scholarly journals Research Progress of Graphene-Based Materials on Flexible Supercapacitors

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 892
Author(s):  
Yongquan Du ◽  
Peng Xiao ◽  
Jian Yuan ◽  
Jianwen Chen
Keyword(s):  
Flexible Electronics ◽  
Electrode Materials ◽  
Graphene Quantum Dots ◽  
High Specific Surface Area ◽  
Research Progress ◽  
Flexible Electrodes ◽  
Long Cycle Life ◽  
Advantages And Disadvantages ◽  
Flexible Supercapacitors ◽  
Materials Used

With the development of wearable and flexible electronic devices, there is an increasing demand for new types of flexible energy storage power supplies. The flexible supercapacitor has the advantages of fast charging and discharging, high power density, long cycle life, good flexibility, and bendability. Therefore, it exhibits great potential for use in flexible electronics. In flexible supercapacitors, graphene materials are often used as electrode materials due to the advantages of their high specific surface area, high conductivity, good mechanical properties, etc. In this review, the classification of flexible electrodes and some common flexible substrates are firstly summarized. Secondly, we introduced the advantages and disadvantages of five graphene-based materials used in flexible supercapacitors, including graphene quantum dots (GQDs), graphene fibers (GFbs), graphene films (GFs), graphene hydrogels (GHs), and graphene aerogels (GAs). Then, we summarized the latest developments in the application of five graphene-based materials for flexible electrodes. Finally, the defects and outlooks of GQDs, GFbs, GFs, GHs, and GAs used in flexible electrodes are given.

scholarly journals Research status and future development of biomass liquid fuels

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 4523-4543
Author(s):  
Ji Zhang ◽  
Junling Yang ◽  
Huafu Zhang ◽  
Zhentao Zhang ◽  
Yu Zhang
Keyword(s):  
Future Development ◽  
Liquid Fuel ◽  
Raw Materials ◽  
Jet Fuel ◽  
Liquid Fuels ◽  
Research Progress ◽  
Future Research ◽  
Fuel Production ◽  
Advantages And Disadvantages ◽  
Materials Used

Due to the combined pressures of energy shortage and environmental degradation, bio-liquid fuels have been widely studied as a green, environmentally friendly, renewable petroleum alternative. This article summarizes the various technologies of three generations of biomass feedstocks (especially the second-generation, biomass lignin, and the third-generation, algae raw materials) used to convert liquid fuels (bioethanol, biodiesel, and bio-jet fuel) and analyzes their advantages and disadvantages. In addition, this article details the latest research progress in biomass liquid fuel production, summarizes the list of raw materials, products and conversion processes, and provides personal opinions on its future development. The aim is to provide a theoretical basis and reference for the optimization of existing technology and future research and development of biomass liquid fuels.

scholarly journals CNT-based Materials as Electrodes for Flexible Supercapacitors

2021 ◽  
Vol 7 (3) ◽  
pp. 151-162
Author(s):  
Gabriela Queirós ◽  
Natalia Rey-Raap ◽  
Clara Pereira ◽  
Manuel Fernando R. Pereira
Keyword(s):  
Energy Storage ◽  
Carbon Nanomaterials ◽  
Electrode Materials ◽  
Short Review ◽  
High Energy ◽  
High Energy Density ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Flexible Supercapacitors ◽  
Materials Used

Supercapacitors are energy storage devices that have received much interest in the past decade. These devices have unique characteristics, such as high energy density, fast charging, extensive life cycle, and excellent stability. Currently, wearable electronic gadgets have appeared as an interesting application for flexible supercapacitors, in which lightness and flexibility of the electrodes are two of the most important properties. In addition, the materials used as electrodes severely affect the behavior of these devices. Carbon nanomaterials are the most proficient and most studied electrode materials in flexible supercapacitors. Among them, carbon nanotubes (CNTs) have been extensively studied owing to their excellent mechanical and electrical properties. Therefore, this short review focuses on the new progress in the use of CNT materials as electrodes in flexible energy storage devices.

scholarly journals Recent developments of advanced micro-supercapacitors: design, fabrication and applications

2020 ◽  
Vol 4 (1) ◽  
Author(s):  
Fan Bu ◽  
Weiwei Zhou ◽  
Yihan Xu ◽  
Yu Du ◽  
Cao Guan ◽  
...  
Keyword(s):  
Energy Storage ◽  
Flexible Electronics ◽  
High Performance ◽  
Electrode Materials ◽  
Rapid Development ◽  
Energy Storage Devices ◽  
Long Cycle Life ◽  
Recent Developments ◽  
On Chip ◽  
And Function

AbstractThe rapid development of wearable, highly integrated, and flexible electronics has stimulated great demand for on-chip and miniaturized energy storage devices. By virtue of their high power density and long cycle life, micro-supercapacitors (MSCs), especially those with interdigital structures, have attracted considerable attention. In recent years, tremendous theoretical and experimental explorations have been carried out on the structures and electrode materials of MSCs, aiming to obtain better mechanical and electrochemical properties. The high-performance MSCs can be used in many fields, such as energy storage and medical assistant examination. Here, this review focuses on the recent progress of advanced MSCs in fabrication strategies, structural design, electrode materials design and function, and integrated applications, where typical examples are highlighted and analyzed. Furthermore, the current challenges and future development directions of advanced MSCs are also discussed.

Recent Patents on Valve Mechanism Device

2020 ◽  
Vol 13 (3) ◽  
pp. 230-241
Author(s):  
Ye Dai ◽  
Hui-Bing Zhang ◽  
Yun-Shan Qi
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Flow Direction ◽  
Research Progress ◽  
Valve Mechanism ◽  
Advantages And Disadvantages ◽  
Valve Structure ◽  
Valve Leakage ◽  
Safety And Reliability

Background: Valves are an important part of nuclear power plants and are the control equipment used in nuclear power plants. It can change the cross-section of the passage and the flow direction of the medium and has the functions of diversion, cutoff, overflow, and the like. Due to the earthquake, the valve leaks, which will cause a major nuclear accident, endangering people's lives and safety. Objective: The purpose of this study is to synthesize the existing valve devices, summarize and analyze the advantages and disadvantages of various devices from many literatures and patents, and solve some problems of existing valves. Methods: This article summarizes various patents of nuclear-grade valve devices and recent research progress. From the valve structure device, transmission device, a detection device, and finally to the valve test, the advantages and disadvantages of the valve are comprehensively analyzed. Results: By summarizing the characteristics of a large number of valve devices, and analyzing some problems existing in the valves, the outlook for the research and design of nuclear power valves was made, and the planning of the national nuclear power strategic goals and energy security were planned. Conclusion: Valve damage can cause serious safety accidents. The most common is valve leakage. Therefore, the safety and reliability of valves must be taken seriously. By improving the transmission of the valve, the problems of complicated valve structure and high cost are solved.

Electrode materials and device architecture strategies for flexible supercapacitors in wearable energy storage

2021 ◽  
Vol 9 (13) ◽  
pp. 8099-8128
Author(s):  
Xinyu Zhang ◽  
Changzhong Jiang ◽  
Jing Liang ◽  
Wei Wu
Keyword(s):  
Energy Storage ◽  
Electrode Materials ◽  
Flexible Supercapacitors ◽  
Device Architecture

Efficient strategies of electrode materials and the device architecture for wearable flexible supercapacitors have been systematically summarized.

scholarly journals Mechanochemistry-assisted synthesis of hierarchical porous carbons applied as supercapacitors

2017 ◽  
Vol 13 ◽  
pp. 1332-1341 ◽  
Author(s):  
Desirée Leistenschneider ◽  
Nicolas Jäckel ◽  
Felix Hippauf ◽  
Volker Presser ◽  
Lars Borchardt
Keyword(s):  
Electrode Materials ◽  
Liquid Electrolyte ◽  
High Specific Surface Area ◽  
Mechanochemical Reaction ◽  
Porous Carbons ◽  
Ionic Liquid Electrolyte ◽  
Hierarchical Porous ◽  
Hierarchical Porous Carbons ◽  
Double Layer Capacitors ◽  
Solvent Free Synthesis

A solvent-free synthesis of hierarchical porous carbons is conducted by a facile and fast mechanochemical reaction in a ball mill. By means of a mechanochemical ball-milling approach, we obtained titanium(IV) citrate-based polymers, which have been processed via high temperature chlorine treatment to hierarchical porous carbons with a high specific surface area of up to 1814 m2 g−1 and well-defined pore structures. The carbons are applied as electrode materials in electric double-layer capacitors showing high specific capacitances with 98 F g−1 in organic and 138 F g−1 in an ionic liquid electrolyte as well as good rate capabilities, maintaining 87% of the initial capacitance with 1 M TEA-BF4 in acetonitrile (ACN) and 81% at 10 A g−1 in EMIM-BF4.

Analysis of Advanced Research Methods of Cement-Based Materials

2014 ◽  
Vol 633 ◽  
pp. 494-497
Author(s):  
Yan Zheng ◽  
Su Ping Cui ◽  
Ya Li Wang ◽  
Zi Ming Wang ◽  
Qian Jin Mao
Keyword(s):  
Research Methods ◽  
Research Progress ◽  
Microstructural Development ◽  
Resonance Spectroscopy ◽  
Complex Phenomenon ◽  
Advantages And Disadvantages ◽  
Testing Method ◽  
Cement Based Materials ◽  
Microscopy Techniques ◽  
Application Prospects

The hydration of cement is known to be a complex phenomenon. Although the broad pattern of reactions and microstructural development are known, a number of important questions remain unanswered. How to select the proper techniques is what the research people think of for now. This paper reviewed the domestic and international research progress and presented the advantages and disadvantages of these methods and the application prospects. Nuclear magnetic resonance spectroscopy (NMR), nanoindentation and electron microscopy techniques of cements were expounded in detail. Furthermore, through analyzing the results obtained by different research methods, the paper predicted the development prospect of advanced testing method of cement-based materials.

Weldability and machinability of the dissimilar joints of Ti alloy and stainless steel – A review

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Yan Zhang ◽  
YuanBo Bi ◽  
JianPing Zhou ◽  
DaQian Sun ◽  
HongMei Li
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Bonding Temperature ◽  
Fusion Welding ◽  
Research Progress ◽  
Diffusion Welding ◽  
Ti Alloy ◽  
Dissimilar Joints ◽  
Advantages And Disadvantages ◽  
Fe Intermetallics

Abstract As two important industrial manufacturing materials, titanium alloys and stainless steel have their own advantages and disadvantages in terms of physical, chemical, and mechanical properties. The field of materials manufacturing has witnessed efforts to develop technical processes that can properly combine these two alloy types, aiming to effectively use their respective advantages. The welding technology for Ti alloy and stainless steel, as a research topic with broad prospects, is comprehensively and deeply analyzed in this review. The current research progress in this field was analyzed from different process perspectives such as fusion welding, brazing, diffusion welding, friction welding, explosive welding and vacuum hot-rolling welding. The results of the review showed that the greatest challenges of fusion welding are low ductility of the material, high residual stress, high cooling rate, and the formation of numerous brittle Ti-Fe intermetallics. By using appropriate intermediate materials between these two materials, the residual stress and brittle intermetallics near the interface of the transition joint can be minimised by solving the thermal expansion mismatch, reducing the bonding temperature and pressure, and suppressing the diffusion of elements such as Ti and Fe.

Recent Progress on Controlled Dielectrophoretic Assembly of Carbon Nanotubes

2012 ◽  
Vol 531-532 ◽  
pp. 485-489
Author(s):  
Chao Ding ◽  
Li Bao An ◽  
Xiao Xia Yang ◽  
Yan Yan Liu
Keyword(s):  
Carbon Nanotubes ◽  
Impedance Measurement ◽  
Research Progress ◽  
Mechanical And Thermal Properties ◽  
Single Electron Transistors ◽  
Advantages And Disadvantages ◽  
Field Emission Displays ◽  
Impedance Monitoring ◽  
Time Gap ◽  
Functional Components

Carbon nanotubes (CNTs) have drawn extensive research interest for a variety of applications in single electron transistors, field emission displays, interconnects, sensors, energy storage, composites, and many others due to their excellent electrical, mechanical, and thermal properties. One requirement for many of these applications is the need to integrate CNTs into various devices or circuits as functional components and different manipulation methods have been developed. This paper addresses the assembly of CNTs by dielectrophoresis (DEP) and reviews recent research progress of controlled assembly of CNTs. Totally six approaches are introduced in which different techniques including impedance measurement, optical induced DEP, floating electrode DEP, self-limiting resistor, fluidic assisted deposition, and real-time gap impedance monitoring of DEP are respectively used to control the yield of the DEP process. The advantages and disadvantages of these methods are analysed. The purpose is to help automating the DEP process of CNTs and other one-dimensional nanomaterials by presenting these advanced control techniques.

scholarly journals Research on Key Technology of Electrochemical Sterilization and Physical Application for Circulating Cooling Water

2021 ◽  
Vol 2083 (2) ◽  
pp. 022068
Author(s):  
Xiaohui Wang ◽  
Chunyan Song ◽  
Xueying Xie ◽  
Nan Zhang ◽  
Ruiqing Guo ◽  
...  
Keyword(s):  
Electric Fields ◽  
Electrode Materials ◽  
High Efficiency ◽  
Thermal Power ◽  
Cooling Water ◽  
Environmentally Friendly ◽  
Research Progress ◽  
Electrode Spacing ◽  
Experimental Conditions ◽  
Circulating Cooling Water

Abstract As a high-efficiency, low-cost, convenient and environmentally friendly sterilization technology, electrochemical disinfection has developed rapidly in recent years. Electrochemical sterilization is an environmentally friendly sterilization technology. The research progress of this technology in the recent 30 years in sterilization mechanism and electrode materials is summarized. The mechanism of electrochemical sterilization includes the chemical effects of active chlorine, active intermediates, copper or silver ions, and the physical effects of electric fields; the electrode materials used are titanium anode, carbon cathode, and anode. The article combined with electrochemical equipment in a thermal power plant cold open circulating cooling water treatment experiment. Experimental research found that under the conditions of current density of 120A/m2, residence time of 10s, and electrode spacing of 1.8cm, the bactericidal effect can reach 97%. Under certain experimental conditions and a certain period of time, the total number of heterogeneous bacteria in the circulating cooling water after treatment can be effectively inhibited.

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