A flexible, printable, thin-film thermoelectric generator based on reduced graphene oxide–carbon nanotubes composites

Mehmood, Tariq; Kim, Jin Ho; Lee, Do-Joong; Dizhur, S. E.; Hirst, Elizabeth S.; Osgood, R. M.; Sayyad, Muhammad Hassan; Munawar, Munawar Ali; Xu, Jimmy

doi:10.1007/s10853-020-04750-z

Cited by 12 publications

(12 citation statements)

References 32 publications

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“…The Seebeck coefficients at different temperatures are calculated in Figure d, where the Seebeck coefficient under illumination is nearly −75 ± 3 μV/K, which is about 3 times that (−25 μV/K) under dark, which is due to the high photon-generated carrier concentration and large electron conductivity upon light illumination. Here, the negative “–” means that the CdSSe material is an n-type semiconductor, which is consistent with the reported result. , However, unlike that the Seebeck coefficient increases with rising the temperature of other materials reported in the literature, ,, herein the Seebeck coefficient does not vary obviously with the increase in temperature of a chip. The thermoelectric effect has been proved to exist in such a kind of nanowire chip; meanwhile, the photo-thermoelectric performance of the CdSSe device is also realized in this chip.…”

Section: Resultssupporting

confidence: 90%

“…Here, the negative "−" means that the CdSSe material is an n-type semiconductor, which is consistent with the reported result. 29,35 However, unlike that the Seebeck coefficient increases with rising the temperature of other materials reported in the literature, 17,36,37 herein the Seebeck coefficient does not vary obviously with the increase in temperature of a chip. The thermoelectric effect has been proved to exist in such a kind of nanowire chip; meanwhile, the photo-thermoelectric performance of the CdSSe device is also realized in this chip.…”

Section: ■ Results and Discussionmentioning

confidence: 57%

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New Type of Thermoelectric CdSSe Nanowire Chip

Ding

Wazir

et al. 2021

ACS Appl. Mater. Interfaces

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Facing the increasingly serious problem of environmental pollution and energy waste, the thermoelectric generator has been attracting more and more attention owing to its advantages including low cost, no pollution, and good stability. The family of thermoelectric material is constantly extended with enhanced performance. Note that nanostructuring can enhance thermoelectric performance. However, the most recent excellent material with effective thermoelectric transformation reported from bulk materials has definite benefits to the practical application compared to nanomaterials. In this work, a nanostructure integrated macroscale thermoelectric chip, that is an alloyed band gap gradient macroscale chip (1.0 cm × 2.0 cm) composed of CdSSe nanowires, has been proven as an excellent thermoelectric generator for the first time. A high Seebeck coefficient of −152.4 μV/K and the average output voltage of 10.8 mV are obtained after optimizing the electrode patterns and distance between electrodes. More interestingly, upon illumination by white light from a xenon lamp, a photo-thermoelectric output voltage is greatly elevated to 45 mV due to the high concentration of photogenerated carriers. The CdSSe thermoelectric chip also shows good repeatability and high stability with a relative error of <6%. No study on the thermoelectric performance of such an alloyed band gap gradient macroscale chip is mentioned before. The results illustrate a bright avenue to realize a type of light-modulated macroscale thermoelectric chips by nanostructure, allowing such kinds of CdSSe chips to be used to generate electric energy in the near future.

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Section: Resultssupporting

confidence: 90%

Section: ■ Results and Discussionmentioning

confidence: 57%

New Type of Thermoelectric CdSSe Nanowire Chip

Ding

Wazir

et al. 2021

ACS Appl. Mater. Interfaces

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“…Thermoelectric (TE) generators that can convert heat to electricity are emerging as an alternative, because thermal energy is very abundant and can be supplied from various sources including sunlight and the human body. However, hundreds (or more) of typical TE systems need to be connected in series to produce a sufficient voltage for practical use, due to the low Seebeck coefficient of electronic conductors. − Very recently, a few attempts have been made to exploit the ionic conductors including ion gels. − For example, a very high Seebeck coefficient of 26.1 mV·K –1 and a dimensionless figure of merit (ZT) value of 0.75 were obtained at room temperature, when ion gels based on PVDF- co -HFP were employed as the ionic conductor . As a result, the TE device could efficiently harvest heat even in a low temperature range.…”

Section: Versatile Applicability Of Ion Gels In Electrochemical Elect...mentioning

confidence: 99%

Functional Ion Gels: Versatile Electrolyte Platforms for Electrochemical Applications

et al. 2021

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Ion gels consisting of room-temperature ionic liquids and polymer gelators are considered attractive solid-state electrolyte platforms for functional electrochemical applications due to their tunable electrochemical/mechanical properties, nonvolatility even in a vacuum, and compatibility with various solution processes. Accordingly, a number of studies have been reported on improving the functionality of ion gels and their use in diverse applications. In this Perspective, we highlight recent representative advances in the development of functional gels based on judiciously designed copolymer gelators or prepared by incorporating redox species. In addition, we introduce versatile applicability of ion gels in a variety of applications including electrochemical displays, smart sensory systems, and energy generation/storage systems.

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“…[191][192][193][207][208][209][210][211] Yet, such materials have lower performance relative to conventional rigid TEGs. [209,210,212] The performance could be improved by lowering the electrical resistivity or increasing the Seebeck coefficient of this class of thermoelectric materials.…”

Section: Solution-processes and Organic Materialsmentioning

confidence: 99%

Energy Harvesting and Storage with Soft and Stretchable Materials

et al. 2021

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Soft robotics can interact with humans safely. 3) Devices built from stretchable materials have a greater mechanical degree of freedom. This allows electronics, displays, and sensors to be integrated into places that would be difficult or impossible with rigid devices and enables new types of human-computer interfaces. It also allows robotics to have enhanced levels of dexterity and complexity in movement (consider the octopus as an inspiring example). 4) Devices that can be deformed elastically can be engineered to have new or emerging properties, such as antennas that change frequency with elongation, [21] intelligent materials that can perform unconventional forms of logic, [22,23] or composites that change thermal conductivity, [24] electrical conductivity, [25] or dielectric properties with deformation. [26][27][28] Most robotic and electronic devices require electricity to function, as shown on the left side of Figure 1A. Electricity can power sensors, enable computation, drive locomotion, and transmit information. Although most devices use electricity from an outlet, such "tethered" devices create notable limitations. In addition to limiting the degree of freedom of robotic materials, plug-in devices must be within a chords-length of a functioning outlet, thereby confining the range of use of such devices. Although battery operated devices can operate for some time without being plugged-in, the need to do so periodically is at best a nuisance that limits the operating time of a device. At worst, it can lead to issues such as lack of compliance with wearable devices (that is, the device is taken off for charging and never put back on) or disruptions in operation (a particular problem for health care devices or remotely deployed devices). Thus, there is a compelling interest in harvesting energy from the ambient to create tetherless devices or even devices that need less charging. Figure 1A (right side) provides examples of applications that may benefit from harvesting, such as internetof-things (IOT) devices, soft robots, wearables, implantables, and deployables (that is, devices sent to remote locations that do not have electrical outlets). Energy Harvesting CategoriesStrategies to harness energy typically convert waste or otherwise unused energy from the ambient into electricity. Although This review highlights various modes of converting ambient sources of energy into electricity using soft and stretchable materials. These mechanical properties are useful for emerging classes of stretchable electronics, e-skins, bio-integrated wearables, and soft robotics. The ability to harness energy from the environment allows these types of devices to be tetherless, thereby leading to a greater range of motion (in the case of robotics), better compliance (in the case of wearables and e-skins), and increased application space (in the case of electronics). A variety of energy sources are available including mechanical (vibrations, human motion, wind/fluid motion), electromagnetic (radio frequency (RF), solar), and ther...

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A flexible, printable, thin-film thermoelectric generator based on reduced graphene oxide–carbon nanotubes composites

Cited by 12 publications

References 32 publications

New Type of Thermoelectric CdSSe Nanowire Chip

New Type of Thermoelectric CdSSe Nanowire Chip

Functional Ion Gels: Versatile Electrolyte Platforms for Electrochemical Applications

Energy Harvesting and Storage with Soft and Stretchable Materials

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