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

Abstract

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 (M x Mo 1−x S 2 /C, M = Fe, Co, and Ni) by a template method. The original monolayer mesoporous structure of MoS 2 /C was maintained, and accumulation and agglomeration of MoS 2 /C were avoided. Based on our investigations, the best performance was that of Co x Mo 1−x S 2 /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 Co x Mo 1−x S 2 /C-1, Co x Mo 1−x S 2 /C-2, and Co x Mo 1−x S 2 /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 , Co x Mo 1−x S 2 /C-2 has the optimal specific capacitance of 184 F g −1 . Co x Mo 1−x S 2 /C-2 as an SC electrode exhibited better reversible capacity and cycling stability than MoS 2 /C, which is an improvement over MoS 2 /C regarding reversible capacity and cycling stability.

Successful In Situ Growth of Conductive MOFs on 2D Cobalt-Based Compounds and Their Electrochemical Performance

“…Metal–organic frameworks (MOFs) are crystalline porous materials formed by the assembly of metal centers and organic ligands. , Based on their large specific surface area, high porosity, rich topology, and tunable framework structure, they have become hot candidates for energy storage, − gas absorption/separation, − catalysis, , and sensing − in recent years. However, the poor electrical conductivity (σ < 10 –10 S cm –1 ) of most MOFs limits their in-depth exploration in electrochemical fields .…”

Nitrogen Calcination of MOF-74 Composite-Derived Materials for Enhanced Supercapacitor Performance

“…As an emerging material with a unique two-dimensional structure and excellent conductivity, graphene-like materials are widely regarded as candidates for next-generation high-capacity electrode materials . For example, metal–sulfur compound nanosheets have a large specific surface area and ionic intercalation space, as well as reversible redox reactions and thus have been used as a combination of bilayer capacitors and pseudocapacitors. , …”

Robust MOF-on-MOF heterostructures as efficient cathode candidates for next-generation supercapacitors

“…), nanomaterials 37 (carbon dots, 38 transition metal oxide, 39,40 etc. ), (Fe, Co, Ni) molybdenumdisulfide, 41 and nano MOFs, 42 have been explored for supercapacitor application so far. However, MOFs are one of the most exciting materials due to several advantages, including tunable pore size, high surface area, and tunable structural properties, which make them ideal for application in SCs.…”