基于ZIFs合成的中空双金属(Zn,Co)S纳米晶及其赝电容性质研究

通过两步法设计合成了具有中空结构的双金属硫化物（Zn，Co）S纳米晶，并研究了其电化学性质.首先在室温下，以水为溶剂，十六烷基三甲基溴化铵为表面活性剂，利用Zn²⁺，Co²⁺与2-甲基咪唑的配位作用形成了ZIF-Zn，Co.然后以ZIF-Zn，Co为自牺牲模板剂，加入硫代乙酰胺，在微波辐射下快速合成了具有中空结构的（Zn，Co）S纳米晶.电化学测试结果表明，在电流密度为3 mA/cm²时，（Zn，Co）S纳米晶比电容为423.3 F/g，在电流密度为10 mA/cm²时，充放电2000次，仍能保持59%的初始电容.所制备的中空纳米结构具有较高的比表面积和较好的电化学性能，可作为超级电容器的电极材料.

Facile Synthesis of ZIFs-derived Hollow Bimetal (Zn,Co)S Nanocrystals for Supercapacitors

A simple two-step method was introduced to synthesize uniform and hollow (Zn,Co)S nanostructures.Firstly, the bimetal compound ZIF-Zn,Co(ZIF=zeolitic imidazolate frameworks) with metal ions(Zn2+ and Co2+) and ligand(2-methylimidazole) was obtained using deionized water as solvent, hexadecyltrimethylammonium bromide(CTAB) as capping agent under stirring at room temperature.Secondy, hollow (Zn,Co)S nanostructures were synthesized by selecting ZIF-Zn,Co as self-sacrificial template and adding thioacetamide(TAA) as sulfate source under the microwave-assisted heating condition.The electrochemical measurements show that the specific capacitance of the as-made hollow (Zn,Co)S nanostructures was 423.3 F/g at current density of 3 mA/cm2 and 57% capacitance remains after 2000 cycles at a current density of 10 mA/cm2.With the advantages of unique properties, such as high surface area and good electrochemical performance, the as-made hollow (Zn,Co)S nanostructures have great potential as electrode material for supercapacitors.