Wang Haiyang, Wang Jinlong, Liang Miaomiao, He Zemin, Li Kexuan, Song Wenqi, Tian Shaopeng, Duan Wenyuan, Zhao Yuzhen, Miao Zongcheng
Key Laboratory of Organic Polymer Photoelectric Materials, School of Sciences, Xi'an Key Laboratory of Advanced Photo-Electronics Materials and Energy Conversion Device, Xijing University, Xi'an 710123, China.
ACS Omega. 2021 Jul 8;6(28):17999-18007. doi: 10.1021/acsomega.1c01717. eCollection 2021 Jul 20.
NiS/NiO nanoparticles are successfully fabricated through a simple dealloying method and an ion-exchange process. X-ray diffraction demonstrates the existence of NiO and NiS phases, and scanning electron microscopy and transmission electron microscopy imply the nanopore distribution nature and the nanoparticle morphology of the produced material. The electrochemical behaviors are studied by cyclic voltammetry and galvanostatic charge-discharge measurements. The NiS/NiO electrode shows an enhanced specific capacitance of 1260 F g at a current density of 0.5 A g. The NiS/NiO//AC device provides a maximum energy density of 17.42 W h kg, a high power density of 4000 W kg, and a satisfactory cycling performance of 93% capacitance retention after 30,000 cycles.
通过一种简单的脱合金方法和离子交换过程成功制备了硫化镍/氧化镍纳米颗粒。X射线衍射表明存在氧化镍和硫化镍相，扫描电子显微镜和透射电子显微镜揭示了所制备材料的纳米孔分布特性和纳米颗粒形态。通过循环伏安法和恒电流充放电测量研究了其电化学行为。硫化镍/氧化镍电极在电流密度为0.5 A g时显示出增强的比电容，为1260 F g。硫化镍/氧化镍//活性炭器件提供了17.42 W h kg的最大能量密度、4000 W kg的高功率密度以及令人满意的循环性能，在30000次循环后电容保持率为93%。
