scholarly journals Aerogels Utilization in Electrochemical Capacitors

2020 ◽  
Author(s):  
Ranganatha Sudhakar
Keyword(s):  
Energy Storage ◽  
Electrode Materials ◽  
Mechanical Stability ◽  
High Surface ◽  
High Surface Area ◽  
Electrochemical Supercapacitors ◽  
Storage Mechanism ◽  
Energy Conversion And Storage ◽  
Electrochemical Double Layer ◽  
And Performance

Supercapacitors are the integral part of electrochemical energy conversion and storage media. Energy storage mechanism is different in supercapacitors compared to batteries and results in exhibition of excellent power density. The supercapacitor performance is sensitive to material used as electrode, nature of electrolyte, etc. and the very significant is electrode surface nature. Based on the type of energy storage mechanism, supercapacitors are divided as electrochemical double-layer capacitors and pseudocapacitors. There is a practice to have both kind of these materials as electrode materials to achieve high electrochemical performance. Aerogels with inherent characteristics such as large pores, very high surface area, and superior mechanical stability make them superior candidates for electrode materials for high performance electrochemical supercapacitors. In this chapter, aerogels derived from different sources, their suitability and performance in view of electrochemical supercapacitors are discussed.

scholarly journals SYNTHESIS AND APPLICATION OF CNT BASED ENERGY STORAGE AND CONVERSION DEVICES

2021 ◽  
Author(s):  
KUMAR AAYUSH ◽  
Abhishek Bhardwaj ◽  
SHIVAM SHANDILYA ◽  
SANKET BHALERAO
Keyword(s):  
Energy Storage ◽  
High Surface ◽  
High Surface Area ◽  
Energy Storage And Conversion ◽  
Tubular Structures ◽  
One Dimensional ◽  
Good Material ◽  
Energy Conversion And Storage ◽  
Conversion Materials ◽  
And Storage

Carbon nanotubes (CNTs) are one-dimensional tubular structures of carbon that have attracted much attention due to their potential to be used in various fields like energy storage/conversion devices, biosensing devices, drug delivery systems to name a few. Their excellent electrochemical properties like electron mobility, electrical and thermal conductivity, and high surface area make them good material for use in energy storage and conversion materials. The most promising research in the synthesis and applications of CNTs toward energy conversion and storage is highlighted along with limitations faced in mass production.

scholarly journals SYNTHESIS AND APPLICATION OF CNT BASED ENERGY STORAGE AND CONVERSION DEVICES

2021 ◽  
Author(s):  
KUMAR AAYUSH ◽  
Abhishek Bhardwaj ◽  
SHIVAM SHANDILYA ◽  
SANKET BHALERAO
Keyword(s):  
Energy Storage ◽  
High Surface ◽  
High Surface Area ◽  
Energy Storage And Conversion ◽  
Tubular Structures ◽  
One Dimensional ◽  
Good Material ◽  
Energy Conversion And Storage ◽  
Conversion Materials ◽  
And Storage

Carbon nanotubes (CNTs) are one-dimensional tubular structures of carbon that have attracted much attention due to their potential to be used in various fields like energy storage/conversion devices, biosensing devices, drug delivery systems to name a few. Their excellent electrochemical properties like electron mobility, electrical and thermal conductivity, and high surface area make them good material for use in energy storage and conversion materials. The most promising research in the synthesis and applications of CNTs toward energy conversion and storage is highlighted along with limitations faced in mass production.

Nanocomposites for Electrochemical Energy Storage - An Overview

2017 ◽  
Vol 735 ◽  
pp. 189-193
Author(s):  
Priscila Tamiasso-Martinhon ◽  
Sousa Célia
Keyword(s):  
Energy Storage ◽  
High Performance ◽  
Electrode Materials ◽  
Modern Society ◽  
Cost Effective ◽  
Energy Storage And Conversion ◽  
Research Activity ◽  
Energy Field ◽  
Electrochemical Double Layer ◽  
And Performance

Energy storage and conversion are major problems of our modern society. In the last decades, in order to minimize these problems, a growing research activity was dedicated to the development of new systems involved in this energy field. The fabrication of supercapacitors based on new materials, such as electrochemical double layer capacitor, can offer attractive potentialities. Indeed, these supercapacitors are able to provide a power density ten times higher than that supplied by batteries, and allow a larger number of charge and discharge cycles. The performance of supercapacitors highly depends on the properties of electrode materials. Ternary composites combining both capacitive and faradaic reactions can address the improvement necessary for relatively cost effective and performance of supercapacitors. Particularly, ternary nanocomposites systems of carbon nanotubes (CNTs), conducting polymer (CPs) films and metal oxide/hydroxide; CNT:CP:Metal oxide; has been proposed as potential electrodes for electrochemical supercapacitors, as alternatives to overcome the drawbacks associated with single component electrodes for the construction of high performance supercapacitors.

A method to obtain a Ragone plot for evaluation of carbon nanotube supercapacitor electrodes

2010 ◽  
Vol 25 (8) ◽  
pp. 1500-1506 ◽  
Author(s):  
Akshay S. Raut ◽  
Charles B. Parker ◽  
Jeffrey T. Glass
Keyword(s):  
Carbon Nanotube ◽  
Energy Storage ◽  
Power Density ◽  
Electric Vehicles ◽  
Specific Energy ◽  
High Surface ◽  
High Surface Area ◽  
Ragone Plot ◽  
Electrochemical Double Layer ◽  
Power Densities

Electrochemical double layer capacitors, also referred to as supercapacitors, are a promising technology in the field of energy storage. Carbon nanotube (CNT)-based supercapacitors are particularly interesting because of CNTs' high surface area and conductivity. CNT supercapacitors can potentially be used in hybrid electric vehicles due to their higher power density. Comparing energy storage systems that store energy in different ways, such as batteries, fuel cells, supercapacitors, and flywheels, requires that an appropriate set of performance data be collected. A Ragone plot is a log-log plot of a device's energy density versus power density, giving insight into its operational range. A method to obtain Ragone plots for CNT-based supercapacitors in a three-terminal electrochemical cell was adapted from a technique to test commercial capacitors for electric vehicles. Ragone plots for different types of as-grown CNT electrodes in different electrolytes are presented, along with the procedural details of this new method to obtain electrode-specific energy and power densities. Additionally, a theoretical weight calculation for a carbon nanotube film was derived and validated with a direct weight measurement of a CNT film. This weight was used in the specific energy and power densities for the Ragone plot.

scholarly journals Synthesis, properties, and performance of nanostructured metal oxides for supercapacitors

2014 ◽  
Vol 86 (5) ◽  
pp. 611-632 ◽  
Author(s):  
Deepak P. Dubal ◽  
Rudolf Holze
Keyword(s):  
Metal Oxides ◽  
Double Layer ◽  
Electrode Materials ◽  
High Surface ◽  
High Surface Area ◽  
Synthesis Properties ◽  
And Performance ◽  
Nanostructured Metal Oxides ◽  
Power Capability ◽  
Nanostructured Metal

AbstractBeyond activated carbon and other forms of high-surface area carbon operating solely as double layer storage materials in capacitors of high capacitance commonly somewhat imprecisely called supercapacitors other electrode materials storing electric charge by reversible and fast superficial redox processes are studied as active masses. The resulting devices combining double layer and Faradaic process-based charge storage – commonly called hybrid ones – show significantly higher capacitances at only marginally diminished power capability. Among the suggested materials metal oxides feature most prominently. Their formation, characterization and properties together with the performance of prepared devices are reviewed here.

Facile Synthesis of Cu2O nanoparticle-loaded Carbon Nanotubes Composite Catalysts for Reduction of 4-Nitrophenol

2020 ◽  
Vol 16 (4) ◽  
pp. 617-624 ◽  
Author(s):  
Yao Feng ◽  
Ran Wang ◽  
Juanjuan Yin ◽  
Fangke Zhan ◽  
Kaiyue Chen ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Mechanical Stability ◽  
Catalytic Reduction ◽  
High Surface ◽  
High Surface Area ◽  
Reduction Reaction ◽  
Cycle Performance ◽  
Simple Method ◽  
Composite Catalysts ◽  
Cu2o Nanoparticles

Background: 4-nitrophenol (4-NP) is one of the pollutants in sewage and harmful to human health and the environment. Cu is a non-noble metal with catalytic reduction effect on nitro compounds, and.has the advantages of simple preparation, abundant reserves, and low price. Carbon nanotubes (CNT) are widely used for substrate due to their excellent mechanical stability and high surface area. In this study, a simple method to prepare CNT-Cu2O by controlling different reaction time was reported. The prepared nanocomposites were used to catalyze 4-NP. Methods: CNTs and CuCl2 solution were put into a beaker, and then ascorbic acid and NaOH were added while continuously stirring. The reaction was carried out for a sufficiently long period of time at 60°C. The prepared samples were dried in a vacuum at 50°C for 48 h after washing with ethyl alcohol and deionized water. Results: Nanostructures of these composites were characterized by scanning electron microscope and transmission electron microscopy techniques, and the results at a magnification of 200 nanometers showed that Cu2O was distributed on the surface of the CNTs. In addition, X-ray diffraction was performed to further confirm the formation of Cu2O nanoparticles. The results of ultraviolet spectrophotometry showed that the catalytic effect of the compound on 4-NP was obvious. Conclusions: CNTs acted as a huge template for loading Cu2O nanoparticles, which could improve the stability and cycle performance of Cu2O. The formation of nanoparticles was greatly affected by temperature and the appropriate concentration, showing great reducibility for the 4-NP reduction reaction.

Synthesis of high surface area and functionalized nanoporous biocarbons and their efficiency for CO2 capture and supercapacitors

2021 ◽  
Author(s):  
Gurwinder Singh ◽  
Rohan Bahadur ◽  
Ajanya Maria Ruban ◽  
Jefrin Marykala Davidraj ◽  
Dawei Su ◽  
...  
Keyword(s):  
Energy Storage ◽  
Surface Area ◽  
Co2 Capture ◽  
Water Purification ◽  
High Surface ◽  
High Surface Area ◽  
Energy Storage And Conversion ◽  
Waste Biomass ◽  
Fabrication Technology ◽  
Significant Attention

Nanoporous biocarbons derived from waste biomass have created significant attention owing to their great potential for energy storage and conversion and water purification. However, the fabrication technology for these materials...

scholarly journals Design Considerations for Borehole Thermal Energy Storage (BTES): A Review with Emphasis on Convective Heat Transfer

Geofluids ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-26 ◽  
Author(s):  
Helge Skarphagen ◽  
David Banks ◽  
Bjørn S. Frengstad ◽  
Harald Gether
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Theoretical Calculations ◽  
High Surface ◽  
High Surface Area ◽  
Volume Ratio ◽  
Thermal Recovery ◽  
Conductive Heat ◽  
Geological Environment

Borehole thermal energy storage (BTES) exploits the high volumetric heat capacity of rock-forming minerals and pore water to store large quantities of heat (or cold) on a seasonal basis in the geological environment. The BTES is a volume of rock or sediment accessed via an array of borehole heat exchangers (BHE). Even well-designed BTES arrays will lose a significant quantity of heat to the adjacent and subjacent rocks/sediments and to the surface; both theoretical calculations and empirical observations suggest that seasonal thermal recovery factors in excess of 50% are difficult to obtain. Storage efficiency may be dramatically reduced in cases where (i) natural groundwater advection through the BTES removes stored heat, (ii) extensive free convection cells (thermosiphons) are allowed to form, and (iii) poor BTES design results in a high surface area/volume ratio of the array shape, allowing high conductive heat losses. The most efficient array shape will typically be a cylinder with similar dimensions of diameter and depth, preferably with an insulated top surface. Despite the potential for moderate thermal recovery, the sheer volume of thermal storage that the natural geological environment offers can still make BTES a very attractive strategy for seasonal thermal energy storage within a “smart” district heat network, especially when coupled with more efficient surficial engineered dynamic thermal energy stores (DTES).

scholarly journals Liquid Phase Synthesis of CoP Nanoparticles with High Electrical Conductivity for Advanced Energy Storage

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Guo-Qun Zhang ◽  
Bo Li ◽  
Mao-Cheng Liu ◽  
Shang-Ke Yuan ◽  
Leng-Yuan Niu
Keyword(s):  
Electrical Conductivity ◽  
Energy Storage ◽  
Liquid Phase ◽  
Specific Capacitance ◽  
Current Density ◽  
High Surface ◽  
High Surface Area ◽  
High Energy ◽  
High Energy Density ◽  
Energy Storage Materials

Transition metal phosphide alloys possess the metalloid characteristics and superior electrical conductivity and are a kind of high electrical conductive pseudocapacitive materials. Herein, high electrical conductive cobalt phosphide alloys are fabricated through a liquid phase process and a nanoparticles structure with high surface area is obtained. The highest specific capacitance of 286 F g−1 is reached at a current density of 0.5 A g−1. 63.4% of the specific capacitance is retained when the current density increased 16 times and 98.5% of the specific capacitance is maintained after 5000 cycles. The AC//CoP asymmetric supercapacitor also shows a high energy density (21.3 Wh kg−1) and excellent stability (97.8% of the specific capacitance is retained after 5000 cycles). The study provides a new strategy for the construction of high-performance energy storage materials by enhancing their intrinsic electrical conductivity.

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