Integration of Ultrathin MoS₂/PANI/CNT Composite Paper in Producing All-Solid-State Flexible Supercapacitors with Exceptional Volumetric Energy Density

Abstract

Due to the expeditious expansion of wearable electronics, all-solid-state flexible supercapacitors are being contemplated as promising energy-storage devices. Through the successful preparation of large quantities of high-quality semiconducting-type thin molybdenum disulfide (MoS 2 ) sheets suspended in water, the authors have developed an environmentally friendly and simple method to fabricate ternary flexible electrodes with MoS 2 , polyaniline (PANI), and carbon nanotubes (CNTs). The resulting MoS 2 /PANI/CNT all-solid-state supercapacitor can be easily integrated in series to power commercial light-emitting diodes without an external bias voltage. In addition, such a supercapacitor exhibits remarkable energy density (0.013 Wh cm −3 ) and power density (1.000 W cm −3 ), thus making it superior to commercially available lithium thinfilm batteries (4 V/500 μA h) and 2.75 V/44 mF activated carbon electrochemical capacitors. These results demonstrate that the exfoliated MoS 2 -based composite is a promising material for the development of high-performance and low-cost energystorage devices.

Connecting PEDOT Nanotube Arrays by Polyaniline Coating toward a Flexible and High-Rate Supercapacitor

“…Considering the device thickness of 100 μm, the maximal areal energy density of the device is 0.16 mWh cm –2 with an areal power density of 1.8 mW cm –2 . Although the energy stored in the Ti@PEDOT-PANi-based capacitor is slightly lower than that of N-doped graphene/PANi (26.5 mW h cm –3 ) and N-doped holey graphene (22.4 mW h cm –3 ), it is still higher than the recent results of PANi-based devices constructed with 3D graphene/PANi (14.2 mW h cm –3 ), PANi nanorods/graphene fiber (5.7 mW h cm –3 ), PANi monolithic (1.7 mW h cm –3 ), p -phenylenediamine intercalated graphene (15.4 mW h cm –3 ), MoS 2 /PANi/CNTs (13 mW h cm –3 ), ACM/MWCNTs@PANi (2.14 mW h cm –3 ), PANi-modified CNTs and carbon fibers (29.4 and 131 μW h cm –2 ), , PANi-decorated supramolecular hydrogel (8.48 μW h cm –2 ), 3D PANi nanoweb (12.7 μW h cm –2 ), PANi/cellulose nanofibril hydrogel (106 μW h cm –2 ), and other PANi-based electrodes (Table S1 and Figure e).…”

One-Pot Hydrothermal Synthesis of Solution-Processable MoS2/PEDOT:PSS Composites for High-Performance Supercapacitors

“…The calculated areal capacitances (Figure 6a) were 360, 308, 260, 205, and 160 mF cm −2 at current densities of 0.5, 1, 2, 4, and 8 mA cm −2 , respectively. Such a high capacitance of 360 mF cm −2 (110.8 F cm −3 ) in the solid-state supercapacitor outperformed many previously reported MoS 2 -or PEDOTbased composite films including the PEDOT/PSS-rGO composite electrode (49.9 F cm −3 ), 25 RuO 2 /PEDOT:PSS ultrathin films (1.2 mF cm −2 ), 57 3D graphene hydrogel film (31 F cm −3 ), 58 PEDOT paper (35 F cm −3 ), 59 ultrathin MoS 2 / PANI/CNT composite paper (91.1 F cm −3 ), 60 MoS 2 /carbon cloth (2236.6 mF cm −2 ), 61 and MoS 2 @CNT electrodes (131 mF cm −2 ). 62 The corresponding areal energy density and power density of the MP12 film-based solid-state supercapacitors were calculated (Figure 6a).…”

How Ion Size influences Energy Storage in Cylindrical Nanoporous Supercapacitors

“…Supercapacitors (also known as ultracapacitors or electrochemical capacitors) store electrical energy in electrical double layers (EDLs) physically through charge separation from electrolytic ion sorption on charged electrode surfaces, resulting in the fact that they are endowed with a higher power density than lithium-ion batteries (LIBs) and extraordinary cyclability due to their potential applications in portable or wearable electronics, electric vehicles, smart grids, and back-up power devices. − Supercapacitors continue to be a highly active research field. However, the rather moderate energy density of supercapacitors (usually less than 10 Wh kg –1 ) greatly limits their applications.…”