Constructing Hierarchical Tectorum‐like α‐Fe₂O₃/PPy Nanoarrays on Carbon Cloth for Solid‐State Asymmetric Supercapacitors

Abstract

The design of complex heterostructured electrode materials that deliver superior electrochemical performances to their individual counterparts has stimulated intensive research on configuring supercapacitors with high energy and power densities. Herein we fabricate hierarchical tectorum-like α-Fe O /polypyrrole (PPy) nanoarrays (T-Fe O /PPy NAs). The 3D, and interconnected T-Fe O /PPy NAs are successfully grown on conductive carbon cloth through an easy self-sacrificing template and in situ vapor-phase polymerization route under mild conditions. The electrode made of the T-Fe O /PPy NAs exhibits a high areal capacitance of 382.4 mF cm at a current density of 0.5 mA cm and excellent reversibility. The solid-state asymmetric supercapacitor consisting of T-Fe O /PPy NAs and MnO electrodes achieves a high energy density of 0.22 mWh cm at a power density of 165.6 mW cm .

Monolithic Integration of All‐in‐One Supercapacitor for 3D Electronics

“…Figure S9 (Supporting Information) shows the SEM images of the samples with different duration times. [34,35] The electrochemical performance of the carbon-based anode is also investigated. Figure 2b Supporting Information) displays a morphology of nanosheets, increasing the SSA and electrochemical active sites of the electrode.…”

Electric‐Field‐Assisted Enhanced Electron Transfer to Boost Supercapacitor Negative Electrode Performance for a Fabricated Fe7S8/α‐FeOOH Nano‐Heterostructure

“…29-0713), respectively, which is consistent with our previous report (Figure 3a). Furthermore, there are three small diffractions at 14.7°, 16 a) The XRD patterns and b) Raman spectra of CF, ACF, and SACF. 25-0411), respectively.…”

“…[8][9][10] Due to the redox characteristic of Fe-based materials, it is believed to have the higher theoretical capacity compared with carbon materials that presents double layer capacitance characteristics. [5,14,16,17] Core-shell structure is believed to be a good choice, where materials with good electrical conductivity are used as the core and materials with high theoretical capacity are used as the shell. [12,13] Therefore, how to improve the electrical conductivity to enhance the efficiency of electron transfer is the most important factor when designing and fabricating an Fe-based negative electrode material.…”

Flexible Asymmetric Microsupercapacitors from Freestanding Hollow Nickel Microfiber Electrodes

“…Several studies have addressed these issues by fabricating planar MSCs using porous carbon ink, [17] laboratory filter paper, [19] and electrostatic spraying of reduced graphene oxide (rGO) and carbon nanotube mixtures. [21,22] Varied porous-electrodes have been reported, comprising, for example, Au nanostructures, [23] carbon cloth, [24] aligned carbon nanotubes, [25] and nickel foam. Other strategies have focused on chemical means for creation of porous electrode exhibiting high surface areas, serving as a scaffold for deposition of the electrochemically active material.…”

“…[20] Yet, such processes are elaborate and often produce devices exhibiting low energy densities. [26] While such electrode designs provide high capacitance, they usually exhibit considerable thickness, [23][24][25][26] making them less suitable for integration in microelectronics. [21,22] Varied porous-electrodes have been reported, comprising, for example, Au nanostructures, [23] carbon cloth, [24] aligned carbon nanotubes, [25] and nickel foam.…”