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

Abstract

The tetragonal layered transition metal copper−molybdenum sulfide Cu 2 MoS 4 (CMS) possesses a high theoretical electrochemical potential because of its abundant redox properties and large layered surface area, which is favorable for ion adsorption/desorption and transport. Cu 2 MoS 4 contains P and I phases, exhibiting different crystal structures, ion transport characteristics, and electrochemical properties accordingly. In this work, for the first time, Cu 2 MoS 4 electrode materials with dual-phase compositions are designed and prepared for supercapacitor application, providing a synergistic effect with high electron transport efficiency and structural stability. Upon an in-depth optimization process, the optimal CMS-4 sample having P and I phases coexisting yields the optimal electrochemical behavior. The CMS-4@carbon cloth (CC) electrode provides a specific capacity of 33.9 mAh g −1 at 1 A g −1 , which is 12.6 and 4.0 times higher than the pure P and I phases, respectively. The assembled MnO 2 @CC//CMS-4@CC supercapacitor exhibits a high energy density of 16.8 Wh kg −1 at 800 W kg −1 power density. The results demonstrate that two-phase coexistence of Cu 2 MoS 4 significantly enhances the electrochemical activities owing to the synergistic effects of P and I phases and provides a promising material for supercapacitor negative electrodes.

Two biomass material-derived self-doped (N/O) porous carbons from waste coriander and lilac with high specific surface areas and high capacitance for supercapacitors

“…8f shows that when the power density is 500 W kg −1 , the energy density of CPC-600 SSC is as high as 30.42 W h kg −1 , while the energy density of LPC-600 SSC is 40.97 W h kg −1 , which is much higher than most reported literature. 54,59–64 In 1 M Na 2 SO 4 , low concentrations of H + and OH − can obtain a wide operating voltage, resulting in high voltage dihydrogen precipitation. 24,65 As shown in Fig.…”

Enhanced supercapacitor performance of porous carbon through tuning maceral composition proportion of coal

“…The excessive use of fossil fuels caused by industrialization has led to global climate change and energy crises, driving the research and development of clean energy and placing higher demands on energy storage technology. 1–3 Supercapacitors (SCs) are high-power energy storage devices based on the fast accumulation/release of charges and have some advantages, such as fast discharge rate, high cycling stability, long service life, and wide operating temperature range. 4,5 SCs could supplement lithium-ion batteries (LIBs) and improve the performance of energy systems, e.g.…”

Highly Active N, S Codoped Porous Carbon Derived from Lignin-Rich Pulping Waste Liquor for Supercapacitors and Oxygen Reduction Reaction

“…At present, some progress has been made in the use of bimetallic carbides, metal borides, metal oxides, and tetragonal layered transition metals as electrode materials for supercapacitors. However, porous carbon materials doped with heteroatoms (e.g., N, P, and B − ) could function as effective electrode materials and ORR electrocatalysts for supercapacitors and Zn–air batteries, due to their distinct electronic characteristics arising from heteroatom-induced charge transfer and delocalization .…”