If you would like to generate electricity from heat in a simple way that has no moving parts, this usually involves thermocouples. Thermocouples take advantage of an electrical effect that occurs at junctions between different metals. For example, take two iron wires and one copper wire. Twist one end of the copper wire and one end of one of the iron wires together.
Do the same with the other end of the copper wire and the other iron wire. If you heat one of the twisted junctions perhaps with a match and attach the two free ends to a volt meter, you will be able to measure a voltage. The team is now working to increase the efficiency of its generator design in two ways. First, it is building high-performance converters from existing semiconductor technologies. Second, it is optimizing its electrodes through the use of new materials, especially oxides, and nanotechnology.
The work is described in the Journal of Renewable and Sustainable Energy. Close search menu Submit search Type to search. Topics Astronomy and space Atomic and molecular Biophysics and bioengineering Condensed matter Culture, history and society Environment and energy Instrumentation and measurement Materials Mathematics and computation Medical physics Optics and photonics Particle and nuclear Quantum.
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Enter e-mail address This e-mail address will be used to create your account. Reset your password. Please enter the e-mail address you used to register to reset your password Enter e-mail address. However, when a thin layer of the material is applied to silicon, something amazing happens: the structure changes radically. Although the atoms still form a cubic pattern, they are now arranged in a space-centered structure, and the distribution of the different types of atoms becomes completely random.
This mixture of regularity and irregularity of the atomic arrangement also changes the electronic structure, which determines how electrons move in the solid. The portions of charge traveling through the material are referred to as Weyl Fermions," says Ernst Bauer. In this way, a very low electrical resistance is achieved. Lattice vibrations, on the other hand, which transport heat from places of high temperature to places of low temperature, are inhibited by the irregularities in the crystal structure.
Therefore, thermal conductivity decreases. This is important if electrical energy is to be generated permanently from a temperature difference—because if temperature differences could equilibrate very quickly and the entire material would soon have the same temperature everywhere, the thermoelectric effect would come to a standstill.
This is particularly promising for future production plants, where one machine has to react dynamically to another. It's much smarter for the sensors to be able to generate their own power using a small thermoelectric device," says Bauer.
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