Synthesis of Highly Conductive PPy/Graphene/MnO₂ Composite Using Ultrasonic Irradiation

Abstract

Highly conductive polypyrrole/graphene/manganese dioxide (PPy/graphene/MnO 2 ) composites are fabricated via ultrasonic irradiation using p-toluenesulfonic acid as a dopant. The microstructures of PPy/graphene/MnO 2 are evidenced by the SEM and TEM examinations. The effects of the graphene and MnO 2 loading on the electrical conductivity are investigated. The maximum conductivity of PPy/graphene/MnO 2 composites about 17.15 S/cm found with 3 wt.%graphene and 48.7 wt.% MnO 2 at room temperature. Such uniform structure together with the observed high conductivities afforded high specific capacitance. A specific capacitance of as high as 258 F/g at a current density of 1 A/g was achieved over the PPy/graphene/MnO 2 composite.

Amelioration of ionic conductivity (303 K) with the supplement of MnO2 filler in the chitosan biopolymer electrolyte for magnesium batteries

“…Magnesium nitrate hexahydrate (MgNO 3 .6H 2 O) has been selected as the magnesium salt of choice for ionic conduction (Mg 2+ ) and MnO 2 as the inert ller for enhancing the conductivity properties for the preparation of chitosan biopolymer electrolytes in this work. MnO 2 one of the widely used metal oxides with very good physical and chemical properties has been used in variety of applications such as biosensors, biocatalysts and as electrodes in energy storage devices [21,22]. Yuhan Li et al studied the enhanced Li + ion transport (1.5 times higher) along with reinforced mechanical strength (2.3 times better tensile strength) upon the addition of ller MnO 2 nanosheet than the pure PEO lithium salt complexes [23].…”

An environmentally friendly nanocomposite polypyrrole@silver/reduced graphene oxide with high catalytic activity for bacteria and antibiotics

“…The antibacterial principium of polypyrrole is probably ascribed to seepage of cytoplasm since the mutual effect of bacteria cell membrane and the positive electrical charges in PPy chains. In addition, polypyrrole (PPy) is an organic semiconductor with a narrow band gap, strong electron transport capability and redox properties [30][31][32][33]. Therefore, PPy is widely used in the eld of photocatalysis.…”

Revealing the Structural Aspect of Ultrastable Self-Supportive Bifunctional Electrocatalyst for Solar-Driven Water Splitting

“…Another example for electrochemical full water splitting using solar energy was represented by Ali Han et al where they have shown a Janus-like Cu 3 P@NF electrode, and the catalytic current density of 10 mA/cm 2 was achieved at 1.7 V when potential was supplied using a solar cell . Overall, water splitting is a thermodynamically arduous reaction and demands enormously efficient and active electrode materials that considerably accelerate the sluggish kinetics of the two half-reactions ocurring simultaneously at both cathode (HER) and anode (OER). − Electrocatalysts, the heart of an electrochemical water-splitting system, is preferred to be bifunctional in nature and has attracted immense amounts of research interest since a decade. There are two critical points that should be considered for the development of a water-splitting catalyst with respect to commercialization and industrial applications.…”