CO_(2)电催化还原的研究(Ⅱ)——金属卟啉在不同条件下的电催化活性

Investigation of the Electrocatalytic Reduction of Carbon Dioxide (Ⅱ)——The Electrocatalytic Activity of Metallo-Porphyrins Under Different Conditions

在研究了碘化四-(4-三甲胺苯基)卟啉合钴(Co(Ⅱ)[p-N(CH_(3))_(3)]TPPl)对CO_(2)还原的电催化活性的基础上,我们展开了对镍、铜、锌等金属卟啉对CO_(2)电催化还原影响的研究。(一)试剂Me(Ⅱ)[p-N(CH_(3))_(3)]TPPI(Me(Ⅱ):CO^(2+)、Ni^(2+)、Cu^(2+)、Zn■)由本实验室合成。所用试剂均为分析纯,制做电极用的金属纯度皆达99.99%。二次蒸馏水。CO_(2)的净化同文献。

The catalytic activity of several water-soluble metallo-porphyrin complexes, M(Ⅱ)[p-N(CH_(3))_(3)]TPPI (M = Co, Ni, Cu, Zn;[p-N(CH_(3))_(3)]TPPI = tetrakis (4-trimethylammoniophenyl) porphyrin iodide), for the electroreduction of CO_(2) has been studied by means of controlled-potential electrolysis in aqueous solutions. It was found that Co( Ⅱ )[p-N(CH_(3))_(3)]TPPI is active but other metalloporphyrins show no activity. In the presence of Co( Ⅱ )[p-N(CH_(3))_(3)]TPPl the main product of CO_(2) reduction was CO, but small amounts of HCOOH were obtained. The effects of electrolytes, catalyst concentrations, electrode materials and potentials on the reduction of CO_(2) were investigated.