Co/N Co-Doped MoS₂ with High Pseudocapacitive Performance for Solid-State Flexible Supercapacitors

Abstract

Herein, we demonstrate the enhanced pseudocapacitive performance of a MoS 2 -based flexible supercapacitor by the co-doping strategy of cations and anions. The MoS 2 nanosheet arrays on carbon cloth are directly doped with N and Co atoms through a simple hydrothermal process. The obtained cation and anion co-modified MoS 2 (N-Co-MoS 2 ) shows improved electron transport efficiency and enhanced active sites for MoS 2 . According to the first-principles calculations, N-Co-MoS 2 has a unique band structure and high electrical conductivity. As expected, N-Co-MoS 2 shows higher capacitive performance with 5072.5 mF cm −2 and a better cycle life (retaining 100% capacitance after 10,000 cycles) than pure MoS 2 . Furthermore, a solid-state flexible N-Co-MoS 2 supercapacitor device is fabricated to demonstrate excellent mechanical stability with a specific capacitance of 3236 mF cm −2 and a stable cycle capacitance of 75.56% after 5000 cycles. In our work, we have provided a reference for preparing MoS 2 -based materials with good supercapacitive performance.

Dual-Phase Coexistence Design and Advanced Electrochemical Performance of Cu2MoS4 Electrode Materials for Supercapacitor Application

“…Researchers have been focusing on transition metal (manganese, nickel, cobalt, copper, molybdenum, and iron)-based compounds and conducting polymers (polypyrrole, polythiophene, polyaniline) as pseudocapacitor electrode materials recently. , Among those, transition metal sulfides (TMCs) are receiving more and more attention because of their better conductivity, lower electronegativity, and higher electrochemical activity. , In addition, research on supercapacitor negative electrode materials is not as sufficient as that on positive electrode ones. Besides the main commercial carbon materials, some negative materials such as iron oxide/hydroxide (Fe 2 O 3 /Fe­(OH) 3 ), , bismuth oxide/sulfide (Bi 2 O 3 /Bi 2 S 3 ), , titanium oxide/nitride (TiO 2 )/(TiN), , and molybdenum oxide/sulfide (MoO 3 /MoS 2 ) , have been developed recently. However, it is still urgent to explore new and efficient negative electrode materials with high specific capacity to meet the increasing demand of modern electronic devices.…”

“…11,12 In addition, research on supercapacitor negative electrode materials is not as sufficient as that on positive electrode ones. Besides the main commercial carbon materials, some negative materials such as iron oxide/hydroxide (Fe 2 O 3 /Fe(OH) 3 ), 13,14 bismuth oxide/sulfide (Bi 2 O 3 /Bi 2 S 3 ), 15,16 titanium oxide/nitride (TiO 2 )/(TiN), 17,18 and molybdenum oxide/sulfide (MoO 3 / MoS 2 ) 19,20 have been developed recently. However, it is still urgent to explore new and efficient negative electrode materials with high specific capacity to meet the increasing demand of modern electronic devices.…”

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

“…GNP/MoS 2 nanosheets showed specific capacitance and excellent cycling stability. Jia et al 22 demonstrated the enhanced pseudocapacitive performance of a MoS 2 -based flexible SC by the codoping strategy of cations and anions, and the MoS 2 nanosheet arrays on carbon cloth were directly doped with N and Co atoms through a simple hydrothermal process. Hanifehpour et al 23 reported the effect of iron doping on the MoS 2 morphology, composition, and supercapacitor behavior, which were systematically investigated.…”

Self-assembled molybdenum disulfide nanoflowers regulated by lithium sulfate for high performance supercapacitors

“…1 Owing to the characteristics of high theoretical capacity and electrochemical activity, relatively large and easily expanded interlayer distance, easy preparation, and low cost, MoS 2 has been extensively investigated in the eld of supercapacitors, batteries and electrocatalysts. [2][3][4][5][6][7] However, MoS 2 usually suffers from serious stacking and agglomeration problems during the preparation process, which leads to formation of many inaccessible active sites. 8 As a pseudocapacitive electrode material of supercapacitors, the low conductivity and large volume variation during repeated charge/discharge cycles also give rise to inferior rate capability and cycling stability of MoS 2 , which restrains its practical application in energy storage.…”