Xiangqian Jiang,Chuncheng Ban,Ling Li,Han Li,Jiandong Hao,Weiping Chen,Xiaowei Liu
The Seebeck coefficient, electrical conductivity and thermal conductivity of thermoelectric materials are related but not independent, so it is difficult to improve the figure of merit value of thermoelectric materials. In the compound with nanometer grain size, a large number of surface interfaces and various defects in the material will increase the phonon scattering, resulting in the decrease of lattice thermal conductivity. Therefore, the nano-structure of the material is expected to increase its thermoelectric performance parameters. This work presents is based on the self-synthesized BN nano-materials, different structure of the thermoelectric cell composed of nanomaterial BN and thermoelectric material bismuth telluride are designed and analyzed, and its output voltage and power are simulated. Low dimensional BN nanomaterials with low thermal conductivity may contribute to reduce the overall thermal conductivity of the battery and improve the output efficiency. The thermoelectric coefficient of the thermoelectric battery is approximately calculated to be 1.22, which will satisfy the power supply requirements of some small power electronic equipment in practical application.
Xuan Zhao,Chuanshan Zhao,Yifei Jiang,Xingxiang Ji,Fangong Kong,Tong Lin,Hao Shao,Wenjia Han
Cellulose nanofiber (CNF) is obtained from cellulose resources (e.g., natural cellulose, bacterial cellulose, etc.) and is considered to be a low-cost, green and inexhaustible material. The impressive optical, mechanical, and thermal properties of this material have aroused great interest in fabricating of flexible electronic devices based on CNF. Hereby, the CNF/Bi 2 Te 3 thermoelectric composite films are fabricated using a facile vacuum filtration method. Subsequently, n-type and p-type films composed of this composite materials are used as legs to assemble thermoelectric generator (TEG) prototype. Besides, these composite films exhibit excellent mechanical flexibility and the electrical conductivity of the CNF/Bi 2 Te 3 film only decreases by 8% after 1000 bending cycles. And the contact angle of the polytetrafluoroethylene (PTFE) solution and alkylketene dimmer (AKD) emulsion co-treated film is as high as 150.7°, which has superhydrophobic properties. The TEG prototype consists of five p-n legs. At a temperature gradient of 60 K, the output voltage of the TEG prototype is 22.34 mV and the output power is 561 nW. This work not only proves the great potential of CNF application in flexible thermoelectric (TE) materials, but also promotes robust development of cellulose-based electronics.
危险品化学品经营许可证（带存储）