氮掺杂多孔碳负载铜钴纳米复合材料的制备及其电催化性能EI北大核心CSCD

先以ZIF-8作为前驱体采用简单的高温炭化法制备出氮掺杂多孔碳纳米多面体(NPC),再通过一步化学还原法将铜和钴颗粒负载到多孔碳上,成功制备出Cu@Co/NPC纳米复合材料。运用X射线粉末衍射仪、透射电子显微镜和X射线光电子能谱等手段对复合材料进行表征,将该复合材料修饰到玻碳电极表面上,研究其对肼的电化学响应。结果表明,Cu@Co/NPC纳米复合材料发挥出协同作用,从而对肼展现出比单一组分修饰电极更优异的电催化作用。在优化的实验条件下,复合材料修饰电极与肼的浓度在5~1850μmol/L范围内呈良好的线性关系,检测限达0.08μmol/L。此外,该复合材料修饰电极测定肼的稳定性、重现性以及选择性均较好,已被成功用于环境水样中肼的检测,结果令人满意。

Preparation and electrocatalytic properties of nitrogen doped porous carbon loaded copper and cobalt nanocomposite

Nitrogen doped porous carbon nanopolyhedra (NPC) derived from ZIF-8 was firstly prepared by high temperature carbonization. Subsequently, copper and cobalt were decorated on NPC to form novel nanocomposite by one-step chemical reduction method. Cu@Co/NPC hybrid material was characterized using X-ray powder diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. The composite was modified on the surface of glassy carbon electrode to study its electrochemical response to hydrazine. The results show that Cu@Co /NPC nanocomposites play a synergistic role, which shows better electrocatalytic effect on hydrazine than single component modified electrode. Under the optimum conditions, the concentration of composite modified electrode and hydrazine in the range of 5-1850 μmol/L exhibits good linear relationship, and the detection limit is 0.08 μmol/L. In addition, the composite modified electrode has good stability, reproducibility and selectivity for the determination of hydrazine. It has been successfully used for the determination of hydrazine in environmental water samples with satisfactory results.