Defect-engineered reduced graphene oxide sheets with high electric conductivity and controlled thermal conductivity for soft and flexible wearable thermoelectric generators

Zeng, Wei1; Tao, Xiao-Ming1; Lin, Shuping1; Lee, Ching1; Shi, Dongliang2; Lam, Kwok-ho2; Huang, Baoling3; Wang, Qiaoming4; Zhao, Yue4

2018-12

10.1016/j.nanoen.2018.10.015

Nano Energy   影响因子和分区

2211-2855

2211-3282

The direct use of graphene for potential thermoelectric material requires the opening of its bandgap without loss of its high electric conductivity. We herein demonstrate a synchronous reduction and assembly strategy to fabricate large-area reduced graphene oxide films with high electric conductivity and optimized low thermal conductivity assembly. The reduced graphene oxide films have a high electric conductivity and low thermal conductivity, which results from high longitudinal carrier mobility of the lattice domains as well as the enhanced scattering of phonons in the defects and their boundary that substantially reduces the mean phonon free path and the thermal conductivity. Flexible thermoelectric generators were prepared by assembling reduced graphene oxide film on 3D printed polydimethylsiloxane grids, demonstrating a remarkable output voltage of 57.33 mV/g at a temperature difference of 50 K. A wristband-type flexible thermoelectric generator with 7 repeating units generated a maximum power density of 4.19 mu W/g at ambient temperature of 15 degrees C. The 3D printed generator is promising in providing power autonomy to wearable microwatt electronic devices. In addition, we believe that this work can be easily scaled up and can offer the pathway to produce large-scale manufacturing of graphene based materials for future microelectronics and large-scaled flexible and wearable energy harvesting systems.

Thermoelectric generator Graphene Wearable Energy harvesting Solution process

SCI ; EI

英语

其他

Hong Kong Polytechnic University[1-BBA3]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied

WOS:000450974700019

ELSEVIER

20184205963615

3D printers ; Defects ; Electric conductivity ; Electric conductivity measurement ; Electric losses ; Electric machine control ; Energy harvesting ; Graphene ; Microelectronics ; Phonons ; Silicones ; Thermal conductivity of solids ; Thermoelectric equipment ; Wearable technology

Energy Conversion Issues:525.5 ; Thermoelectric Energy:615.4 ; Thermodynamics:641.1 ; Electricity: Basic Concepts and Phenomena:701.1 ; Control System Applications:731.2 ; Printing Equipment:745.1.1 ; Nanotechnology:761 ; Chemical Products Generally:804 ; Organic Polymers:815.1.1 ; Electric Variables Measurements:942.2 ; Materials Science:951

Web of Science

1.Hong Kong Polytech Univ, Inst Text & Clothing, Res Ctr Smart Wearable Syst, Hong Kong, Hong Kong, Peoples R China
2.Hong Kong Polytech Univ, Dept Elect Engn, Hong Kong, Hong Kong, Peoples R China
3.Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Hong Kong, Hong Kong, Peoples R China
4.Southern Univ Sci & Technol China, Dept Phys, Shenzhen, Peoples R China

Zeng, Wei,Tao, Xiao-Ming,Lin, Shuping,et al. Defect-engineered reduced graphene oxide sheets with high electric conductivity and controlled thermal conductivity for soft and flexible wearable thermoelectric generators[J]. Nano Energy,2018,54:163-174.

Zeng, Wei.,Tao, Xiao-Ming.,Lin, Shuping.,Lee, Ching.,Shi, Dongliang.,...&Zhao, Yue.(2018).Defect-engineered reduced graphene oxide sheets with high electric conductivity and controlled thermal conductivity for soft and flexible wearable thermoelectric generators.Nano Energy,54,163-174.

Zeng, Wei,et al."Defect-engineered reduced graphene oxide sheets with high electric conductivity and controlled thermal conductivity for soft and flexible wearable thermoelectric generators".Nano Energy 54(2018):163-174.