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Optimal array alignment to deliver high performance in flexible conducting polymer-based thermoelectric devices

Journal of Materials Science & Technology 2022年第29期124卷 252-259页

作者： Shengduo Xu Meng Li Min Hong Lei Yang Qiang Sun Shuai Sun Wanyu Lyu Matthew Dargusch Jin Zou Zhi-Gang Chen School of Mechanical and Mining Engineering The University of QueenslandBrisbaneQueensland4072Australia Centre for Future Materials University of Southern QueenslandSpringfield CentralQueensland4300Australia School of Materials Science&Engineering Sichuan UniversityChengdu 610064China Centre for Microscopy and Microanalysis The University of QueenslandBrisbaneQueensland4072Australia School of Chemistry and Physics Queensland University of TechnologyBrisbaneQueensland4000Australia

flexible thermoelectric devices(F-TEDs)show great potentials to be applied in curved surface for power generation by harvesting low-grade energy from human body and other heat sources.However,their power generation efficiency is constrained by both unsatisfactory constituent materials performance and immature device design.Here,we used an optimal alignment of vertically-aligned poly(3,4-ethylenedioxythiophene)polystyrene sulfonate(PEDOT:PSS)arrays to assemble a 2.7×3.2 cm^(2)F-TEDs,exhibiting a maximum power output of 10.5μW.Such a high performance can be ascribed to the outstanding power factor of 198μW m^(-1)K^(-2)by the synergetic effect of both high charge mobility and optimal oxidation level and the optimized array alignment that maximizes the temperature difference utilization ratio across the TE legs.Particularly,optimized leg distance of 6 mm and leg length of 12 mm are determined to realize a high temperature difference utilization ratio of over 95%and a record-high output power density of 1.21μW cm^(-2)under a temperature difference of 30 K.Further,reliable bending(1000 cycles)and stability(240 h)tests indicate the outstanding mechanical robustness and environmental stability of the developed F-TEDs.This study indicates our reasonable device design concept and facile material treatment techniques secure high-performance F-TEDs,serving as a reference for other flexible energy harvesting devices with wide practical applications.

关键词： flexible thermoelectric device Performance optimization TE array alignment Optimized power density

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A flexible and smart shape memory alloy composite sheet based on efficient and bidirectional thermal management

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International Journal of Smart and Nano Materials 2022年第2期13卷 315-329页

作者： Yang Yang Yongquan Wang Tao Yao Xiaojuan Feng School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an People’s Republic of China Shanghai Marine Diesel Engine Research Institute Shanghai People’s Republic of China

Leveraging advances in shape memory alloys(SMAs)and flexible thermoelectric devices(f-TEDs),this paper presents a structural and functional integrity composite sheet to address the inefficient and bulky activation of 2-D SMAs.A series of experimental tests were performed to reveal the generation,change,and transfer mechan-isms of different types of electrically-induced heat in the f-TED,as well as the temperature-induced SMA phase transformation beha-viors.The results show that the composite sheet exhibited good bidirectional thermal management capacity.The austenite defor-mation can be completed within 10s at an operating current of 2 A.The cooling recovery,in particular,performs much better than in conventional modes(the temperature declines exponentially with time).Finally,through two functional prototypes,a light switch and a flexible gripper,the application potential of the proposed com-posite was further experimentally demonstrated.

关键词： Shape memory alloy flexible thermoelectric device bidirectional thermal management actuator thermomechanical

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