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| --- | Co-I [[https://www.physics.wisc.edu/garage/GarrettFrankson|Garrett Frankson]] and [[https://www.physics.wisc.edu/garage/AustinJeffries|Austin Jeffries]] <<BR>> Current Status: Building Project Page ---- {{http://www.nature.com/ncomms/journal/v4/n2/images/ncomms2446-f1.jpg|Fabrication of LSG-MSC|width=600}} ---- === Project Overview === A capacitor is an electric energy storage device, often constructed with two layers of conducting foil separated by a paper-thin layer of insulator. The capacity is proportional to the area A and inversely proportional to the insulator thickness t, C~A/t. A supercapacitor has a atomic scale insulator thickness given by the solvation layer surrounding an ion in an electrolyte, and a large surface area. Supercapacitor values of 1-1000 F are now available commercially (see https://www.sparkfun.com/products/746) and approach the energy density of batteries while offering fast charge and discharge rates (high power density). For an introduction to graphene based supercapacitors, see http://vimeo.com/51873011. -duncan |
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| Relevant Publications [[http://www.nature.com/ncomms/journal/v4/n2/pdf/ncomms2446.pdf|Scalable fabrication of high-power graphene micro-supercapacitors for flexible and on-chip energy storage]] *Maher F. El-Kady & Richard B. Kaner *El-Kady and Kaner demonstrate a scalable fabrication of graphene micro-supercapacitors over large areas by direct laser writing on graphite oxide films. More than 100 micro-supercapacitors can be produced on a single disc in 30 min or less. The devices are built on flexible substrates for flexible electronics and on-chip uses. Remarkably, miniaturizing the devices to the microscale results in enhanced charge-storage capacity and rate capability. These microsupercapacitors demonstrate a power density of B200 W cm^-3, which is among the highest values achieved for any supercapacitor. [[http://pubs.acs.org.ezproxy.library.wisc.edu/doi/pdf/10.1021/ja01539a017|Preparation of Graphitic Oxide]] *William S. Hummers & Richard E. Offema *The conventional method for the preparation of graphitic oxide is time consuming and hazardous. Hummers and Offema have developed a rapid, relatively safe method for preparing graphitic oxide from graphite in what is essentially an anhydrous mixture of sulfuric acid, sodium nitrate and potassium permanganate. [[http://research.chem.psu.edu/mallouk/articles/cm981085u.pdf|Layer-by-Layer Assembly of Ultrathin Composite Films from Micron-Sized Graphite Oxide Sheets and Polycations]] *Nina I. Kovtyukhova et al. *For the synthesis of graphitic oxide, El-Kady and Kaner used a modified Hummers' method developed by Nina I. Kovtyukhova et al. |
---- === Project Goals === ===== Short Term Goals ===== 1. Create graphene micro-supercapacitor material using the methods outlined by El-Kady and Kaner. 2. Conduct a series of tests on how to maximize the amount of charge stored within each graphene micro-supercapacitor. ===== Long Term Goals ===== 1. Design an apparatus that can hold many graphene micro-supercapcitors in an efficient and usable way for use in application. 2. Experiment with powering small mobile devices (ie. a flash light, a watch, a cellphone) ---- === Relevant Publications === [[http://www.nature.com/ncomms/journal/v4/n2/pdf/ncomms2446.pdf|Scalable fabrication of high-power graphene micro-supercapacitors for flexible and on-chip energy storage]] *Maher F. El-Kady & Richard B. Kaner *El-Kady and Kaner demonstrate a scalable fabrication of graphene micro-supercapacitors over large areas by direct laser writing on graphite oxide films. More than 100 micro-supercapacitors can be produced on a single disc in 30 min or less. The devices are built on flexible substrates for flexible electronics and on-chip uses. Remarkably, miniaturizing the devices to the microscale results in enhanced charge-storage capacity and rate capability. These microsupercapacitors demonstrate a power density of ~200 W cm^-3^, which is among the highest values achieved for any supercapacitor. [[http://pubs.acs.org.ezproxy.library.wisc.edu/doi/pdf/10.1021/ja01539a017|Preparation of Graphitic Oxide]] *William S. Hummers & Richard E. Offema *The conventional method for the preparation of graphitic oxide is time consuming and hazardous. Hummers and Offema have developed a rapid, relatively safe method for preparing graphitic oxide from graphite in what is essentially an anhydrous mixture of sulfuric acid, sodium nitrate and potassium permanganate. [[http://research.chem.psu.edu/mallouk/articles/cm981085u.pdf|Layer-by-Layer Assembly of Ultrathin Composite Films from Micron-Sized Graphite Oxide Sheets and Polycations]] *Nina I. Kovtyukhova et al. *For the synthesis of graphitic oxide, El-Kady and Kaner used a modified Hummers' method developed by Nina I. Kovtyukhova et al. ---- === Finance === [[http://bit.ly/10ERnrN|Short term budget]] ---- |
Graphene Micro-Supercapacitors
Co-I Garrett Frankson and Austin Jeffries
Current Status: Building Project Page
Project Overview
A capacitor is an electric energy storage device, often constructed with two layers of conducting foil separated by a paper-thin layer of insulator. The capacity is proportional to the area A and inversely proportional to the insulator thickness t, C~A/t. A supercapacitor has a atomic scale insulator thickness given by the solvation layer surrounding an ion in an electrolyte, and a large surface area. Supercapacitor values of 1-1000 F are now available commercially (see https://www.sparkfun.com/products/746) and approach the energy density of batteries while offering fast charge and discharge rates (high power density). For an introduction to graphene based supercapacitors, see http://vimeo.com/51873011. -duncan
Project Goals
Short Term Goals
- Create graphene micro-supercapacitor material using the methods outlined by El-Kady and Kaner.
- Conduct a series of tests on how to maximize the amount of charge stored within each graphene micro-supercapacitor.
Long Term Goals
- Design an apparatus that can hold many graphene micro-supercapcitors in an efficient and usable way for use in application.
- Experiment with powering small mobile devices (ie. a flash light, a watch, a cellphone)
Relevant Publications
Maher F. El-Kady & Richard B. Kaner
El-Kady and Kaner demonstrate a scalable fabrication of graphene micro-supercapacitors over large areas by direct laser writing on graphite oxide films. More than 100 micro-supercapacitors can be produced on a single disc in 30 min or less. The devices are built on flexible substrates for flexible electronics and on-chip uses. Remarkably, miniaturizing the devices to the microscale results in enhanced charge-storage capacity and rate capability. These microsupercapacitors demonstrate a power density of ~200 W cm-3, which is among the highest values achieved for any supercapacitor.
Preparation of Graphitic Oxide
William S. Hummers & Richard E. Offema
- The conventional method for the preparation of graphitic oxide is time consuming and hazardous. Hummers and Offema have developed a rapid, relatively safe method for preparing graphitic oxide from graphite in what is essentially an anhydrous mixture of sulfuric acid, sodium nitrate and potassium permanganate.
- Nina I. Kovtyukhova et al.
- For the synthesis of graphitic oxide, El-Kady and Kaner used a modified Hummers' method developed by Nina I. Kovtyukhova et al.
Finance