Co-electrodeposition of MnO2/graphene oxide coating on carbon paper from phosphate buffer and the capacitive properties

2013 ◽  
Vol 18 (2) ◽  
pp. 553-559 ◽  
Author(s):  
Hua Zhao ◽  
Feifei Liu ◽  
Gaoyi Han ◽  
Zhaoyang Liu ◽  
Bin Liu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Phosphate Buffer ◽  
Oxide Coating ◽  
Carbon Paper ◽  
Capacitive Properties

scholarly journals Transport of Protons and Capacitive Properties of the Nylon/Porphyrin/Graphene Oxide Coating

2017 ◽  
Author(s):  
César A. García-Pérez ◽  
Carmina Menchaca-Campos ◽  
Miguel A. García-Sánchez ◽  
Ociel Rodríguez-Pérez ◽  
Jorge Uruchurtu
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Impedance ◽  
Composite Films ◽  
Oxide Coating ◽  
Film Coating ◽  
Bipolar Plates ◽  
Transfer Product ◽  
Low Frequencies ◽  
Capacitive Properties ◽  
Acid Environment

Electrochemical impedance (EI) measurements were performed to evaluate the nylon 66/-tetra-(para-aminophenyl) porphyrin (H2T(p-NH2)PP)/graphene oxide (GO) film coating on stainless steel and compared to the nylon/H2T(p-NH2)PP and nylon/GO film samples using 1M H2SO4 as electrolyte. The nylon/H2T(p-NH2)PP and nylon/GO composite films showed high electrochemical impedance in the order of 109 ohm-cm2 and a system controlled by mass transfer, product of a diffusion process at low frequencies with a resistance up to 5 orders of magnitude, indicating the diffusion of protons through the coating and a decrease in the metal dissolution. Otherwise, the nylon/H2T(p-NH2)PP/GO film compound evaluated show good ionic conductivity and electrochemical stability in the acid environment, acting porphyrin as a catalyst to the passage of protons through the film, reducing its electrochemical impedance up to 7 orders of magnitude with respect to the compounds nylon/H2T(p-NH2)PP and nylon/GO. Likewise, good capacitance values are also shown by modifying the concentrations of porphyrin and GO reinforcing materials. These properties are important for technological applications, such as anticorrosion coating for bipolar plates or membrane in a fuel cell type PEM, super-capacitors, etc.

Flexible Graphene Sensors for Explosive Trace Detection

2011 ◽  
Author(s):  
Je Kyun Lee ◽  
Steven Green ◽  
Sangyup Song ◽  
Paul Phamduy ◽  
Byungki Kim
Keyword(s):  
Graphene Oxide ◽  
Polyethylene Terephthalate ◽  
Oxide Coating ◽  
Trace Detection ◽  
Closed Container ◽  
Explosive Sensors

This paper presents an explosives sensor. The sensor consists of graphene spray coated onto a substrate with electrodes patterned on the surface. The substrates included glass and flexible polyethylene terephthalate (PET), and the leads were gold and silver respectively. Testing utilizing dinitrotoulene 2,4 (DNT) in a closed container showed the validity of using glass/gold based substrate with a graphene oxide coating as explosive sensors.

Inhibiting the shuttle effect of Li–S battery with a graphene oxide coating separator: Performance improvement and mechanism study

2017 ◽  
Vol 342 ◽  
pp. 929-938 ◽  
Author(s):  
Yong Jiang ◽  
Fang Chen ◽  
Yang Gao ◽  
Yanyan Wang ◽  
Shanshan Wang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Performance Improvement ◽  
Oxide Coating ◽  
Mechanism Study ◽  
Shuttle Effect

Ternary Composite of Molybdenum Disulfide-Graphene Oxide-Polyaniline for Supercapacitor

2021 ◽  
Author(s):  
Ke Qu ◽  
Yuqi Bai ◽  
Miao Deng
Keyword(s):  
Graphene Oxide ◽  
Molybdenum Disulfide ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Light Emitting Diode ◽  
Rate Capability ◽  
Energy Storage And Conversion ◽  
Carbon Paper ◽  
Power Sources ◽  
X Ray

Abstract The ever-increasing need for small and lightweight power sources for use in portable or wearable electronic devices has spurred the development of supercapacitors as a promising energy storage and conversion system. In this work, a simple, facile and easy-to-practice method has been developed to employ carbon paper (CP) as the support to coat molybdenum disulfide (MoS2) and graphene oxide (GO), followed by electrodeposition of polyaniline (PANI) to render CP/MoS2-GO-PANI. The preparation parameters, such as amounts of MoS2, GO and number of aniline electropolymerization cycles, have been optimized to render CP/MoS2-GO-PANI the best capacitive performance. The as-prepared optimal CP/MoS2-GO-PANI is characterized by X-ray powder diffraction, scanning electron microscopy, energy-dispersive spectroscopy, and X-ray photoelectron spectroscopy. The supercapacitive properties of CP/MoS2-GO-PANI as an electrode have been evaluated electrochemically via cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy testing. CP/MoS2-GO-PANI delivers a specific capacitance of 255.1 F/g at 1.0 A/g and exhibits excellent rate capability under larger current densities. Moreover, a symmetrical supercapacitor is assembled and three are connected in series to power a light-emitting diode for ~15 minutes, demonstrating the promising application potential of CP/MoS2-GO-PANI-based supercapacitor.

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