WPI-MANA Team Creates Thermoelectric Device Combined with Wavelength-selective Thermal Emitter ...

WPI-MANA

2020/11/16 15:00

TSUKUBA, Japan, Nov. 16, 2020 /Kyodo JBN/ --

International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS)

WPI-MANA Team Creates Thermoelectric Device Combined with Wavelength-selective Thermal Emitter That Generates Continuous Power, Day and Night

 

A team at WPI-MANA has created a thermoelectric device that can generate power continuously, 24 hours a day, without the problem of voltage dropping to zero when night falls and temperatures drop.

 

(Image: https://kyodonewsprwire.jp/prwfile/release/M105739/202011096797/_prw_PI1fl_q8Y4RCD3.jpg)

 

Thermoelectric devices have been attracting attention for energy harvesting, especially those that require independent power supply, such as outdoor sensors and monitors. Such devices, which are more ubiquitous than photovoltaics, only require temperature difference between its top and bottom to generate power.

 

However, thermoelectric devices placed outside experience reversal of voltage when temperatures change -- they flip the sign of their voltage, and the electrical current changes its direction of flow, so the voltage drops to zero and power generation ceases.

 

To address this problem, the MANA team built their device with a wavelength-selective emitter that continually radiates heat, so that its surface temperature is always cooler than the bottom side of the thermoelectric module, which is placed below the selective emitter.

 

The device consists of a 100-nanometer-thick aluminum film on the bottom of a glass substrate. Because the top of the device is cooler than the bottom, the temperature difference creates constant voltage all day and night.

 

The team found that using a selective emitter eliminates the problem of voltage dropping to zero during environmental changes in temperature.

 

As team leader Satoshi Ishii noted, “Cooling can be used to create a temperature difference compared to the ambient temperature, and because radiative cooling takes place day and night, thermoelectric generation is always possible.”

 

The larger the temperature difference, the larger the voltage. Using the heat on the underside of the device increases the temperature difference between the bottom and top, so heat from the mounting surface helps boost power output as well.

 

This research was carried out by Ishii (Principal Researcher, Photonics Nano-Engineering Group, WPI-MANA, NIMS) and his collaborators.

 

“Radiative cooling for continuous thermoelectric power generation in day and night”

Satoshi Ishii et al., Appl. Phys. Lett. (July 7, 2020);

DOI: 10.1063/5.0010190

 

MANA E-BULLETIN

https://www.nims.go.jp/mana/ebulletin/

 

MANA International Symposium 2021

https://www.nims.go.jp/mana/2021/

本プレスリリースは発表元が入力した原稿をそのまま掲載しております。また、プレスリリースへのお問い合わせは発表元に直接お願いいたします。

プレスリリース添付画像

| Small | Normal |
| Big | Original |

このプレスリリースには、報道機関向けの情報があります。

プレス会員登録を行うと、広報担当者の連絡先や、イベント・記者会見の情報など、報道機関だけに公開する情報が閲覧できるようになります。

プレスリリース受信に関するご案内

このプレスリリースを配信した企業・団体

  • 名称 国立研究開発法人物質・材料研究機構(NIMS) 国際ナノアーキテクト二クス研究拠点(WPI-MANA)
  • 所在地 茨城県
  • 業種 各種団体
  • URL https://www.nims.go.jp/mana/jp/
  • ※購読している企業の確認や削除はWebプッシュ通知設定画面で行なってください
  • SNSでも最新のプレスリリース情報をいち早く配信中