Fabrication of Ternary Hierarchical Nanosheets RGO/PANI/Fe₂O₃ as Electrode Material with High Capacitance Performance

Abstract

The sandwich structure hierarchical nanosheets are synthesized by an easy and reproducible way. RGO/PANI hybrid nanosheets were firstly synthesized by the polymerization of polyaniline (PANI) on reduced graphene oxide (RGO). Secondly, ternary hierarchical nanosheets of RGO/PANI/Fe 2 O 3 were fabricated by in situ growth of Fe 2 O 3 nanoparticles on RGO/PANI nanosheets with mixing K 2 FeO 4 solution and RGO/PANI under room temperature. The electrochemical study displays that RGO/PANI/Fe 2 O 3 is a typical pseudo-capacitance electrode material. RGO/PANI/Fe 2 O 3 hierarchical nanosheets have the largest specific capacitance of 605.2 F g −1 at 0.5 A g −1 . Compared with pure RGO and PANI, binary nanosheets of RGO/PANI and RGO/Fe 2 O 3 , after 5000 cycles, ternary hierarchical nanosheets still retain 93.2% initial capacitance at 0.5 A g −1 and show good stability. The good capacitance performance can be ascribed to unique sandwich-like hierarchical structure. RGO plays as scaffold to support PANI and improves the conductivity of composites. PANI can enhance the specific capacitance of hybrid nanosheets and anchor Fe 2 O 3 nanoparticles. With the protection of Fe 2 O 3 film, the swelling and shrinking of PANI can be restrained. Therefore, the RGO/PANI/Fe 2 O 3 nanosheets with sandwich structure are ideal electrode material, which have potential application prospect in supercapacitor.

Optimization of the ratio of aniline, ammonium persulfate, para ‐toluenesulfonic acid for the synthesis of conducting polyaniline and its use in energy storage devices

“…It is evident from the FESEM images that PA23 has a more uniform morphology than other samples, this could be the reason behind its excellent electrochemical behavior. In all the systems we can observe three redox peaks for PANI at approximately 0.27 V/0.19 V, 0.58 V/0.48 V, and 0.74 V/0.61 V 16 . The oxidation peak at 0.27 V is due to the conversion of leucoemeraldine salt to ES.…”

“…R S is the combined resistances coming from the electrolyte, current collector, and substrate. C DL and R CT are in parallel combination, where C DL is the EDLC and R CT is the charge transfer resistance 16,25 . All the systems are deviating from the ideal capacitor behavior as the plots in the lower frequency regions are not parallel to the Z ‐imaginary axis.…”

“…C DL and R CT are in parallel combination, where C DL is the EDLC and R CT is the charge transfer resistance. 16,25 All the systems are deviating from the ideal capacitor behavior as the plots in the lower frequency regions are not parallel to the Z-imaginary axis. So, a CPE, Q has been introduced in the EC.…”

Pt/Ni Catalyst Supported by Composite of Graphene and Polyaniline Microtubes Boosting Methanol Electrochemical Oxidation

“…21,68,69 The synergistic coupling between graphene and polyaniline improves the charge transport performance and the stability of the substrate. 70,71 By the ratio of PANI and GO at 10:1, when the immersion time of PANI and GO was optimized at 1.5 h, in Fig. S2b, the minimum charge transfer resistance could be reached.…”

Performance of Electrochemically Synthesized Nickel-Zinc and Nickel-Iron (Ni–Zn//Ni–Fe) Nanowires as Battery Type Supercapacitor

“…), facilitating high specific capacitance, 14,15 (2) most of the transition metal based materials serve as cathodes whereas Fe based materials exhibits wide as well as stable negative potential window, making them competent as negative (anode) electrodes for asymmetric supercapacitors, [16][17][18] (3) iron based materials are more ecologically safer than other transition metal based electrodes, [19][20][21] (4) abundance as in the Earth's crust, iron is the richest transition metal so it is not costly and hence fit for commercial utilization. 22,23 In recent times, researchers are trying hard to discover various Fe based electrode materials [24][25][26] but these materials show poor electrical conductivity which ultimately hinders the performance of electrode. Combination of Fe based electrodes with some highly conductive materials such as Ni effectively enhances its conductivity as well as electrochemical performance.…”