NiS2纳米片的制备及其在非对称超级电容器中的应用

本文采用牺牲模板法，以Ni(OH)₂作为前驱体制备NiS₂. 通过对NiS₂进行XRD、EDS、BET、SEM及TEM等表征来研究NiS₂的元素组成及结构形貌. SEM及TEM结果显示前驱体及NiS₂均为纳米片结构. 电化学测试结果表明NiS₂存在着优秀的电容性能，在电流密度为1 A·g^-1时，NiS₂比电容能够达到1067.3 F·g^-1，同时具有高的倍率特性. 为了进一步探究NiS₂作为电活性材料的实用性，以NiS₂作为阳极材料，活性炭（AC）作为阴极组装成非对称超级电容器，在功率密度为0.8 kW·kg^-1，能量密度高达38.4 Wh·kg^-1，并且在3000次恒流充放电后，比电容依然保持93.7%.

Preparation of NiS2 nanosheet and its application in asymmetric supercapacitor

In this work, the NiS₂ nanosheets have been synthesized using Ni(OH)₂ as a precursor through a sacrificial template method. The microstructure and chemical composition of as-prepared NiS₂ were characterized by XRD, EDS, BET, SEM and TEM techniques. The results showed that both Ni(OH)₂ and NiS₂ were composed of nanoplates. The electrochemical tests revealed that NiS₂ exhibited the high specific capacitance of 1067.3 F•g^-1 at a current density of 1 A•g^-1 and excellent rate performance. Furthermore, in order to evaluate the practical application of NiS₂, an asymmetric supercapacitor, NiS₂ as the positive electrode and AC as the negative electrode, displayed high energy density of 38.4 Wh•kg^-1 with a power density of 0.8 kW•kg^-1. Meanwhile, the asymmetric supercapacitor showed a superior cycling performance and 93.7% of the specific capacitance was retained after 3000 charge-discharge cycles.