Mesoporous Iron Family Element (Fe, Co, Ni) Molybdenum Disulfide/Carbon Nanohybrids for High-Performance...

As the demand for fuel continues to increase, the development of energy devices with excellent performance is crucial. Supercapacitors (SCs) are attracting attention for their advantages of high specific energy and a long cycle life. At present, the development of high-performance electrode materials is the main point for research and development of SCs. Transition metal sulfides have the advantages of a large interlayer space and high theoretical capacity, making them promising electrode materials. Herein, we reported a series of ultrathin mesoporous iron family element (Fe, Co, Ni) molybdenum disulfide (MMo_1-S₂/C, M = Fe, Co, and Ni) by a template method. The original monolayer mesoporous structure of MoS₂/C was maintained, and accumulation and agglomeration of MoS₂/C were avoided. Based on our investigations, the best performance was that of CoMo_1-S₂/C nanohybrids. Furthermore, the concentrations of Co and Mo ions were modulated to obtain the best performance, in which Mo and Co ions were released at 1:1, 1:2, and 1:3 ratios and they were named CoMo_1-S₂/C-1, CoMo_1-S₂/C-2, and CoMo_1-S₂/C-3, respectively. Overall, these materials represent a significant improvement and show promise as high-performance SC electrode materials due to their enhanced capacitance and stability. At a current density of 0.5 A g^-1, CoMo_1-S₂/C-2 has the optimal specific capacitance of 184 F g^-1. CoMo_1-S₂/C-2 as an SC electrode exhibited better reversible capacity and cycling stability than MoS₂/C, which is an improvement over MoS₂/C regarding reversible capacity and cycling stability.