Ni(OH)_(2)/氮掺杂空心碳球复合材料的制备及电化学性能的研究

Preparation and Electrochemical Performance of Ni(OH)_(2)/Nitrogen-doped Hollow Carbon Spheres Composite

采用改进Stober法-化学沉淀法制备了Ni(OH)_(2)/氮掺杂空心碳球复合材料(Ni(OH)_(2)/NHCS)。通过X射线衍射(XRD)、透射电镜(TEM)和N 2吸附-脱附等手段对复合材料进行表征和分析,并采用电化学工作站对复合材料的电化学性能进行测试。研究结果表明:相比于纯Ni(OH)_(2)而言,NHCS有效抑制了Ni(OH)_(2)的聚集,从而提高了活性材料的利用率。同时,复合材料的中空结构有利于电解质离子的渗入而缩短电解质离子的传输路径,且降低界面电阻,从而有效提高了复合材料Ni(OH)_(2)/NHCS的电化学性能。Ni(OH)_(2)/NHCS在2 M KOH电解质中,电流密度为0.5 A g^(-1)时可表现出1085 F g^(-1)的高比电容。

Ni(OH)_(2)/nitrogen-doped hollow carbon spheres(Ni(OH)_(2)/NHCS)were synthesized via modified St ber-chemical precipitation method.The composite was characterized by XRD,TEM and N 2 sorption,and its electrochemical performance was tested using the electrochemical workstation.The result showed that compared with pure Ni(OH)_(2),NHCS could effectively inhibit the aggregation of Ni(OH)_(2)and improved the utilization ratio of the active material.Meanwhile,the hollow structure was conducive to the penetration of electrolyte ions and shortened the transmission path of electrolyte ions,which could decrease the interface resistance and effectively enhance the electrochemical performance of the Ni(OH)_(2)/NHCS composite.A high specific capacitance of 1085 F g^(-1) was achieved on the Ni(OH)_(2)/NHCS composite at a current density of 0.5 A g^(-1) in a 2 M KOH electrolyte.