原过程受阴极液中溶解氧的传质过程所控制。用碱液中的Au-SPE电极对空气中的一氧化碳进行电氧化和检测，得知在相对于相同碱液浓度的Hg／HgO参此电极0．3V的电位下，所产生氧化电流的极限值与一氧化碳含量的百分数相关。电极有被一氧化碳暂时中毒的现象。

Reduction of Oxygen and Oxidation of Carbon Monoxide at the Gold Electrode Bonded on Ion Exchange Membrane

The gold electrode bonded on Nafion-117 ion exchange membrane (Au-SPE)was prepared by the reduction of HAuCl_4. The voltammetric relation of the Au-SPE electrodewas measured by the potential sweep method in the acid and in the alkaline solutiom,separately.The current efficiencies of the reduction of O_2 to H_2O_2 were also determined in the acid solutionand in the alkaline solution, separately.It was discovered that the electro-reduction processis controlled by the masstransfer proccss of the dissolved oxygen in the solution of the cathodiccompaitment.The proper potential for tbe electiooxidation and the detection of CO in air is,0.3 V vs. Hg/HgO reference electrode. The limitting oxidation currents were correlated tothe percentage concentrations of CO in air.The tempolary poison of the Au-SPE electrode byCO existed.