Fabrication of a Three-Dimensionally Networked MoO₃/PPy/rGO Composite for a High-Performance Symmetric Supercapacitor

Abstract

A three-dimensionally interconnected molybdenum trioxide (MoO 3 )/polypyrrole (PPy)/reduced graphene oxide (rGO) composite was synthesized via an eco-friendly three-step method. The as-obtained electrode shows a high specific capacity of 412.3 F g –1 at a current density of 0.5 A g –1 and a good cycling stability (85.1% of the initial specific capacitance after 6000 cycles at 2 A g –1 is retained), and these excellent electrochemical performances can be attributed to the unique structure, remarkable electrical conductivity, and the synergetic effects between MoO 3 , PPy, and rGO. Furthermore, a symmetric supercapacitor based on a MoO 3 /PPy/rGO electrode was assembled to investigate the practical application performance of this material. The results demonstrate a high energy density of 19.8 W h kg –1 at a power density of 301 W kg –1 . These findings shine a light on the rational design of electrode materials with multicomponents for high-performance supercapacitors.

Enhanced Capacitance Performance by Coupling 2D Conductive Metal–Organic Frameworks and Conducting Polymers for Hybrid Supercapacitors

“…Moreover, PPy@NiCo-CAT exhibits electrochemical properties and PPy@NiCo-CAT compares favorably with those of other PPy-based or M-CAT composite electrodes (Table S3). For instance, the performance of PPy@NiCo-CAT is superior to those of CNF@Ni-CAT (502.95 F g –1 ), PPy/ZIF (554 F g –1 ), MoO 3 /PPy/rGO (412.3 F g –1 ), R-PPy (322.5 F g –1 ), Ni/PPy/MnO 2 (350 F g –1 ), and Ni/MnO 2 /PPy (473.8 F g –1 ) …”

“…Moreover, PPy@NiCo-CAT exhibits electrochemical properties and PPy@NiCo-CAT compares favorably with those of other PPy-based or M-CAT composite electrodes (Table S3). For instance, the performance of PPy@NiCo-CAT is superior to those of CNF@Ni-CAT (502.95 F g −1 ), 41 PPy/ ZIF (554 F g −1 ), 42 MoO 3 /PPy/rGO (412.3 F g −1 ), 43 R-PPy (322.5 F g −1 ), 44 Ni/PPy/MnO 2 (350 F g −1 ), and Ni/MnO 2 / PPy (473.8 F g −1 ). 45 To investigate in depth the reaction kinetics for the energystorage mechanism of the PPy@NiCo-CAT, the b value is obtained by current (i) and scan rate (v) in eq 1 46…”

Physicochemical Approaches for Thin Film Energy Storage Devices through PVD Techniques

“…TFSCs make their presence as one of the greatest hopeful energy storage devices attributable to their high power density, outstanding stability, light weight and are easy to handle. Nevertheless, the performance of predictable designs deteriorates extensively as a consequence of electrode and electrolyte exposure to atmosphere along with mechanical distortions for the case of flexible systems [25]. TFSCs are flexible and easily reconfigurable supercapacitors display great potential for application in portable electronics.…”

Self-Assembly Vertical Graphene-Based MoO3 Nanosheets for High Performance Supercapacitors

“…That makes it an important material for pseudo capacitance electrodes. However, the MoO 3 electrode usually presents a poor electric conductivity and its volume and crystal structure are easy to change during the processes of charge and discharge, along with the variation of valence state [27][28][29]. All the disadvantages lead to a rapid decrease of storage capacitance and apparent irreversibility for the MoO 3 electrode.…”