Air‐Stable n‐Type Thermoelectric Materials Enabled by Organic Diradicaloids

Yuan, Dafei; Guo, Yuan; Zeng, Yan; Fan, Qingrui; Wang, Jianjun; Yi, Yuanping; Zhu, Xiaozhang

doi:10.1002/anie.201814544

Cited by 112 publications

(98 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Diradicals and diradicaloids are of great current interest because of their unique structural and conceptional value, but also because of their potential applications in thermoelectric generators and spintronics . In the literature, diradicals having triplet ground states and singlet ground states with thermally accessible low‐lying triplet states are described.…”

Section: Figurementioning

confidence: 99%

Quinoidal Azaacenes: 99 % Diradical Character

et al. 2020

View full text Add to dashboard Cite

Quinoidal azaacenes with almost pure diradical character (y=0.95 to y=0.99) were synthesized. All compounds exhibit paramagnetic behavior investigated by EPR and NMR spectroscopy, and SQUID measurements, revealing thermally populated triplet states with an extremely low‐energy gap ΔEST′ of 0.58 to 1.0 kcal mol−1. The species are persistent in solution (half‐life≈14–21 h) and in the solid state they are stable for weeks.

show abstract

Section: Figurementioning

confidence: 99%

Quinoidal Azaacenes: 99 % Diradical Character

et al. 2020

View full text Add to dashboard Cite

show abstract

“…These organic TMs demonstrated advantages for assembling flexible TEG devices, but their low Seebeck coefficient and low electrical conductivity resulted in poor ZT values as well as lower power factors than those of inorganic TMs, which limits their applications. To improve their thermoelectric properties, efforts were made to increase these polymers' conductivity by doping, dedoping, and implementing a hybrid with high conductive carbon/metal materials . For instance, Kim et al reported that the dimethyl sulfoxide (DMSO) doped PEDOT:PSS derived a maximum polymer ZT value of 0.42 at room temperature .…”

Section: Materials For Energy Conversion Devicesmentioning

confidence: 99%

Fiber‐Based Energy Conversion Devices for Human‐Body Energy Harvesting

et al. 2019

View full text Add to dashboard Cite

body is actually a tremendous storehouse of energy that is generated from body heat and motion. [15][16][17][18][19] Power generation from breathing, heating, blood transport, arm motion, typing, and walking could reach to over 100 W for a 68 kg adult's daily activities (Figure 1). [20] Thus, converting 1% of power from the human body may be enough to support the work of most portable electronics.In the past two decades, researchers have developed several energy conversion devices based on piezoelectricity, electrostaticity, triboelectricity, or thermoelectricity that can directly harvest the mechanical or thermal energy and convert it into electric energy (these conversion devices are so-called nanogenerators (NGs)). [21][22][23][24][25] The first nanogenerator (NG) based on ZnO was invented by Prof. Wang in 2006; after that, various NGs were developed to harvest the mechanical or thermal energy with the output performance increasing gradually. [26] These NGs are easy-to-construct flexible devices since most materials for these devices are polymers and nanomaterials. Generally, the flexible devices assembled by film materials can be stretchable and bendable in one direction. But their lack of air-permeability, poor 3D deformation, and low damage tolerance limit their application, especially for wearable electronics. Therefore, fiberbased energy conversion devices have been designed. [27] These fiber-based devices can also be knitted to yarn or fabric in the clothing system to build up a large area electronic system. [28,29] The energy generation and internal charging can be realized by means of a self-powered system that harvests the energy from natural sources around the human body to sustain the wearable electronics. [30][31][32] The search for functional materials that possess good conversion efficiency, as well as great mechanical and environmental stability, combined with a novel device design might push these devices to meet the requirement of a practical application. In the past decade, numerous contributions have been offered to improve the performance of fiber-based energy conversion devices (FBECD) and extend its application. This review specifically summarizes FBECD with different energy conversion mechanisms including piezoelectricity, electrostaticity, triboelectricity, and thermoelectricity in recent processes (Figure 2). The functional materials, fiber fabrication techniques, and device design strategies for different classes of FBECDs are covered in the article. We also introduce an overview of the fiber-based self-powered system and sensors and Following the rapid development of lightweight and flexible smart electronic products, providing energy for these electronics has become a hot research topic. The human body produces considerable mechanical and thermal energy during daily activities, which could be used to power most wearable electronics. In this context, fiber-based energy conversion devices (FBECD) are proposed as candidates for effective conversion of human-body energy into electricity...

show abstract

“…The covalently locked coplanar conformation of a conjugated ladder-type backbone, 1 in contrast with conventional non-ladder polymers with torsional rotation, allows for extensive intrachain delocalization of molecular orbitals and transport of quasi-particles such as charges, excitons, polarons, and spins. [2][3][4] The rigid coplanar conformation can also enhance interchain electronic coupling of conjugated ladder polymers due to the small reorganization energy of a rigid system upon electron transfer or photoexcitation, [5][6][7][8] which is important for solid-state materials properties. In addition, a signicantly higher activation energy is required to break the double-stranded backbones of a ladder polymer, translating to high stability that is important for applications under harsh conditions.…”

Section: Introductionmentioning

confidence: 99%