Related Experiment Video
Updated: Oct 16, 2025
09:09
Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
Published on: February 5, 2020
7.1K
An Axially Continuous Graphene-Copper Wire for High-Power Transmission: Thermoelectrical Characterization and
Hamzeh Kashani1, Chunghwan Kim1, Christopher Rudolf2
1Department of Aerospace and Mechanical Engineering, School for the Engineering of Matter, Transport, and Energy, Arizona State University, Tempe, AZ, 85281, USA.
Advanced Materials (Deerfield Beach, Fla.)
|October 22, 2021
Summary
Graphene-coated copper wires show a 450% increase in current density limits, improving heat dissipation and conductivity for high-power applications like electric vehicles and drones.
Area of Science:
- Materials Science
- Electrical Engineering
- Nanotechnology
Background:
- Increasing demand for high-power electrical transmission driven by advancements in electric vehicles, drones, and military technology.
- Need for materials with superior electrical properties to meet these demands.
Purpose of the Study:
- To demonstrate enhanced electrical properties in microscale wires by synthesizing axially continuous graphene layers.
- To investigate the mechanisms behind these enhancements in graphene-copper (ACGC) wires compared to pure copper wires.
Main Methods:
- Synthesis of axially continuous graphene layers on microscale-diameter wires.
- Characterization of electrical properties (current density, conductivity, thermal stability) of ACGC and pure copper wires.
- Controlled experiments varying ambient temperature, gases, and pressure.
- High-speed camera imaging to observe failure behavior.
Main Results:
- Achieved a 450% increase in the current density breakdown limit in ACGC wires.
- Demonstrated a 224% improvement in surface heat dissipation and a 41% increase in electrical conductivity.
- Observed significantly enhanced thermal stability, with 41.2% lower resistivity after thermal cycling up to 450°C.
- ACGC wires exhibited distinct failure mechanisms near the current density limit compared to pure copper.
Conclusions:
- Axially continuous graphene layers significantly enhance the electrical properties of copper wires.
- The improvements are attributed to enhanced heat dissipation, electrical conductivity, and thermal stability.
- ACGC wires offer a promising solution for high-power electrical transmission applications.
Related Concept Videos
01:31Energy Stored In A Coaxial Cable
1.7K
A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic...
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic...
1.7K
01:23Transmission Line Design Considerations
237
Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
237
01:22Magnetic Force On Current-Carrying Wires: Example
1.7K
In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
1.7K
01:28Types Of Superconductors
1.2K
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
1.2K
01:28Magnetic Field Due To A Thin Straight Wire
5.1K
Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
5.1K
01:17Theory of Metallic Conduction
1.5K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
1.5K