Advances in the design and assembly of flexible thermoelectric device

Ultra-high electrical conductivity in filler-free polymeric hydrogels toward thermoelectrics and electromagnetic interference shielding.

By the increase of population and development of technology in recent years, energy demand has also increased. Due to the limitedness of energy resources, new research works and inventions are needed to ensure the continuity and efficient consumption of these sources and addressing economic problems. It is important to provide low-cost energy in living, industrial and commercial spaces with zero emission. Solar energy is an unlimited, clean and abundant energy source. However, the conditions of taking full advantage of sun vary seasonally. With the storage and conversion of solar energy, the sun, which is abundant in the summer period, can be used in the winter period. In this case, energy storage and conversion performance is extremely important to obtain the highest rate and efficiency from solar energy. The application and development of nanomaterials are popular issues in all fields, especially in energy storage and conversion applications, and play key roles in storage efficiency. Furthermore, phase change materials (PCMs) have successful and potential applications in the storage and conversion of solar thermal energy. In this study, research on efficient nanomaterials used in solar energy storage and conversion has been reviewed and discussed. According to the reviewed studies, efficiency was increased with the use of nanomaterials in solar energy storage and conversion systems. Particular attention was paid to the high charge and discharge rates of graphene and graphite-containing nanomaterials, as well as nanoparticles and composite materials added to PCMs. In addition, it has been stated that thermal energy is stored efficiently by the application of PEG support to composite materials. According to previous studies, the size, concentration, shape, and phase change of materials had critical effects on the storage efficiency of composite materials. • We reviewed the storage performance of efficient nanomaterials for STES systems. • Studies in sensible, latent and thermochemical methods for STES systems are summarized in detail. • Graphene and graphite-based nanomaterials were found to increase charge/discharge rates. • Nanocomposite materials have been found to provide efficiency in long-term storage. • Solar energy systems with nanoparticles added to base salts have promising performance. 

A novel review on the efficiency of nanomaterials for solar energy storage systems

Electromagnetic absorbers with Schottky contacts derived from interfacial ligand exchanging metal-organic frameworks.

https://repository.kaust.edu.sa/bitstream/10754/680534/1/1-s2.0-S2352940722002487-main.pdf

Flexible solar and thermal energy conversion devices: Organic photovoltaics (OPVs), organic thermoelectric generators (OTEGs) and hybrid PV-TEG systems

Finding a stable n-type flexible thermoelectric (TE) material with a high power factor and mass production is a challenge for wearable TE devices. In this paper, we report that metallic multiwalled carbon nanotubes (MWCNTs) and their hybrids are converted from p-type to n-type with an n-type dopant, 1,3-dimethyl-2-phenyl-2,3-dihydro-1h-benzoimidazole (NDMBI), with a high n-type Seebeck coefficient. The maximum power factor of the n-type hybrid is 195 μW m−1 K2 at 373 K which is 2–3 orders higher than those of most n-type MWCNT based organic materials in the literature. This high TE performance may be attributed to the high n-type Seebeck coefficient of MWCNTs derived from the effective n-type doping. The theoretical calculation results indicate that the effective n-type doping could increase the Seebeck coefficients of metallic MWCNTs without sacrificing their electrical conductivities when their Fermi level shifts to approach the one-dimensional van Hove singularity. The results suggest that the trade-off relationship between the electrical conductivity and the Seebeck coefficient of one-dimensional metallic materials could be solved, which are promising candidates for preparing large scalable, low-cost, and high-performance flexible TE devices for wearable electronics. This may promote the evolution of developing high performance organic and inorganic TE materials with metallic one-dimensional nanomaterials.

Mass-produced metallic multiwalled carbon nanotube hybrids exhibiting high N-type thermoelectric performances

Making organic devices with a single material is very challenging although single material devices have been considered as the next generation device for organic electronics. Here we report an effective approach to improve the thermoelectric (TE) performance of p- and n-type metal–organic framework (MOF) based hybrids. The polarity of the mixed-carrier hybrids was demonstrated to be determined by the component with a higher carrier concentration. A selective increase in the three key TE parameters was observed, leading to a dramatic enhancement in ZT. The maximum ZT value was boosted up to ∼270 times compared with the ZT of a pristine MOF , which is over 7 times higher than the previously reported ZT record for MOFs. Charge transport mechanism analysis reveals that a parallel transport model fits well with the change of the three TE parameters as a function of the CNT fillers. An all-MOF device was fabricated to show the energy conversion performance of this single-material TE device. Selective improvement in electrical properties and restraint in thermal conductivity present an efficient approach of developing MOF based TE materials. The study of the mixed carrier in a hybrid may lay a foundation for developing single-material organic electronics for various applications such as single material solar cells.

Enhanced electrical properties and restrained thermal transport in p- and n-type thermoelectric metal–organic framework hybrids

Enhanced thermoelectric performance and tunable polarity in 2D Cu2S-phenol superlattices composites for solar energy conversion

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Mass-produced metallic multiwalled carbon nanotube hybrids exhibiting high N-type thermoelectric performances

Enhanced electrical properties and restrained thermal transport in p- and n-type thermoelectric metal–organic framework hybrids

Enhanced thermoelectric performance and tunable polarity in 2D Cu2S-phenol superlattices composites for solar energy conversion