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

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

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。

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 5-1850μmol/L exhibits good linear relationship,and the detection limit is 0.08μmol/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.