基于罗勒叶提取物介导的CuCo2S4/CuS/MnS复合电极在超级电容器应用中的电化学性能提升

CuCo 2 S 4, CuS/MnS, CuCo 2 S 4 /CuS/MnS electrodes were synthesized via co-precipitation method using Ocimum gratissimum leaf extract for energy storage application. The electrochemical properties of CuCo 2 S 4 /CuS/MnS were assessed in comparison with CuCo 2 S 4 and CuS/MnS electrodes. The structural, morphological, and electrochemical properties of the electrodes were investigated using XRD, SEM, EDS, CV, GCD, and EIS. The structural result shows that there is decrease in the crystallite size (24.0–16.6 nm) as well as dislocation density and micro-strain for the formed composite. The optical studies reveal that there is decrease in the band gap energy (2.43–2.36 eV) for CMCS composite, while the morphology was observed to be spherical and dense irregular shapes in CMS; nanospheres tend to agglomeration with pores for CCS, while CMCS shows cluster of dense nanospheres of different sizes with obvious open pores. BET surface area calculated for CCS, CMS, and CMCS were 83.2, 74.6, and 96.7 m 2 /g, respectively. Electrochemically, in 1.0 M of KOH, the electrodes were tested in three-electrode configurations. The highest specific capacitance calculated was 2156.0, 2512.5, and 3169.7 F/g at 1.0 A/g for CMS, CCS, and CMCS with about 84.4% retention for CMCS after 5000 cycles with calculated energy density of 281.8 Wh/kg and power density of 2.5 kW/kg. The results suggest that CuCo 2 S 4 /CuS/MnS has a great deal of promise for real-world uses in the energy storage industry.