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Professor Shinichi Murakami of the Department of Fiber Science at Shinshu University who is a public power generation component. On the left is Miyazawa Shinzo, NTS representative director.
Professor Murakami of the Department of Fiber Science at Shinshu University in Japan and Japan’s NTS Corporation announced on June 18, 2014 that they have developed a power generation element that can obtain 1.5V and several mA of power at a temperature of 100°C. In the Department of Fiber Science at Shinshu University, we also made a practical demonstration of lighting the LED lamp.
Although the principle of power generation is still unclear, Murakami stated that "this is a new type of power generation unlike chemical batteries and semiconductor batteries." At the same time, it also stated that "In order to make rapid progress in practicality and principles, we have deliberately done so. Published." There is currently a thermoelectric conversion element that uses the Seebeck effect in the power generation element that uses heat, but the element that was developed this time can generate power even without a temperature difference. Therefore, Murakami points out that this is not a power generation element that uses the Seebeck effect.
Trial battery unit. A cylindrical battery cell was also prototyped.
This time, the power generating element has a simple structure, and a zinc compound is mixed as an active material, a dielectric compound, and a conductive polymer in an optimal ratio between the aluminum alloy electrode and the copper alloy electrode. This time, a 1-cm-square battery cell was prototyped with about 1 g of active material, and a demonstration of lighting the LED was made. In the specific demonstration, three red LEDs were lit by heating the battery unit with a blower, and a blue LED was also lit.
When three red LEDs are lighted, the LED immediately lights up when the wind power of the blower is encountered. When the temperature of the battery cell rises to approximately 100° C., approximately 0.88 mW having a voltage of approximately 1.56 V and a current of approximately 0.57 mA is obtained. Power output value.
The development opportunity stems from the fact that NTS “observed voltage and weak current values ​​in materials that were accidentally operated†three and a half years ago (NTS representative director Miyazawa Shimo). The company specializes in the sale of special titanium oxide powder materials, and specializes in the doping of materials.
Demonstration of lighting a blue LED
Type of power generation yet to be determined
This time, the component was considered as a new type of power generation component, but at the same time there were many questions. Therefore, the author tried to put forward several questions. The first problem is that the element structure itself is similar to the capacitor and whether the battery is still counted. In response, the developer responded that "there is indeed a capacitor, but it does not show an oxidation-reduction reaction, so it cannot be considered a chemical battery."
Another problem is whether it belongs to a thermoelectric conversion device that utilizes the Seebeck effect. In response, the developer stated that because it can produce electricity with almost no temperature difference, it is not a Seebeck effect power generation component.
Recently, research on thermophotovoltaic (TPV) power generation has become more active. As for the possibility of such power generation, the developer stated that although TPV power generation performs photoelectric conversion as in the case of solar cells after filtering solid-radiation light, this element has a simple structure and cannot achieve the same mechanism as thermo-photovoltaic power generation.
Lower temperatures can also generate electricity
As for the use of this power generation element, Shinshu University and NTS believe that because it does not use the temperature difference to generate electricity and the constituent materials are inexpensive, it can be used in a wide range of fields. For example, the solar cell temperature rises to 60 to 80°C during the summer, which results in a drop in power generation efficiency. Therefore, the installation of this new type of power generation element on the back of the module will help improve the power generation efficiency. In addition, it can also be used for power generation using hot springs and waste heat, as well as in-vehicle dashboards that reach a temperature of approximately 80°C in summer.
In the future, if the power generation start temperature can be reduced to near the human body temperature, electricity can also be generated by clothes or bedding. (Reporter: Hiroshi Koshihiko, Nikkei Technology)
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