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Nanoporous carbon electrodes and supercapacitors formed therefrom

A capacitor and electrode technology, applied in the field of electrochemical double layer capacitors

Inactive Publication Date: 2011-08-17
THE UNIV OF QUEENSLAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

An important challenge is to develop low-cost activated carbon electrodes with high energy and power densities

Method used

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  • Nanoporous carbon electrodes and supercapacitors formed therefrom
  • Nanoporous carbon electrodes and supercapacitors formed therefrom
  • Nanoporous carbon electrodes and supercapacitors formed therefrom

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Embodiment Construction

[0034] The following embodiments are only for illustration, and are used for a more accurate understanding of the preferred embodiments of the present invention.

[0035] Coffee grounds

[0036] see figure 1, an exemplary method 100 for preparing activated carbon is shown. Coffee grounds, preferably spent coffee grounds, are obtained in step 110, for example as a by-product obtained from the general step of preparing coffee drinks from ground coffee beans. In step 120, the spent coffee grounds are reacted with an activator in an environment comprising at least one inert gas, for example in a nitrogen reaction atmosphere. As an exemplary embodiment, the activator may be zinc chloride, and the reaction is performed at a temperature higher than 873K. More preferably, the temperature is about 1100-1200K. Optionally, in step 130, the method 100 further includes the following subsequent steps: washing the waste coffee grounds with hydrochloric acid, and then rinsing with disti...

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Abstract

The invention provides a method of producing activated carbon by reacting waste coffee grounds with an activating agent in an environment including at least one inert gas. Also disclosed is a nanoporous carbon electrode for use in a supercapacitor, and an Electrochemical Double-Layer Capacitor (EDLC). The constructed supercapacitor, in 1 M H2SO4 aqueous electrolyte, exhibited energy densities up to 20 Wh / kg, and excellent stability at high charge-discharge rates. In a two electrode cell the electrode was observed to have a specific capacitance as high as 368 F / g, rectangular cyclic voltammetry curves and stable performance over 10,000 cycles. Also disclosed is an EDLC using an organic electrolyte, the influence of activation agents and ratios, and activated carbon prepared from sugar cane bagasse.

Description

technical field [0001] One form of the invention relates generally to electrochemical double layer capacitors (EDLCs), also known as supercapacitors and ultracapacitors, and more particularly to EDLCs comprising nanoporous carbon electrodes formed from activated carbon. In other forms, the present invention also generally relates to methods for forming nanoporous carbon electrodes from carbon precursors, and / or to methods for activating carbon. Background technique [0002] Electrochemical double layer capacitors (EDLCs), also known as supercapacitors and ultracapacitors, can be used in many applications, especially in energy homogenization and transient loading devices. For example, EDLCs are reliable battery replacements for delivering peak power demands in portable electronic applications. Energy storage in EDLCs relies on charge accumulation at the electrodes purely through electrostatic forces, unlike batteries, in that they do not involve chemical reactions, thus enab...

Claims

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Application Information

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IPC IPC(8): H01G9/058B01J20/22H01G9/155H01G11/24H01G11/26H01G11/34
CPCH01G11/34Y02E60/13B01J20/28083H01G11/24H01G9/058B01J20/20H01G9/155H01G11/26
Inventor T・E・拉福德D・尤尔查科娃Z・朱G・Q・陆
Owner THE UNIV OF QUEENSLAND
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