Flexible Self-Supporting 3D Electrode Based on 3D Graphene-PPy@Fe-MnCo₂O₄ Nanostructure Arrays toward High-Performance Wearable Supercapacitors

Abstract

The development of high-performance flexible supercapacitors is desperately desired for application in wearable electronics, but the fabrication of a flexible self-supporting 3D electrode with light weight and high energy density remains challenging. Herein, we report an approach to fabricate the flexible self-supporting and lightweight 3D G-PPy@Fe-MnCo2O4 hierarchical electrode for flexible solid-state supercapacitors (FSSCs), which utilizes the active material 3D G-PPy as a substrate to vertically grow Fe-MnCo2O4 nanowire (NW) arrays. Importantly, the experimental results and DFT simulations indicate that Fe-MnCo2O4 NWs obtain metallic characteristics by doping Fe into a MnCo2O4 lattice, which induces the free propagation of electrons in the electrode. Thus, MnCo2O4 utilization efficiency and cycle performance are both greatly enhanced. The electrode has a high areal specific capacitance of 5136 mF cm–2 (422.4 F g–1) at 2 mA cm–2 with long-term cycle stability. The capacitance retention is about 94.7% after 7000 cycles. It presents a viable design route toward advanced wearable energy storage devices.

A low temperature and high-power density lignin flow fuel cell via an efficient CoMn-LDH electrocatalyst with superhydrophilic intercalation

“…2a), demonstrating that CoMn-LDH is transformed into MnCo 2 O 4 after calcination. 27 In the FT-IR spectra of CoMn-LDH, the peaks at 3505 and 1463 cm −1 can be assigned to OH − and CO 3 2− . 28 When CoMn-LDH was calcined, the peaks of OH − and CO 3 2 disappeared, and the peaks of metal-oxygen at 658 cm −1 and 558 cm −1 appeared.…”

Polypyrrole and activated carbon enriched MnCo2O4 ternary composite as efficient electrode material for hybrid supercapacitors

“…11(i) is the Ragone plot for ASC, comparing the present results with literature. 39,41,68,[78][79][80][81][82][83][84][85][86][87][88][89] The real-time practical applicability of the ASC device has also been tested. Fig.…”

“…Table S3 in ESI † provides the supercapacitive performance of some recently reported PPY-based composites of BTMOs and their comparison with present work. 39,41,68,[78][79][80][81][82][83][84][85][86][87][88][89] The comparison shows that the syn- thesized composited exhibited remarkable electrochemical performance making it a promising electrode material for energy storage applications.…”

“…37,38 Incorporating PPY in MnCo 2 O 4 can significantly boost the performance by maximizing ion diffusion and electron transfer. 39–41 Furthermore, new kinds of supercapacitors with high energy density are also gaining wide research attention. The asymmetric supercapacitors (ASCs), with a particular benefit of a wide voltage window, can considerably enrich the energy density for numerous applications.…”