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

Abstract

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 2 O 3 /polypyrrole (PPy) nanoarrays (T‐Fe 2 O 3 /PPy NAs). The 3D, and interconnected T‐Fe 2 O 3 /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 2 O 3 /PPy NAs exhibits a high areal capacitance of 382.4 mF cm −2 at a current density of 0.5 mA cm −2 and excellent reversibility. The solid‐state asymmetric supercapacitor consisting of T‐Fe 2 O 3 /PPy NAs and MnO 2 electrodes achieves a high energy density of 0.22 mWh cm −3 at a power density of 165.6 mW cm −3 .