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采用恒电位电解方法,分别在酸性和碱性两种饱和乙炔的水介质中,探讨了乙炔在铜/石墨阴极上(石墨上电沉积铜和石墨一铜层状嵌入物)的电催化还原和电引发聚合行为。电极对乙炔还原成乙烯表现较高活性和很高选择性(～99％,对气相产物)。对电极上活性组份Cu~0(或Cu′)与乙炔分子可能发生的σ—π活化作用和加氢方式进行了讨论。本文还运用现场与非现场Raman光谱技术,考察了在乙快还原的同时,电极表面上形成聚乙炔复盖物的情况,提出了一种电引发聚合机理,能较好地解释实验事实。
Electrocatalytic reduction of acetylene on copper / graphite cathodes (graphite electrodeposited copper and graphite-copper layered inlay) was investigated by potentiostatic electrolysis in aqueous medium of both acidic and basic saturated acetylene Electrically initiated polymerization behavior. The reduction of acetylene to ethylene by the electrode shows a higher activity and a high selectivity (~ 99% for gas phase products). The possible activation of σ-π and the hydrogenation of acetylene molecule by Cu ~ 0 (or Cu ’) on the electrode are discussed. In this paper, the on-site and off-site Raman spectroscopy was also used to investigate the formation of polyacetylene coatings on the surface of electrodes at the same time as the rapid reduction of B, and an electrical polymerization mechanism was proposed to explain the experimental results well.