Mixed Ionic–Electronic Conducting Hydrogels with Carboxylated Carbon Nanotubes for High Performance Wearable Thermoelectric Harvesters

Lee, Chia-Yu; Lin, Yen-Ting; Hong, Shao-Huan; Wang, Chia-Hsin; Jeng, U-Ser; Tung, Shih-Huang; Liu, Cheng-Liang

doi:10.1021/acsami.3c09934

Cited by 9 publications

(1 citation statement)

References 78 publications

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“…In comparison to natural wood, the proportion of intrachain hydrogen bonds and free OH was significantly lower in in situ fibrillated wood, while the proportion of interchain hydrogen bonds was remarkably higher. Reactive DES treatment induced a blue shift of the peaks assigned to hydrogen bonds, presumably due to the carboxylation of wood components. − These results suggested the deconstruction and follow-up reconstruction of the hydrogen bonding networks within the lignocellulose matrix during the in situ fibrillation process. XPS spectra in Figure e showed that in situ fibrillated wood possessed a higher O/C ratio (0.57 vs 0.25) in comparison to natural wood, presumably due to the partial removal of lignin by reactive DES treatment.…”

Section: Resultsmentioning

confidence: 90%

Versatile Mesoporous All-Wood Sponge Enabled by In Situ Fibrillation toward Indoor–Outdoor Energy Management and Conversion

Meng,

Liu,

Zhou

et al. 2024

ACS Appl. Mater. Interfaces

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The on-demand regulation of cell wall microstructures is crucial for developing wood as a functional building material for energy management and conversion. Here, a novel strategy based on reactive deep eutectic solvent is developed to one-step in situ fibrillate wood via disrupting the hydrogen bonding networks in cell walls and simultaneously carboxylating wood components, without significantly altering the native hierarchical structures of wood. Benefiting from its distinctive cell wall structure composed of individualized yet well-organized lignocellulose nanofibrils, in situ fibrillated wood exhibits a prominent mesoporous structure with a specific surface area of 81 m 2 /g. It represents a robust sponge material (5 MPa at 80% strain) with excellent durability. Due to the enhanced compressibility and charge polarization capacity, the in situ fibrillated wood (10 × 11 × 12 mm 3 ) can generate a piezoelectric output voltage of up to 2 V under 221 kPa stress. The favorable microstructural characteristics render in situ fibrillated wood with highly thermal-insulating properties, high solar reflectivity, and mid-infrared emissivity, favoring outdoor passive cooling effects with a subambient temperature drop of 6 °C. Combining its controllable, durable, and eco-friendly attributes, our developed wood sponge represents a versatile structural material suitable for indoor/outdoor energy-saving applications.

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Section: Resultsmentioning

confidence: 90%

Versatile Mesoporous All-Wood Sponge Enabled by In Situ Fibrillation toward Indoor–Outdoor Energy Management and Conversion

Meng,

Liu,

Zhou

et al. 2024

ACS Appl. Mater. Interfaces

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Hydrogel‐Based Functional Materials for Thermoelectric Applications: Progress and Perspectives

Zhang,

Shi,

Liu

et al. 2024

Adv Funct Materials

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Hydrogels are renowned for their complex structures and unique physicochemical properties, establishing them as key materials in bioenergy harvesting applications. They are used in various applications, including triboelectric nanogenerators, piezoelectric, hydraulic, thermoelectric, and biofuel cells. Among these, hydrogels as key materials for thermoelectric applications represent a technology capable of continuously converting biological energy (thermal energy) into electrical energy. This technology shows great potential and commercial value in body monitoring, energy storage, and human‐machine interaction applications. Given its rapid development, a timely review focusing on the research progress of hydrogels and their composites in thermoelectric technology is presented. This review discusses various types of hydrogels used for thermoelectric power generation and refrigeration, their unique properties, strategies for enhancing their thermoelectric performance, and their applications in the field. Finally, the remaining challenges and feasible strategies are identified for improving the efficiency, stability, application range, and system‐level integration of next‐generation hydrogels for thermoelectric applications.

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3D printing of hydrogels for flexible micro‐supercapacitors

Baig,

Khan,

Ahmad

et al. 2024

FlexMat

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Advances in hydrogel technology have paved the way for novel and valuable capabilities that are being applied to a diverse spectrum of energy storage applications. Hydrogels, originally renowned for their biomedical applications, are now finding translation into the energy storage domain. These versatile materials exhibit promising potential for various energy‐related applications, including but not limited to acting as highly flexible electrolytes, facilitating the development of flexible supercapacitors, and contributing to advancements in energy conversion devices. The tunable properties of hydrogels, their high ion accessibility, and desirable mechanical characteristics position them as promising candidates for enhancing the performance and efficiency of energy storage systems. In this review, we emphasize the integration of hydrogels into flexible micro‐supercapacitors through 3D printing technology, unraveling the charge transport mechanisms inherent in hydrogels. We discuss methods for developing hydrogels with enhanced physicochemical properties, such as improved mechanical strength, flexibility, and charge transport, offering new prospects for next‐generation energy storage devices. With a deeper understanding of gelation chemistry, we showcase significant progress in fabricating stimuli‐responsive, self‐healing, and highly stretchable hydrogels. Furthermore, we present compelling examples highlighting the versatility of hydrogels, including tailorable architectures, conductive nanostructures, 3D frameworks, and multifunctionalities. The application of innovative 3D printing techniques in hydrogel design is poised to yield materials with immense potential in the realm of energy storage.

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Mixed Ionic–Electronic Conducting Hydrogels with Carboxylated Carbon Nanotubes for High Performance Wearable Thermoelectric Harvesters

Cited by 9 publications

References 78 publications

Versatile Mesoporous All-Wood Sponge Enabled by In Situ Fibrillation toward Indoor–Outdoor Energy Management and Conversion

Versatile Mesoporous All-Wood Sponge Enabled by In Situ Fibrillation toward Indoor–Outdoor Energy Management and Conversion

Hydrogel‐Based Functional Materials for Thermoelectric Applications: Progress and Perspectives

3D printing of hydrogels for flexible micro‐supercapacitors

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