Bulakhe Ravindra N, Nguyen Anh Phan, Ryu Changyoung, Kim Ji Man, In Jung Bin
Soft Energy Systems and Laser Applications Laboratory, School of Mechanical Engineering, Chung-Ang University, Seoul 06974, Republic of Korea.
Department of Chemistry, Sungkyunkwan University, Suwon 16419, Republic of Korea.
Materials (Basel). 2023 Oct 8;16(19):6598. doi: 10.3390/ma16196598.
This study describes the single-step synthesis of a mesoporous layered nickel-chromium-sulfide (NCS) and its hybridization with single-layered graphene oxide (GO) using a facile, inexpensive chemical method. The conductive GO plays a critical role in improving the physicochemical and electrochemical properties of hybridized NCS/reduced GO (NCSG) materials. The optimized mesoporous nanohybrid NCSG is obtained when hybridized with 20% GO, and this material exhibits a very high specific surface area of 685.84 m/g compared to 149.37 m/g for bare NCS, and the pore diameters are 15.81 and 13.85 nm, respectively. The three-fold superior specific capacity of this optimal NCSG (1932 C/g) is demonstrated over NCS (676 C/g) at a current density of 2 A/g. A fabricated hybrid supercapacitor (HSC) reveals a maximum specific capacity of 224 C/g at a 5 A/g current density. The HSC reached an outstanding energy density of 105 Wh/kg with a maximum power density of 11,250 W/kg. A 4% decrement was observed during the cyclic stability study of the HSC over 5000 successive charge-discharge cycles at a 10 A/g current density. These results suggest that the prepared nanohybrid NCSG is an excellent cathode material for gaining a high energy density in an HSC.
本研究描述了一种介孔层状硫化镍铬（NCS）的单步合成方法，以及使用简便、廉价的化学方法将其与单层氧化石墨烯（GO）进行杂化。导电的GO在改善杂化NCS/还原氧化石墨烯（NCSG）材料的物理化学和电化学性质方面起着关键作用。当与20%的GO杂化时，可获得优化的介孔纳米杂化物NCSG，与裸NCS的149.37 m²/g相比，该材料具有685.84 m²/g的非常高的比表面积，且孔径分别为15.81和13.85 nm。在2 A/g的电流密度下，这种最佳NCSG（1932 C/g）的比容量比NCS（676 C/g）高出三倍。制备的混合超级电容器（HSC）在5 A/g的电流密度下显示出224 C/g的最大比容量。该HSC达到了105 Wh/kg的出色能量密度和11250 W/kg的最大功率密度。在10 A/g的电流密度下对HSC进行5000次连续充放电循环的循环稳定性研究期间，观察到有4%的下降。这些结果表明，所制备的纳米杂化物NCSG是一种用于在HSC中获得高能量密度的优异阴极材料。
