One-dimensional Vanadium Oxide Nanowires: Experimental Synthesis and Investigation of the Electrochemical Behaviors for Energy Storage
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1. The document discusses the experimental synthesis of 1D vanadium oxide nanowires for use as an electrode material in supercapacitors. It aims to improve the electrochemical stability and energy storage capacity of vanadium pentoxide. 2. The initial experiments found that vanadium pentoxide nanowires suffered from structural degradation and chemical dissolution issues during cycling. 3. To address this, the researchers developed a strategy of growing vanadium oxide on exfoliated carbon cloth substrates and introducing mixed valence states into the material through electrochemical treatments. This led to significantly improved cycling stability performance over 50 cycles.
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This document discusses the use of cyclic voltammetry and nanoparticles for sensor applications. It provides background on cyclic voltammetry, describing how it is used to study redox processes and electron transfer reactions. The document then reviews several studies where nanoparticles were used as sensors in cyclic voltammetry experiments. Specifically, it summarizes research where copper zinc aluminum oxide nanoparticles detected lead and tin at millimolar concentrations within 3 seconds. It also summarizes work where lanthanum silicate nanoparticles doped with rare earth ions sensed paracetamol at the millimolar level within 3 seconds, showing potential for sensitive and rapid detection of medicines.
An Introduction to super capacitors by M.Aadil.
An Introduction to super capacitors by M.Aadil.Lecturer Chemistry at Govt. Degree College Makhdoom Aali
Supercapacitors are energy storage devices that provide higher power densities than batteries. They store energy through static charge at the electrode-electrolyte interface rather than through faradaic reactions like batteries. Common electrode materials used in supercapacitors include carbon-based materials, transition metal oxides, and conducting polymers. The energy density of supercapacitors can be improved by using materials with high specific capacitance, increasing the potential window of the electrolyte, and developing asymmetric electrode configurations. Electrochemical characterization techniques like cyclic voltammetry and electrochemical impedance spectroscopy are used to analyze the capacitive performance of electrode materials.Hybrid Mxene-li-ion battery Supercapacitor
Here's an abstract for the presentation titled "Integration of Mxene Supercapacitor and Li-ion Battery"
---
**Abstract**
The integration of Mxene supercapacitors and Li-ion batteries represents a promising advancement in energy storage technology, combining the high power density of supercapacitors with the high energy density of Li-ion batteries. This presentation explores the working principles, challenges, and potential solutions for enhancing the performance of these hybrid systems.
Mxenes, a class of two-dimensional materials comprising transition metal carbides, nitrides, and carbonitrides, exhibit unique properties such as high electrical conductivity, large specific surface area, and tunable surface chemistry, making them suitable for supercapacitor applications. However, issues such as aggregation, hydrophilicity, and synthesis challenges must be addressed to fully leverage their potential.
The presentation delves into various approaches to overcome the energy density limitations of traditional supercapacitors, including the use of asymmetric supercapacitors, graphene hybrids, and nanostructured materials. It also highlights the synthesis processes for Mxenes, comparing methods like hydrofluoric acid etching, fluoride salt etching, molten salt etching, ionic liquid etching, and electrochemical etching, along with their respective advantages and disadvantages.
A detailed comparison of Mxene supercapacitors, Li-ion batteries, and hybrid systems is provided, focusing on parameters such as capacitance, energy density, power density, cycle life, conductivity, and structural stability. The integration challenges, including electrolyte compatibility, electrode balancing, and safety concerns, are discussed, emphasizing the need for efficient and scalable synthesis techniques and a deeper understanding of charge storage mechanisms.
Finally, the future potential of Mxene-carbon hybrids for supercapacitors is explored, outlining prospective directions for research and development in this field. The findings presented underscore the significant role of Mxene-based hybrid systems in advancing energy storage solutions for applications requiring high power and energy density, such as portable electronics and electric vehicles.
Electrochemical Characterization of Electrocatalysts .pptx
This document summarizes an electrochemistry workshop presentation on electrocatalyst characterization. It introduces common electrochemical characterization methods like cyclic voltammetry and discusses key figures of merit for evaluating electrocatalyst activity. Examples are provided of electrocatalyst development for important reactions like hydrogen evolution, oxygen evolution, and oxygen reduction. These include developing non-precious metal catalysts and improving catalyst stability and performance through methods like decreasing platinum loading or synthesizing metal phosphides and metal oxides on supports.
2017 MRS Spring Meeting Presentation Slides
Three-dimensional Nitrogen-doped Graphene Aerogels Enhance Power Density of Microbial Fuel Cells (oral presentation, NM3.1.06, 2017 MRS Spring Meeting and Exhibit, Phoenix, AZ, 2017)
2017 ACS Spring National Meeting Presentation Slides
This document discusses strategies to improve the cycling stability of polypyrrole electrodes for supercapacitors. It summarizes that polypyrrole suffers from poor cycling stability due to structural pulverization and counter-ion drain. The author investigated using a soft functionalized exfoliated graphite substrate and immobilizing counter-ion dopants like beta-naphthalene sulfonate to address these issues. Experimental results showed the functionalized exfoliated graphite substrate and immobilized counter-ion dopant led to a polypyrrole electrode with 97% capacitance retention after 10,000 charge-discharge cycles, demonstrating excellent cycling durability.
Tesi master Ram Khrishna Thakur
The lowest possible surface resistivity and higher accelerating field are the paramount
considerations, hence are obligatory for accelerating cavities. Since, superconducting materials
are used to make radio-frequency cavities for future accelerators. In the case of rf cavities,
superconductors are being used in order to minimize the power dissipated and increase the
figures of merit of a radio-frequency cavity, such as the quality factor and accelerating gradient.
Hence, these could be achieved by improving surface treatment to the cavity, and processing
techniques must be analyzed in order to optimize these figures of merit.
The research work reported in this dissertation mainly carried out on tesla type seamless 6GHz
Nb and Cu cavities. We have developed two innovative techniques: firstly, for mechanical
polishing of cavities, and secondly for purification of these cavities at atmospheric pressure under
cover of 4Helium gas (for protection) and at ultra-high vacuum (UHV) system. These cavities are
fabricated by spinning technology to create seamless cavities.
The main advantages of 6 GHz bulk-Nb cavities are saving cost, materials and time to collect
statistics of surface treatments and RF test in a very short time scale. Cavities are RF tested
before and after high temperature treatment under atmospheric pressure (under cover of inert gas
atmosphere to protect inner and outer surface of cavity) inside transparent quartz tube, and under
UHV conditions. Induction heating method is used to anneal the cavity at temperatures higher
than 2000°C and close to the melting point of Nb for less than a minute while few seconds at
maximum temperature. Before RF test and UHV annealing, the surface treatment processes like
tumbling, chemical, electro-chemical (such as BCP and EP), ultrasonic cleaning and high
pressure rinsing (HPR) have been employed. High temperature treatment for few minutes at
atmospheric pressure allow to reduce hydrogen, oxygen and other elemental impurities, which
effects on cavity Q-factor degradation, hence recovers rf performances of these cavities. This
research work will address these problems and illustrate the importance of surface treatments.
Aabc'15 paper
The document summarizes research on supercapacitor technology conducted by YUNASKO. It finds that:
1) The inner resistance and RC-constant of carbon-carbon supercapacitors can be reduced to a limit of 0.05 seconds through design improvements, allowing for power densities up to 200 kW/kg.
2) Operating temperatures up to 100°C and voltages up to 3V are achievable through new electrolyte formulations but limits energy density to 6-7 Wh/kg.
3) Hybrid devices combining battery and supercapacitor electrodes can substantially increase energy density to 50-60 Wh/kg while maintaining high power, though limiting cycle life to around 10,000 cycles.
Understanding ionic structure and dynamics in novel electrolytes; Paving the ...
Understanding ionic structure and dynamics in novel electrolytes; Paving the ...Trinity College Dublin
Understanding ionic structure and dynamics in novel electrolytes; Paving the way to improved energy storage by Maria ForsythPrinted Supercapacitors
Printed supercapacitors based on graphene and other carbon materials show promise for energy storage applications. Supercapacitors provide higher power density than batteries and longer lifespan than electrolytic capacitors. Graphene is a promising material for supercapacitors due to its large surface area, high conductivity, short ion diffusion path, and ability to be manufactured at scale. Methods for producing graphene-based supercapacitors include direct laser writing, lithography, and direct printing of graphene inks. These graphene microsupercapacitors show energy densities comparable to lithium-ion batteries with orders of magnitude higher power density. Further cost reductions could enable broader adoption of printed supercapacitors for portable devices, electric vehicles, and stationary energy storage.
Machine Learning Platform for Catalyst Design
This project aims to develop new electrocatalyst materials for nitrate removal from water using machine learning and computational screening. The team performed calculations on over 1,000 potential compositions to identify promising catalysts with low costs. Experimental synthesis of candidates such as ZnNi and Zn3Co was attempted but it is unclear if the desired alloys were produced. The screening approach is now being applied to identify materials for selenium removal. If successful, low-cost catalysts could be developed to reduce the costs of electrocatalytic water treatment.
NREL PV seminar
The document summarizes research on photoferroic materials for solar cell applications. It discusses computational studies of the electronic and optical properties of three candidate photoferroic minerals: enargite, stephanite, and bournonite. The studies show they have suitable bandgaps and absorption properties. Rashba splitting was also found in bournonite. The document then discusses how defects could be tolerated in these materials through shallow defect levels related to their electronic structure. Finally, methods for further computational investigation of defects and spontaneous polarization are presented.
Process Intensification
The document discusses process intensification, including its history, components, methods, and case studies. Process intensification aims to shrink the size of chemical plants while increasing efficiency. It can reduce environmental impact and costs. Case studies on producing olefins from natural gas, water treatment, and power generation from waste were presented. Simulation of the waste to power process was described along with the thermodynamic packages used.
Lithium Ion Batteries: Going the Distance (Feb 2011)
Axeon is a European manufacturer of lithium-ion battery systems for electric vehicles, energy storage, and power tools. It has partnerships with major cell suppliers and conducts research and development projects to advance battery technology, including projects to develop higher energy density cells using nano-coated lithium iron phosphate, silicon-tin alloys, and lithium-sulfur chemistries. Axeon is working on these technologies through collaborations with universities and companies to improve automotive battery performance and enable longer electric vehicle ranges.
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2017 ACS Spring National Meeting Presentation Slides
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Understanding ionic structure and dynamics in novel electrolytes; Paving the ...
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Zipping Up Ni-Fe Hydroxide-Coated Hematite Nanowires
This document summarizes research on a hematite photoanode coated with a nickel-iron hydroxide catalyst layer for water splitting. The coating was applied via a "zippering" method using sodium citrate to provide a conformal, void-free layer on hematite nanowire arrays. Characterization showed the coating achieved intimate contact between the hematite and catalyst. Photoelectrochemical tests demonstrated the coated electrode had a lower oxygen evolution reaction turn-on potential, higher charge transfer efficiency, and greater stability compared to uncoated hematite. The zippered interface improved the photoanode performance for water oxidation.
3D-Printing of Three-Dimensional Graphene Aerogels with Periodic Macropores f...
The document summarizes research on 3D printing graphene aerogel electrodes for supercapacitors. It discusses:
1. The motivation for developing porous thick electrode architectures to achieve both high capacitance from active material loading and high power density from fast ion diffusion.
2. A method for 3D printing graphene aerogels with periodic macropores using direct ink writing to facilitate ion transport and improve rate capability.
3. Further work on modifying the graphene surfaces through ion intercalation and deposition of MnO2 to boost capacitance.
4. The summaries concludes the 3D printing approach enables fabrication of electrodes that balance high capacitance, power density, and rate capability for supercapacitor applications.
20180323 electrospinning and polymer nanofibers
Electrospinning uses electric fields to produce polymer nanofibers. It works by applying a high voltage to a polymer solution, forming a Taylor cone and whipping jet that dries into nanofibers collected on a grounded target. Key parameters that affect fiber diameter are polymer concentration and viscosity, applied voltage, injection rate, and collector pattern. Electrospun nanofibers have various applications including tissue engineering scaffolds, filtration membranes, sensors, and energy storage devices like batteries.
20180320 polymer based nanomaterials for supercapacitors
The slides for a guest lecture of a graduate course (Chem 6564) offered by the Department of Chemistry, Virginia Polytechnic Institute and State University.
2017 ECS San Francisco Section Cubicciotti Award Ceremony Talk
Invited by the Electrochemical Society San Francisco Section to give the presentation to highlight my research and extracurricular activities. The award ceremony was held on the campus of UC Berkeley.
2017 Graduate Research Symposium Presentation Slides
This document summarizes the design and lessons learned from an undergraduate chemistry course on nanomaterials for energy storage devices. The course had 8 students, weekly lectures and lab sections, and was evaluated based on lab reports (65%), presentations (20%), and a final exam (10%). Lessons learned include assigning different peer-review weights, setting clearer expectations, avoiding over-expecting student self-motivation, and exposing students to advanced instruments for motivation. Overall student feedback for the instructor and course experience was very positive at 4.8/5.
2017 ACS Spring National Meeting Presentation Slides
Improving the Capacitance of Graphene Aerogel Electrodes via a Facile Ion-intercalation Strategy (oral presentation, ENFL #162, 253rd ACS National Meeting, San Francisco, CA, 2017)
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Three-dimensional Hierarchical Porous Carbon Foam Derived from Chitosan Aerogel for Electrical Double Layer Capacitors (oral presentation, EC2.12.10, 2016 MRS Fall Meeting and Exhibit, Boston, MA, 2016)
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dtubbenhauer@gmail.com
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One-dimensional Vanadium Oxide Nanowires: Experimental Synthesis and Investigation of the Electrochemical Behaviors for Energy Storage
- 1. 1D Vanadium Oxide Nanowires: Experimental Synthesis and Investigation of the Electrochemical Behaviors for Energy Storage Dr. Tianyu LIU Yat Li Lab Department of Chemistry and Biochemistry University of California, Santa Cruz 11/2017 NM03.05.04
- 2. Outline Background of Supercapacitors Motivation –Vanadium Oxide Our Strategy Experimental Results and An Observation Further Investigations Summary
- 3. Outline Background of Supercapacitors Motivation –Vanadium Oxide Our Strategy Experimental Results and An Observation Further Investigations Summary
- 4. Supercapacitors Electrochemical energy storage devices ChargingTime LiuT. et al., J. Mater. Chem.A, 2017, 5, 17705-17733 < 1s to ~100 s ~ hours (Supercapacitors) (Batteries) vs.
- 5. Capacitance 𝐂𝐚𝐩𝐚𝐜𝐢𝐭𝐚𝐧𝐜𝐞(𝐅) = Capacity (C) Potential Window (V) A measure of the amount of charge (energy) stored A figure-of-merit of electrode materials for supercapacitors
- 6. Capacitance Mechanisms Electrical Double Layer Capacitance Pseudo- capacitance Activated Carbon, CNT, Graphene etc. Conjugated polymers, metal oxides etc. ES04.11.03 Wed, 8:45 am – 9:00 am Hynes, Level 3, Ballroom A
- 7. Vanadium Pentoxide (V2O5) Pseudocapacitance (in LiCl aqueous electrolyte) V2O5 + 𝑥Li+ + 𝑥𝑒− ↔ LixV2O5 VO5High charge storage capability Ease of fabrication Inexpensiveness One-dimensional morphology + - Current Collector Utilization efficiency Ion diffusion
- 8. Outline Background of Supercapacitors Motivation –Vanadium Oxide Our Strategy Stability Results and A Discovery In-depth Investigations Summary
- 9. The story begins with... Structure Degradation Instability Li+ Peel off Soft substrates
- 10. The story begins with... Chemical Dissolution Instability V2O5 H2VO4 - HVO4 2- Water Soluble V5+
- 11. The story begins with... Chemical Dissolution Instability V2O5 VO2 H2VO4 - HVO4 2- V5+ V4+ Yu et al., Adv. Funct. Mater., 2015, 25, 3534-3540 Water Soluble
- 12. Instable Vanadium Pentoxide Stable Soft substrates Mixed valence states
- 13. Outline Background of Supercapacitors Motivation –Vanadium Oxide Our Strategy Experimental Results and An Observation Further Investigations Summary
- 14. Exfoliated Carbon Cloth Commercialized Carbon Cloth (CC) 0.5 M KNO3 1.9 V, 3 h 50 mL N2H4 (H2O) 50 oC, 1 h Exfoliated Carbon Cloth (ECC) O V O O O O V O O O ECCCC
- 15. Introduction of Mixed-Valence States b c -1.5 V ~ 1.4 V, 50 cycles, 50 mV/s 0.1 M VOSO4, 0.2 M NH4OAc -1.5 V, 1 min a 2 μm VOx RVOx ECC ECC/RVOx
- 16. Outline Background of Supercapacitors Motivation –Vanadium Oxide Our Strategy Experimental Results and An Observation Further Investigations Summary
- 17. Cycling Stability Performance 4 μm 200 nm 4 μm 200 nm 4 μm 200 nm
- 19. Outline Background of Supercapacitors Motivation –Vanadium Oxide Our Strategy Experimental Results and An Observation Further Investigations Summary
- 20. Uptake of structural water Investigation
- 21. Investigation Uptake of structural water Electrochemical Impedance Spectroscopy (EIS) Slope ∝(Diffusion Resistance)-1
- 22. Outline Background of Supercapacitors Motivation –Vanadium Oxide Our Strategy Experimental Results and An Observation Further Investigations Summary
- 23. Summary Pseudo-capacitive Materials 1D Vanadium Pentoxide Uptake of Structural Water 200 nm Instability Activation?
- 24. Acknowledgements Prof. Yat Li Group, UCSC Dr. Yu Song
- 25. ES04.11.03 8:45 am – 9:00 am, 11/29 Hynes Level 3, Ballroom A Carbon Aerogels with Multiscale Pores for Supercapacitors You are more than welcome to attend: