固体电解质电解池一氧化碳电催化还原反应研究

以α-Zr(HPO4)H2O为质子固体电解质设计电解池, 于常温常压实现了CO电催化加氢还原反应, 反应产物与电极材料、 电流密度密切相关. Cu/ZrP电极表面反应主要产物是甲醛, 电流密度100 mA/cm2时, 甲醛的Faradic效率达到29.0 %, Fe/ZrP电极表面反应主要产物是乙烯, 电流密度100 mA/cm2-时, 乙烯的Faradic效率达到15.0%.

Electrocatalytic Reduction of Carbon Monoxide on Cu, Fe, Brass Electrode in Solid Electrolyte Cells

A new electrolysis system was developed for the conversion of CO to formaldehyde and ethylene, in which the electrochemical reduction took place at the two-phase(gas/solid) interface on Cu, Fe and Brass electrodes with α-Zr(HPO4)2H2O(ZrP) used as proton-conducting solid electrolyte at room temperature and atmospheric pressure. The products for eletroreduction of CO depended on the different metal electrodes and the current densities. Considerable faradic efficiency was observed for HCHO at Cu/ZrP cathode electrode over a wide range of current density. And the faradic efficiency of HCHO increased with the increase of the current density and approached 29.0% at a current density of 100 mA·cm-2. The Cu/ZrP cathodic surface reaction mechanism was proposed, i.e., oxygencon-taining Cu…HCO was formed and the fine product HCHO was obtained. The faradic efficiency of C2H4 increased with the increase of the current density and approached 15.0% at a current density of 100 mA·cm-2 on Fe/ZrP cathode electrode. The Fe/ZrP surface reaction mechanism was proposed, that was, radical coordinate Fe…H2 was formed and the product C2H4 was obtained.