Bioinspired energy-free temperature gradient regulator for significant enhancement of thermoelectric conversion efficiency

• 成果类型: Article
• 署名作者: Tan, Haohan; Zhao, Yuqian; Jin, Peng; Xu, Xiang; Zhou, Xinchen; Marchesoni, Fabio; Huang, Jiping
• 署名单位: Fudan University; Fudan University; Harbin Institute of Technology; Shanghai Jiao Tong University; Tongji University; University of Camerino
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-10161
• DOI: 10.1073/pnas.2424421122
• 发表日期: 2025-02-18
• 关键词: performance; DESIGN

摘要

Enhancing thermoelectric conversion efficiency (TCE) is pivotal for advancing global energy conservation and emission reduction initiatives. Traditional approaches primarily focus on microscopic strategies such as bandgap engineering, chemical potential adjustments, and entropy engineering. However, these methods face substantial limitations in practical applications due to challenging material property requirements. Additionally, the efficiencies achieved remain modest, constrained by the interdependent nature of electrical and thermal conductivities, which typically vary concurrently. Inspired by the thermoregulation mechanisms in biological organisms, we propose here a macroscopic strategy based on an expanded-plane (EP) meta- structure. Such a meta-structure, of the thermal gradient regulator type, exploits the temperature gradient concentrating effect to significantly boost TCE. We prove, both numerically and experimentally, how the proposed device can achieve temperature gradient concentration under diverse conditions. Remarkably, under undistorted temperature background conditions, we measured an striking efficiency enhancement of 59.0%. This work highlights the EP thermal gradient regulator's ability to boost thermoelectric efficiency, valuable across domains: aiding efficient chip cooling in microelectronics and powering wearable medical devices.