Using Miniature Thermoelectric Generators for Wearable Energy Harvesting

Vondrak, Jaroslav; Schmidt, Martin; Proto, Antonino; Jargus, Jan; Peter, Lukas

doi:10.23919/splitech.2019.8782997

Cited by 6 publications

(4 citation statements)

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“…[43] Therefore, the use of highly efficient and green reducing agents is needed for the production of rGO coated textiles. [44] Furthermore, different fabrication techniques including; vacuum filtration, [45] brush painting, [46] spin coating, [47] spray coating, [48] screen printing, [49] stencil printing, [50] dip coating, [51] heat transfer, [52] vapor deposition, [53] chemical vapor deposition (CVD) [54] and wet transfer are also reported in previous studies. [55] Among all these techniques, pad-dry cure method is highly efficient and suitable approach with a production speed of 150 m/min, which is suitable for mass production of graphene-coated textiles.…”

Section: Introductionmentioning

confidence: 99%

“…The second small sister sharp peaks is observed at 19.8°, this diffraction peak may attribute to crystal formation of PEDOT: PSS crystals and very small peak allocated at 25.6° represented for polymer (PEDOT: PSS) as shown in figure2 d). see supplementary information (ESI-S1 Figure.1)[49] The XRD diffraction analysis shows that, the oxidized GO has intensity peaks (2θ=9.5°) with crystal planes of (001). The peak was reduced to 2θ (9.5°), with d-spacing of 0.835nm, may observed due to the higher oxidation level of GO as compared to pure graphite as shown in figure.3 a) & b) respectively.…”

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confidence: 99%

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The fabrication of a graphene and conductive polymer nanocomposite-coated highly flexible and washable woven thermoelectric nanogenerator

et al. 2021

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

The fabrication of a graphene and conductive polymer nanocomposite-coated highly flexible and washable woven thermoelectric nanogenerator

et al. 2021

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“…The integrated thermistor probes are the NTC 10K3MBD1, having time response of 400 ms and resolution ±0.2 °C in the temperature range from 0 °C to +70 °C. The temperature measurement system used to monitor the value of ∆ meas is custom made and it has already been used by our research group in [33] - [35].…”

Section: B Thermal Measurementsmentioning

confidence: 99%

A Flexible Thermoelectric Generator Worn on the Leg to Harvest Body Heat Energy and to Recognize Motor Activities: A Preliminary Study

et al. 2021

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Wearable devices are commonly used to monitor human movement since motor activity is a fundamental element in all phases of a person's life. Patients with motor disorders need to be monitored for a prolonged period and the battery life can be a limit for such a goal. Here the technique of harvesting energy from body heat to supply energy to wearable devices is investigated. A commercial flexible thermoelectric generator, equipped with an accelerometer, is placed on the lower leg above the ankle. The accelerometer serves to detect diverse motor activities carried out by ten students of VSB-Technical University of Ostrava involved in the execution of two tasks. To summarize, the motor activities analyzed in the proposed work are: "Sit", "Walk", "Rest", "Go biking", "Rest after biking", and "Go down and up the stairs". The maximum measured value of power density was 20.3 µW cm -2 for the "Walk" activity, corresponding to a gradient of temperature between the hot and cold side of the thermocouples constituting the flexible thermoelectric generator of 1.5 °C, while the minimum measured value of power density was 8.3 µW cm -2 for the "Sit" activity, corresponding to a gradient of temperature of 1.1 °C. Moreover, a mathematical model was developed for the recognition of motor activities carried out during the execution of the experiments. As a preliminary result, it is possible to state that semi-stationary parts of the signal generated by the thermoelectric generator can be traced back to the performance of an activity.

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“…Different wearable products with TEGs that use body heat have been developed, for example, a pulse-oximeter [41], a body-powered electroencephalogram system [42] and a wireless electrocardiography system inserted into a shirt [43,44]. Flexible TE modules with miniature thermoelements integrated into a fabric or silicon matrix [45] are more suitable for power generation from the human body [46][47][48]. Since miniscale TEGs usually operate at near room temperature conditions, Bi 2 Te 3 -based materials are commonly used for such generators.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Efficiency for Miniscale Thermoelectric Converter under the Influence of Electrical and Thermal Resistance of Contacts

Vikhor

Kotsur

2023

Energies

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Mass-produced thermoelectric modules are mainly fabricated with Bi2Te3-based materials. Due to the limited world reserves and the high price of tellurium, it must be saved. The miniaturization of thermoelectric converters is one of the modern trends to diminish the use of tellurium, reduce the cost of modules and expand the range of their applications. The main disadvantage of miniature thermoelectric converters operating in cooling or generating modes is their low energy efficiency, caused by the effect of electrical and thermal resistances of contacts, interconnectors and insulating plates. We propose an improved method for evaluating the maximum efficiency that takes into consideration the impact of these unwanted resistances. This method can also be used to design the modules with the optimal structure for cooling and energy generation, and not only to study their performance. The effect of undesirable electrical and thermal resistances on the maximum efficiency of cooling and generating converters made of Bi2Te3-based materials is analyzed. It is shown that the efficiency of miniature modules can be significantly improved if these resistances are reduced to their rational values. The decrease in electrical contact resistance is the predominant factor. The rational values to which it is advisable to decrease the electrical contact resistance have been determined. In the development of miniscale module technology, it is necessary to focus on such rational contact resistance values.

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Using Miniature Thermoelectric Generators for Wearable Energy Harvesting

Cited by 6 publications

References 11 publications

The fabrication of a graphene and conductive polymer nanocomposite-coated highly flexible and washable woven thermoelectric nanogenerator

The fabrication of a graphene and conductive polymer nanocomposite-coated highly flexible and washable woven thermoelectric nanogenerator

A Flexible Thermoelectric Generator Worn on the Leg to Harvest Body Heat Energy and to Recognize Motor Activities: A Preliminary Study

Evaluation of Efficiency for Miniscale Thermoelectric Converter under the Influence of Electrical and Thermal Resistance of Contacts

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