Related Experiment Video
Updated: May 13, 2026
12:00
Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
Highly conductive VO2 treated with hydrogen for supercapacitors
Xuan Pan1, Yong Zhao, Guofeng Ren
1Department of Electrical and Computer Engineering and Nano Tech Center, Texas Tech University, Lubbock, Texas 79409, USA.
Chemical Communications (Cambridge, England)
|March 19, 2013
Summary
Hydrogen treatment significantly reduced vanadium dioxide (VO2) resistance for supercapacitors. This enhancement resulted in improved capacitance and energy density, showing four times greater stability than untreated materials.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Vanadium dioxide (VO2) exhibits thermochromic properties with potential for energy storage applications.
- Improving the electrical conductivity and stability of VO2 is crucial for effective supercapacitor performance.
Purpose of the Study:
- To investigate the effect of hydrogen (H2) treatment on VO2 resistance for supercapacitor applications.
- To evaluate the electrochemical performance and cycling stability of H2-treated VO2.
Main Methods:
- Hydrogen (H2) gas treatment was applied to VO2 materials.
- Supercapacitors were fabricated using treated and untreated VO2 samples.
- Electrochemical performance, including specific discharge capacitance and energy density, was measured at a rate of 1 A g(-1).
- Long-term cycling stability was assessed.
Main Results:
- H2 treatment reduced VO2 resistance by nearly three orders of magnitude.
- Specific discharge capacitance reached 300 F g(-1).
- Specific energy density was demonstrated at 17 W h kg(-1) at 1 A g(-1).
- Long-term cycling stability was four times higher compared to untreated samples.
Conclusions:
- H2 treatment is an effective method to enhance VO2 conductivity and performance in supercapacitors.
- The treated VO2 demonstrates superior electrochemical properties and durability for energy storage.
- This approach offers a promising pathway for developing advanced supercapacitor materials.
Related Concept Videos
02:47Voltaic/Galvanic Cells
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
03:12Batteries and Fuel Cells
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
01:18Capacitor With A Dielectric
Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
01:25MOS Capacitor
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
01:12Energy Stored in a Capacitor
When an archer pulls the string in a bow, he saves the work done in the form of elastic potential energy. When he releases the string, the potential energy is released as kinetic energy of the arrow. A capacitor works on the same principle in which the work done is saved as electric potential energy. The potential energy (UC) could be calculated by measuring the work done (W) to charge the capacitor.
01:10Energy Stored in Capacitors
A parallel plate capacitor, when connected to a battery, develops a potential difference across its plates. This potential difference is key to the operation of the capacitor, as it determines how much electrical energy the capacitor can store.
By integrating the equation that relates voltage and current in a capacitor, one can derive an equation for the voltage across the capacitor at any given time. This equation is crucial in understanding and predicting the behavior of capacitors in...
By integrating the equation that relates voltage and current in a capacitor, one can derive an equation for the voltage across the capacitor at any given time. This equation is crucial in understanding and predicting the behavior of capacitors in...