Multi‐functional structural supercapacitor based on manganese oxide‐hydroxide nanowires modified carbon fiber fabric electrodes

Abstract

Carbon fiber is an ideal candidate for preparing electrode of structural supercapacitors, while its low specific surface area is a vital factor which restricts energy storage performance. In this study, MnOOH nanowires (MnOOH‐NWs) are in‐situ deposited onto the woven carbon fiber fabric (WCF) surface through an effective one‐step hydrothermal treatment to prepare MnOOH‐NWs modified WCF (MnOOH‐NWs@WCF) structural supercapacitor with appreciable electrochemical performance. The areal capacitance of MnOOH‐NWs@WCF structural supercapacitor reaches 77.1 mF/cm2, which is two orders of magnitude higher than that made from neat WCF electrode. The increase in areal capacitance is primarily due to the presence of conductive networks and abundant ion storage sites constructed by the MnOOH‐NWs. Meanwhile, flexural strength and modulus of the MnOOH‐NWs@WCF structural supercapacitor are 30.3 MPa and 1.8 GPa, respectively. Interestingly, the resultant structural supercapacitor also enables electromagnetic interference (EMI) shielding based on the conductive networks constructed by the WCF and MnOOH‐NWs, and the maximum EMI‐shielding effectiveness (EMI‐SE) is 59.1 dB. Consequently, a highly integrated multi‐functional structural supercapacitor is developed, which cannot only be applied as energy storage module and load bearing component but can also be adopted to protect electronic devices from the electromagnetic pollution.

Advanced Carbons Nanofibers‐Based Electrodes for Flexible Energy Storage Devices

“…The 1D structure with a large aspect ratio can significantly promote the diffusion of ions and electrons, divided into nanotubes, [ 266 ] nanowires, [ 267 ] nanoribbons [ 268 ] and nanoneedles. [ 269 ] Liu et al.…”

Recent advances in structural design of conductive polymer composites for electromagnetic interference shielding

“…Plenty of conductive fillers should often be necessary to receive sufficient conductivities and EMI SEs. Furthermore, the introduction of a large number of conductive fillers could easily lead to problems such as filler agglomeration, decreased mechanical performance, and increased costs 138–140 …”

“…Furthermore, the introduction of a large number of conductive fillers could easily lead to problems such as filler agglomeration, decreased mechanical performance, and increased costs. [138][139][140] The inorganic carbon-based nanofillers with superior conductivities and high aspect ratios could construct well-organized interconnected networks in polymer matrix, resulting in outstanding shielding properties of CPCs. [141][142][143][144] For instance, Bansala et al 145 noted that when the thermally exfoliated GNSs were uniformly distributed in thermoplastic polyurethane (TPU), the intensity of incident EMWs was decreased by $99.9% with the nanofiller content of 5.5 vol% in the frequency of Ku band.…”

Compressible zinc‐ion hybrid supercapacitor and piezoresistive sensor based on reduced graphene oxide/polypyrrole modified melamine sponge

“…[9] Carbon materials have good electrical conductivity, which is conducive to improving the charge-discharge cycling stability and rate performance. The specific capacity can be further enhanced when they are integrated with other active materials (conducting polymers, [10,11] metal oxides, [12,13] metal hydroxides, [14] etc.). However, the compressive performance of the carbon-based electrodes is relatively poor because the structure of carbonbased skeletons is easy to be destroyed by high stress/ strain.…”