scholarly journals Few-Layer Graphene based Printed Flexible Asymmetric Supercapacitor

2019 ◽  
Author(s):  
Ankit Singh ◽  
Kaushik Ghosh ◽  
Sushil Kumar ◽  
Ashwini Agrawal ◽  
Manjeet Jassal ◽  
...  
Keyword(s):  
Activated Carbon ◽  
High Temperature ◽  
Screen Printing ◽  
Low Cost ◽  
Banana Peel ◽  
Asymmetric Supercapacitor ◽  
Layer Graphene ◽  
Screen Printing Technique ◽  
Printing Technique ◽  
Few Layer Graphene

We have developed a flexible planar asymmetric supercapacitor demonstrating high energy storage capability which can be utilized to power various flexible and wearable electronic devices. Locally available cheap source of biomass such as banana peel was utilized for synthesizing carbonaceous materials like few-layer graphene and activated carbon for electrode material application. Few-layer graphene was synthesized by heating banana peel at high temperature under inert atmosphere followed by crushing with mortar-pestle. Activated carbon was synthesized by heating banana peel impregnated with KOH at high temperature in absence of air. The device was fabricated by using low-cost screen printing technique to print current collectors followed by deposition of active electrode materials and sandwiching filter paper soaked in gel electrolyte in between the electrodes. The fabricated devices showed high areal capacitance of 88.31mF/cm2 at 10 mV/s scan rate. The device also showed satisfactory performance under multiple electronic cycling (100 cycles) and bending conditions. The device can be fabricated on a large scale using low-cost screen printing technique and cheaply available biomass which can be further utilized for developing emerging flexible electronics.

scholarly journals Flexible Fibre Supercapacitor using Synthesized Biomass based Activated Carbon and Few Layer Graphene for Wearable Electronic Devices

2019 ◽  
Author(s):  
Ankit Singh ◽  
Kaushik Ghosh ◽  
Sushil Kumar ◽  
Ashwini Agrawal ◽  
Manjeet Jassal ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Large Scale ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Dip Coating ◽  
Banana Peel ◽  
Electronic Textiles ◽  
Layer Graphene ◽  
Wearable Electronic ◽  
Few Layer Graphene

We have fabricated a flexible fibre supercapacitor having twisted architecture incorporating synthesized carbonaceous electrode materials from widely available inexpensive biomass (banana peel) for energy storage which can be utilized for powering emerging wearable electronic textiles and devices. Activated carbon and few layer graphene were synthesized by carbonizing KOH impregnated and ethanol/acetone washed banana peels respectively at high temperature under inert atmosphere. The synthesized carbonaceous electrode materials along with TiO2 nanopowder were deposited on conductive carbon fibre followed by dip coating with gel electrolyte and twisting to develop the supercapacitor. The fabricated fibre supercapacitor demonstrated high specific capacitance of 15.45 F/g and volumetric capacitance of 1.77 F/cm3 at 10mV/s scan rate. The developed supercapacitor retained ~92% of capacitance upon bending. The fibre supercapacitor can be fabricated on large scale using simple methods and inexpensive biomass for powering wearable electronic applications.

scholarly journals Screen Printed La2/3Sr1/3MnO3 Thick Films on Alumina Substrates

1998 ◽  
Vol 13 (9) ◽  
pp. 2623-2631 ◽  
Author(s):  
L. Durand ◽  
Ll. Balcells ◽  
A. Calleja ◽  
J. Fontcuberta ◽  
X. Obradors
Keyword(s):  
High Temperature ◽  
Mechanical Stress ◽  
Screen Printing ◽  
Thick Films ◽  
High Resistivity ◽  
Low Field ◽  
Screen Printing Technique ◽  
Printing Technique ◽  
Screen Printed

We report here on the preparation of La2/3Sr1/3MnO3 magnetoresistive thick films on polycrystalline Al2O3 substates by using the screen printing technique. It is shown that films can be obtained using high temperature sintering. While there is a reacted layer, this improves adhesion and is not too troublesome if the films are made thick enough. It is shown that PbO–B2O3 –SiO2 glass additives allow sintering at lower temperatures and can be used to improve the mechanical stress of the films. However, it is found that glass concentrations large enough to significantly improve the film adherence result in a weak low field magnetoresistance probably because grains are coated with high resistivity material. Strategies to overcome these difficulties are discussed.

Screen-printed graphene-based electrochemical sensors for a microfluidic device

2017 ◽  
Vol 9 (24) ◽  
pp. 3689-3695 ◽  
Author(s):  
C. Karuwan ◽  
A. Wisitsoraat ◽  
P. Chaisuwan ◽  
D. Nacapricha ◽  
A. Tuantranont
Keyword(s):  
Microfluidic Device ◽  
Screen Printing ◽  
Electrochemical Sensors ◽  
Amperometric Detection ◽  
New Method ◽  
Screen Printing Technique ◽  
Printing Technique ◽  
Electrochemical Electrodes ◽  
Screen Printed

This work presents a new method for mass fabrication of a new microfluidic device with integrated graphene-based electrochemical electrodes by the screen printing technique for in-channel amperometric detection.

scholarly journals Efficient Removal of Methyl Orange and Rhodamine-B Dyes with Low Cost Banana Peel Activated Carbon

2020 ◽  
Vol 32 (5) ◽  
pp. 1121-1127
Author(s):  
Mahesh Kumar Gupta ◽  
P.K. Tandon ◽  
Neelam Shukla ◽  
Harendra Singh ◽  
Shalini Srivastava
Keyword(s):  
Activated Carbon ◽  
Methyl Orange ◽  
Rhodamine B ◽  
Low Cost ◽  
Banana Peel ◽  
Duration Of Treatment ◽  
Wide Range ◽  
Before And After ◽  
Efficient Adsorbent ◽  
Solution Changes

Acid activated carbon obtained from cheap, non-toxic and locally available banana peel was used as a low cost and efficient adsorbent for the removal of dyes methyl orange and rhodamine-B from the aqueous solution. Changes in the resulting material before and after activation and after treatment were studied by different techniques, such as SEM-EDX, XRD, FTIR measurements. Effects of duration of treatment, amount of banana peel activated carbon, pH, and initial methyl orange and rhodamine-B concentration, on the removal of dye were studied to get optimum conditions for maximum dye removal. Removal efficiency of the activated ash remains almost constant in a wide range of pH from 2.5 to 5.6. In 75 min at room temperature removal of 98.5 % methyl orange (anionic) and 99.0 % rhodamine-B (cationic) dyes with 0.1 g and 0.125 g, respectively was obtained from the contaminated water having 10 ppm dye concentration.

scholarly journals Textiles Printing Using Microencapsulated Pigments in Biodegradable Thickeners

2018 ◽  
Vol 15 (1) ◽  
pp. 6122-6129 ◽  
Author(s):  
Meram S. Abdelrahman ◽  
Sahar Nassar ◽  
Hamada Mashaly ◽  
Safia Mahmoud ◽  
Dalia Maamoun
Keyword(s):  
Screen Printing ◽  
Average Particle Size ◽  
Morphological Structure ◽  
Core Material ◽  
Average Particle ◽  
X Ray ◽  
Screen Printing Technique ◽  
Printing Technique ◽  
Encapsulation Process ◽  
Dispersing Agents

Micro-encapsulated pigments were formulated into biodegradable printing pastes and their properties were analyzed. The pigment was used as the core material and polylactic-based biodegradable thickener was used as the wall-former. Cotton/polyester blend fabric was printed with micro-encapsulated pigment using screen-printing technique without dispersing agents, penetrating agents, leveling agents or other auxiliaries. Micro-encapsulated pigment has been characterized in terms of average particle size and size distribution, morphological structure and elemental composition using scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). The variations in viscosity and paste stability were observed upon storing over 7 days at ambient temperature. For permanence, the micro-encapsulation process afforded better colorfastness properties against light, washing, rubbing, and perspiration.

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