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 Cyclic production of biocompatible few-layer graphene ink with in-line shear-mixing for inkjet-printed electrodes and Li-ion energy storage

2022 ◽  
Vol 6 (1) ◽  
Author(s):  
Tian Carey ◽  
Abdelnour Alhourani ◽  
Ruiyuan Tian ◽  
Shayan Seyedin ◽  
Adrees Arbab ◽  
...  
Keyword(s):  
Large Scale ◽  
Umbilical Vein ◽  
Low Cost ◽  
Lithium Ion ◽  
Electronic Textiles ◽  
Lithium Storage ◽  
Colon Cells ◽  
Layer Graphene ◽  
Shear Mixing ◽  
Few Layer Graphene

AbstractThe scalable production of two-dimensional (2D) materials is needed to accelerate their adoption to industry. In this work, we present a low-cost in-line and enclosed process of exfoliation based on high-shear mixing to create aqueous dispersions of few-layer graphene, on a large scale with a Yw ~ 100% yield by weight and throughput of ϕ ~ 8.3 g h−1. The in-line process minimises basal plane defects compared to traditional beaker-based shear mixing which we attribute to a reduced Reynolds number, Re ~ 105. We demonstrate highly conductive graphene material with conductivities as high as σ ∼ 1.5 × 104 S m−1 leading to sheet-resistances as low as Rs ∼ 2.6 Ω □−1 (t ∼ 25 μm). The process is ideal for formulating non-toxic, biocompatible and highly concentrated (c ∼ 100 mg ml−1) inks. We utilise the graphene inks for inkjet printable conductive interconnects and lithium-ion battery anode composites that demonstrate a low-rate lithium storage capability of 370 mAh g−1, close to the theoretical capacity of graphite. Finally, we demonstrate the biocompatibility of the graphene inks with human colon cells and human umbilical vein endothelial cells at high c ∼ 1 mg ml−1 facilitating a route for the use of the graphene inks in applications that require biocompatibility at high c such as electronic textiles.

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 A Thin Layer of Activated Carbon Deposited on Polyurethane Cube Leads to New Conductive Bioanode for (Plant) Microbial Fuel Cell

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 574
Author(s):  
Emilius Sudirjo ◽  
Paola Y. Constantino Diaz ◽  
Matteo Cociancich ◽  
Rens Lisman ◽  
Christian Snik ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Activated Carbon ◽  
Field Test ◽  
Microbial Fuel Cells ◽  
Large Scale ◽  
Electrode Materials ◽  
Low Cost ◽  
Three Dimensional ◽  
Polyurethane Foams ◽  
Electrochemically Active

Large-scale implementation of (plant) microbial fuel cells is greatly limited by high electrode costs. In this work, the potential of exploiting electrochemically active self-assembled biofilms in fabricating three-dimensional bioelectrodes for (plant) microbial fuel cells with minimum use of electrode materials was studied. Three-dimensional robust bioanodes were successfully developed with inexpensive polyurethane foams (PU) and activated carbon (AC). The PU/AC electrode bases were fabricated via a water-based sorption of AC particles on the surface of the PU cubes. The electrical current was enhanced by growth of bacteria on the PU/AC bioanode while sole current collectors produced minor current. Growth and electrochemical activity of the biofilm were shown with SEM imaging and DNA sequencing of the microbial community. The electric conductivity of the PU/AC electrode enhanced over time during bioanode development. The maximum current and power density of an acetate fed MFC reached 3 mA·m−2 projected surface area of anode compartment and 22 mW·m−3 anode compartment. The field test of the Plant-MFC reached a maximum performance of 0.9 mW·m−2 plant growth area (PGA) at a current density of 5.6 mA·m−2 PGA. A paddy field test showed that the PU/AC electrode was suitable as an anode material in combination with a graphite felt cathode. Finally, this study offers insights on the role of electrochemically active biofilms as natural enhancers of the conductivity of electrodes and as transformers of inert low-cost electrode materials into living electron acceptors.

Sulphur-doped banana peel-derived activated carbon as electrode materials for supercapacitors

2019 ◽  
Vol 15 (1/2) ◽  
pp. 181 ◽  
Author(s):  
Hui Chen ◽  
Zhuangzhi Zhao ◽  
Peirong Qi ◽  
Gang Wang ◽  
Lei Shi ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Electrode Materials ◽  
Banana Peel

Preparation of lignite-based activated carbon with high specific capacitance for electrochemical capacitors

2015 ◽  
Vol 08 (04) ◽  
pp. 1550031 ◽  
Author(s):  
Baolin Xing ◽  
Jianliang Cao ◽  
Yan Wang ◽  
Guiyun Yi ◽  
Chuanxiang Zhang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Electron Microscope ◽  
Specific Capacitance ◽  
Current Density ◽  
Electrode Materials ◽  
High Current Density ◽  
Electrochemical Capacitors ◽  
High Specific Capacitance ◽  
High Current ◽  
Charge Discharge

A lignite-based activated carbon (LAC) for electrochemical capacitors (ECs) was prepared from high moisture lignite by KOH activation, and the as-prepared sample was characterized by the N 2-sorption, scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS) techniques. The electrochemical performances of ECs with activated carbon as electrodes in 3 M KOH aqueous solution were evaluated by constant current charge-discharge and cyclic voltammetry. The LAC exhibits a well-developed surface area of 2581 m2/g, a relative wide pore size distribution of 0.5–10 nm. The ECs with LAC as electrode materials presents a high specific capacitance of 392 F/g at a low current density of 50 mA/g, and still remains 315 F/g even at a high current density of 5 A/g. The residual specific capacitance is as high as 92.9% after 2000 cycles. Compared with the commercial activated carbon (Maxsorb: Commercial product, Kansai, Japan), the LAC based electrode materials shows superior capacitive performance in terms of specific capacitance and charge–discharge performance at the high current density.

Strand-spacing dependency on the tensile response of tri-component elastic-conductive composite yarns

2018 ◽  
Vol 89 (7) ◽  
pp. 1237-1245 ◽  
Author(s):  
Yong Wang ◽  
Weidong Yu ◽  
Fumei Wang
Keyword(s):  
Large Scale ◽  
Scale Production ◽  
Electronic Textiles ◽  
Conductive Composite ◽  
Large Scale Production ◽  
Significant Difference ◽  
Fabrication Procedure ◽  
Tensile Data ◽  
Strand Spacing ◽  
Wearable Electronic

This study focuses on the effect of strand spacing on the tensile behavior of tri-component elastic-conductive composite yarns (t-ECCYs). The fabrication procedure of t-ECCYs was previously reported using a modified ring frame. The tensile data were analyzed with SPSS using one-way analysis of variance followed by post hoc Fisher’s least significant difference test (α = 0.05). The results demonstrate that with elevated strand spacing up to 14.0 mm, the breaking tenacity and extension at break of yarns increase, beyond which they reduce, and mean results were considered significantly different. Furthermore, a two-parameter Weibull distribution and box-whisker plot can be appropriately used to quantify the variability of tensile strength. It is evident that strand spacing plays a crucial role in influencing the structure and hence the final behavior of yarns. The shape of twisting triangle was obviously asymmetric, primarily due to modulus differences of its sub-strands in the resulting yarns. In particular, a bottom-and-right displacement of convergence points was observed with the increasing strand spacing. Finally, the electrical conductivity of t-ECCYs in various stretching states was characterized. With the superior conductivity under different stretching, t-ECCYs have tremendous prospects for wearable electronic applications. More importantly, desirable characteristics that are possibly possessed by the yarns are industrial weavability and knittability, which will pave a convenient but highly effective way for the large-scale production of wearable electronic textiles.

Sulphur-doped banana peel-derived activated carbon as electrode materials for supercapacitors

2019 ◽  
Vol 15 (1/2) ◽  
pp. 181
Author(s):  
Feng Yu ◽  
Lei Shi ◽  
Hui Chen ◽  
Zhuangzhi Zhao ◽  
Peirong Qi ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Electrode Materials ◽  
Banana Peel

Structural and electrochemical properties of babassu coconut mesocarp-generated activated carbon and few-layer graphene

Carbon ◽  
2019 ◽  
Vol 145 ◽  
pp. 175-186 ◽  
Author(s):  
Anupama Ghosh ◽  
Claudia do Amaral Razzino ◽  
Archi Dasgupta ◽  
Kazunori Fujisawa ◽  
Laís Helena S. Vieira ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Electrochemical Properties ◽  
Layer Graphene ◽  
Few Layer Graphene ◽  
Coconut Mesocarp
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