Designing an advanced electrode of mixed carbon materials layered on polypyrrole/reduced graphene oxide for high specific energy supercapacitor

Abstract

A free-standing and flexible film is fabricated by layering multiwalled carbon nanotube/reduced graphene oxide/nanocrystalline cellulose composite on polypyrrole/reduced graphene oxide composite layer. The bilayer composite film is prepared by in-situ polymerization through a vacuum filtration method followed by a chemical reduction in the presence of hydrazine vapor and used as an electrode material for supercapacitor. The aggregation of multiwalled carbon nanotube and graphene oxide in the composite are addressed effectively by the support of nanocrystalline cellulose that favors ions movements in the composite. The symmetrical supercapacitor device developed in this study combines the features of pseudocapacitor and electrical double layer capacitor and delivers outstanding supercapacitive properties. As manifested by the electrochemical results, the device exhibits a high specific capacitance of 882.2 F g−1, remarkable cycling stability of ∼90% over 10,000 cycles, and high specific energy of 44.6 Wh kg−1 with a high specific power of 2889.9 W kg−1, which outperformed many other reported polypyrrole-based materials for supercapacitors. This makes the bilayer a promising candidate for future high performance energy storage devices.

A simple strategy to prepare a layer-by-layer assembled composite of Ni–Co LDHs on polypyrrole/rGO for a high specific capacitance supercapacitor

“…More importantly, the obvious peak at 986 cm À1 with adjacent shoulder peak shows the deformation of the pyrrole ring, suggesting PPy is successfully introduced with rGO. 10 The Raman spectrum of pure Ni-Co LDHs shows characteristic peaks at 463 and 526 cm À1 that related to Ni-O and Co-O vibrational modes in LDHs, respectively. 23 The presence of these peaks validating the formation of LDHs.…”

“…Polypyrrole (PPy) is being the most explored conducting polymer that usually combined with carbon-based materials namely GO and rGO to improve its properties. 9,10 Among the metal oxides/hydroxides, layered double hydroxides (LDHs) particularly nickel-cobalt LDHs (Ni-Co LDHs) are an emerging electrode material for SCs due to its high theoretical specic capacitance owing from synergistic effects of its two cations. 11 Additionally, Ni-Co LDHs also have a high specic area, low cost, environment friendliness and its layered structure allow faster ion intercalation-deintercalation process.…”

“…13 There are few studies conducted on LBL assembly in order to prepare the electrode materials for SCs and interestingly those studies disclosed extraordinary electrochemical performances. 10,14,15 Therefore, herein, we reported a facile fabrication of Ni-Co LDHs via hydrothermal and for the rst time, layered it on PPy/ GO (PPy/GO|Ni-Co LDHs) by utilizing the LBL assembly concept through a simple vacuum ltration method. The PPy/ GO serves as a support for Ni-Co LDHs, where the LDHs anchored rmly on the PPy/GO layer.…”

Recent Advances in Layer-by-Layer Assembled Conducting Polymer Based Composites for Supercapacitors

“…The advantage of this straightforward technique is that it involves mild processing conditions which are mostly conducted at room temperature, non-toxic chemicals, and minimum use of chemicals [78,81,82]. The most common electrolytes used in the electrodeposition are aqueous [80,[83][84][85] and non-aqueous [86,87].…”

Polyaniline/Poly(acrylamide‐co‐sodium acrylate) Porous Conductive Hydrogels with High Stretchability by Freeze‐Thaw‐Shrink Treatment for Flexible Electrodes

“…With the development of alternatives to traditional fossil energy and the rise of wearable technology, the flexible energy storage device with high‐efficiency has become a hot topic. [ 1 ] The core components of energy storage devices, such as batteries and capacitors, are electrodes, whose electroactive substances are usually rigid materials including conductive polymers, [ 2–5 ] carbon materials, [ 6–9 ] and metal oxides. [ 10 ] Conductive polymers (such as polyaniline, polypyrrole, and polythiophene) have good electrical conductivity, excellent processability, and large capacitance, [ 3 ] and are widely used in the preparation of batteries, [ 11,12 ] supercapacitors, [ 13–16 ] and sensors.…”