CHEMICAL PHYSICS LETTERS
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2025
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IF 3.1
Lei Cao,Lin Liu,Kaiyi Luo,Pingping Qian,Haowen Chen,Yixiao Deng,Lei Yang,Xiaoyong Wu,Jun Tang
Skutterudites (SKDs) are promising thermoelectric (TE) materials due to their cost-effectiveness and favorable electrical properties. However, their high thermal conductivity limits thermoelectric conversion efficiency. Herein, Y 2 O 3 nanoparticles (NPs)-decorated n-type Yb 0.3 Co 4 Sb 12 were prepared by spark plasma sintering (SPS). The heterointerfaces created by Y 2 O 3 nanoparticles enhance charge carrier localization through O-Sb hybridization and O-Co bonding, which increases the Seebeck coefficient. Additionally, heterointerfaces scatter phonons, reducing thermal conductivity. Consequently, a figure of merit ( ZT ) value of ∼1.48 at 773 K and an average ZT ave of ∼1.0 (293 ∼ 823 K) were achieved in this work.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
ACS Applied Electronic Materials
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2025
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IF 4.7
Runqiu Wu,Bendong Liu,Hongye Qin,Dongkun Yu,Jiahui Yang,Haibin Liu,Guohua Gao
The development of flexible wearable devices requires energy supply devices with high flexibility and stretchability. Thermoelectric ionic hydrogels possess characteristics of high flexibility and stretchability and can be used as heat conversion devices to transform low-grade heat energy into electrical energy. Recently, studies of ionic-thermoelectric hydrogels exhibit high thermopower (or Seebeck coefficient), but their raw materials are typically laced with strong alkalis or heavy metals, which makes them highly toxic and limits their potential applications. In order to enhance the thermopower in this study, we employed PEDOT:PSS as an n-type dopant in PAAm hydrogels to induce counterion condensation. This process immobilizes cations, thereby amplifying the ion-thermal migration rate disparity in the Soret effect and enhancing the thermopower. Furthermore, the thermoelectric performance was optimized by adjusting the dosage of the initiator ammonium persulfate (APS). The experimental results showed that the PEDOT:PSS/PAAm-based ionic hydrogel exhibited a high thermopower of −4.45 mV/K when the concentration of APS was 1 wt %. This study provides an approach for the preparation of low-toxicity, high-thermopower n-type thermoelectric ionic hydrogels.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
Journal of Materials Chemistry A
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2020
·Vol. 8
·期 19
·9797-9805
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IF 11.301
Junhui Tang,Ruisi Chen,Lidong Chen,Guillermo C. Bazan,Ziqi Liang
n-Type semiconducting polymers bearing high Seebeck coefficients (S) have been seldom employed in organic–inorganic thermoelectric nanocomposites (TENCs). Herein we illustrate how to exploit an n-type semiconducting polymer to fabricate TENCs comprising N2200 and metallic Co NWs, in which N2200 contributes significantly to the S of the TENCs. The TENCs exhibit a highest power factor (PF) of 288 μW m−1 K−2 at 80 wt% Co NWs. At a greater Co NW content, the organic/inorganic inter-connectivity deteriorates, owing to the rigid molecular chains of N2200, retarding the increase of electrical conductivity (σ) and also undermining the mechanical flexibility. Flexible n-type doped SWCNTs were therefore added to introduce additional conductive paths. At an optimal amount of SWCNTs (2 wt%), the σ increases to 1860 S cm−1, whereas S remains at approximately −45 μV K−1 and the bendability is improved. The maximal PF and zT values of the resulting ternary TENC reach 483 μW m−1 K−2 and 0.18 at 380 K, respectively. By pairing with p-type PEDOT:PSS/SWCNT thin films, the 6-legged flexible TEG yields maximum output voltage and power of 9.80 mV and 3.72 μW, respectively, when ΔT = 50 K. This work manifests a new avenue to both highly efficient and bendable thermoelectric materials through the judicious choice of multiple blend components.
研究领域:
材料科学
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能源技术
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高分子化学
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DOI
高影响因子
Advanced Science
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2024
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IF 14.3
Zelong Li,Wei Fu,Dorothea Scheunemann,Xiaoran Wei,Maximilian Litterst,Priya Mariam Viji,Yong Cui,Jianhui Hou,Junhui Tang,Ziqi Liang,Zehua Qu,Martijn Kemerink,Ruiqian Guo,Guangzheng Zuo
The trade-off between enhancing conductivity (σ) through doping while concurrently observing a reduction in the Seebeck coefficient ( S ) presents a key challenge in organic thermoelectrics. Here, a two-step structural design strategy is developed, where the first step enhances the backbone planarity which enhances the conductivity by an improved ordering of conjugated polymers (CPs). The second step, which is fluorination of the backbone, improves the Seebeck coefficient by the controlled induction of energetic disorder, stemming from the fluorine's disruption of the homogeneous electrostatic potential across the CP backbone. This strategy is applied to two series of donor-acceptor (D-A) types of CPs based on the BDT donor unit and BDD and TT as acceptor units, respectively. A maximum power factor ( PF ) over 155 (142.7 ± 12.7) µW m −1 K −2 , coupled with S ≈202 (194.6 ± 7.6) µV K −1 is achieved, leading to up to 32-fold enhancement of the PF compared to the initial non-planar and non-fluorinated polymer. This study provides valuable conceptual insights for designing CPs with high conductivity and Seebeck coefficient.
研究领域:
材料科学
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有机电子学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2025
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IF 8.2
Shigui Peng,Kai Zhang,Min He,Qiao Fan,Lanlan Wei,Shuhao Qin,Tingting Luo,Lijuan Long,Jun Qin,Yufei Liu,Jie Yu
Poly(3,4-ethylenedioxythiophene) (PEDOT) is a prospective thermoelectric polymer owing to high conductivity, low thermal conductivity, and processability. However, the Seebeck coefficient of PEDOT is substantially lower than inorganics, and molecular design strategies to promote this coefficient are yet to be established. Here, the introduction of chloromethyl (-MeCl) on the surface of PEDOT has been established as an effective strategy for elevating its Seebeck coefficient. It was found that the electron-withdrawing effect of -MeCl decreases the highest occupied molecular orbital (HOMO) energy level and increases the oxidation potential of poly(chloromethylated 3,4-ethylenedioxythiophene) (PEDOT-MeCl). The space steric hindrance effect of -MeCl increases the layer spacing of PEDOT-MeCl. Furthermore, -MeCl severely disrupts the localized coplanar structure of PEDOT-MeCl, leading to a more difficult transition of the polariton into a dipolariton. Hence, PEDOT-MeCl is more difficult to be oxidatively doped, and the oxidation level is reduced compared to PEDOT. This ultimately leads to a 22.57% decrease in carrier concentration and a 33.06% increase in Seebeck coefficient for PEDOT-MeCl. This work opens up a new pathway for modulate the Seebeck coefficient of PEDOT.
研究领域:
材料科学
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化学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
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2020
·Vol. 8
·期 9
·4931-4937
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IF 11.301
Zhiwei Huang,Dongyang Wang,Caiyun Li,Jinfeng Wang,Guangtao Wang,Li-Dong Zhao
In this work, the thermoelectric performance of p-type PbSe was improved dramatically by enhancing the Seebeck coefficient and reducing electronic thermal conductivity through CdTe alloying. CdTe alloying effectively increased the effective mass of p-type Pb0.98Na0.02Se due to band flattening and promoting the valence band convergence, which contributed to a high Seebeck coefficient of ∼238 μV K−1 at 860 K and large power factor of ∼18.2 μW cm−1 K−2 at 860 K for Pb0.98Na0.02Se + 4% CdTe. Furthermore, CdTe alloying reduced the carrier mobility of Pb0.98Na0.02Se due to the enhanced scattering of impurity atoms, which results in a remarkable reduction of electronic thermal conductivity. As a result, due to its higher power factor and lower thermal conductivity, a high thermoelectric figure of merit ZT ∼1.5 at 860 K was achieved for Pb0.98Na0.02Se + 4% CdTe. This paper provides one novel approach to enhance the thermoelectric performance of p-type PbSe through synergistically manipulating electrical and thermal transport properties.
研究领域:
材料科学
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物理学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Ze Li,Wen-Jie Li,Jun Guo,Zi-Yuan Wang,Xing Yang,Yu-Ke Zhu,Tian-En Shi,Yi-Xin Zhang,Jing Feng,Zhen-Hua Ge
SnSe materials have attracted extensive attention in thermoelectrics due to their low thermal conductivity. Nevertheless, the thermoelectric properties of n-type polycrystalline SnSe are still low, and metallic Sn distributed in the SnSe1–x materials would affect the repeatability of thermoelectric performance. Herein, the thermoelectric properties of n-type polycrystalline SnSe0.95-based composites are highly enhanced by heterogeneous Cu doping. The carrier concentration of the SnSe0.95 material was optimized by SnCl2 doping. The strategy of heterogeneous Cu doping is employed in further improving the thermoelectric performance of the SnCl2-doped SnSe0.95 materials. In addition, partial Cu+ doping tunes the electron concentration to enhance the Seebeck coefficient. Moreover, metallic Sn distributed along the grain boundaries can be stabilized by forming Cu6Sn5 alloys, which improve the thermal stability of bulk composites. Excessive Cu particles and SnCl2 precipitates strengthen phonon scattering for lowering the lattice thermal conductivity. Ultimately, a peak ZT of 1.55 is yielded at 773 K in the SnSe0.95–1 wt % SnCl2–1 wt % Cu bulk composite, whose mechanical hardness is also increased. Hence, these results promote a feasible approach to simultaneously enhance the thermoelectric and mechanical properties of n-type SnSe-based composites, which might be worth exploring in other thermoelectric materials.
研究领域:
材料科学
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热电学
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DOI
PubMed
高影响因子
Advanced Materials Interfaces
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2022
·Vol. 9
·期 24
·2201165
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IF 6.389
Xiaohan Xu,La Li,Weijia Liu,Zhongming Chen,Di Chen,Guozhen Shen
Thermally chargeable supercapacitors (TCSCs) are emerging and promising devices that could convert thermal energy spontaneously existing in nature into electricity and then store energy for further utilization. Herein, this work reports on the freestanding 3D Ti 3 C 2 T x MXene-based TCSC, where lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), poly(ethylene oxide) (PEO), and polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) serve as gel electrolyte. Different from the semiconductor-based thermoelectric materials, the fabricated Ti 3 C 2 T x TCSC exhibits a high Seebeck coefficient of 78.4 mV K −1 . Moreover, when applying a temperature difference (ΔT) of 5.8 K between the cold and hot sides, the Ti 3 C 2 T x TCSC devices provide a stable high voltage of 400.6 mV. The charging/discharging cycles of the Ti 3 C 2 T x TCSC devices upon periodic Δ T of 3.3 and 5.8 K demonstrate their excellent stability. To realize the practical application, the four Ti 3 C 2 T x TCSCs devices connected in series are charged by supplying a Δ T of 5.8 K and used to power a digital timer, demonstrating the possibility and application of the TCSCs in self-powered integrated electronics.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
Chemistry-An Asian Journal
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2018
·Vol. 13
·期 21
·3246-3253
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IF 3.692
Sanyin Qu,Qin Yao,Bingxue Yu,Kaiyang Zeng,Wei Shi,Yanling Chen,Lidong Chen
Graphical Weight problem : Poly(3-hexylthiophene) (P3HT) films with various molecular weights are successfully prepared, and both their molecular structures and thermoelectric (TE) properties are investigated. The molecular weight of P3HT is found to have an important effect on the carrier-transport properties by affecting the molecular structure and, as a result, also has an effect on the TE performance. Poly(3-hexylthiophene) (P3HT) films with various molecular weights (MWs) were successfully prepared, and both their molecular structures and thermoelectric (TE) properties were investigated. It was found that the molecular weight of P3HT had an important effect on the carrier-transport properties by affecting the molecular structure and, as a result, also had an effect on the TE performance. The electrical conductivity of the P3HT films first increased upon increasing the molecular weight and then decreased at high molecular weights, whereas the Seebeck coefficient remained at the same level. As a result, the P3HT-M 50k (MW≈50 000 g mol −1 ) film reached an electrical conductivity of (103.8±1.2) S cm, which is more than 20 times higher than the electrical conductivity of P3HT-M 10k (MW≈10 000 g mol −1 ) and almost 30 % higher than the electrical conductivity of P3HT-M 100k (MW≈100 000 g mol −1 ). Consequently, the maximum TE power factor of P3HT-M 50k at room temperature was as high as (22.6±0.6) μW mK −2 , which is much higher than that of either P3HT-M 10k or P3HT-M 100k . Microstructure analysis combined with C-AFM suggested that carrier transport between most of the ordered and amorphous regions was unconnected in films with low molecular weights, and this resulted in a high migration barrier and poor carrier mobility. Upon increasing the molecular weight, the long molecular chain provided enough connectivity for the charge to move through the ordered regions, which decreased the carrier barrier and increased carrier mobility. Therefore, both the conductivity and Seebeck coefficient were significantly improved. However, a too-high molecular weight could cause more folding of the polymer chain, which would deteriorate the electrical-transport properties. The experimental results not only reveal the intrinsic effect of molecular weight on the electric transporting properties of conducting polymers but also suggest that molecular-weight engineering is an effective way to design and screen high-performance polymer TE materials.
研究领域:
材料科学
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物理化学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
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2014
·Vol. 4
·期 107
·62096-62104
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IF 3.708
Junjie Li,Lei Wang,Xiaole Jia,Xiongzhi Xiang,Cheuk-Lam Ho,Wai-Yeung Wong,Hua Li
Polymer–inorganic composites show great potential for use as thermoelectric (TE) materials. However, the TE performance of these materials needs to be improved. One way to improve the TE performance would be to synthesize novel conductive polymers with high Seebeck coefficients to prepare polymer–inorganic TE composites. In this study, acidized and ammoniated forms of poly[(3-methylthiophene-2,5-diyl)(diphenylaminobenzylidene)(3-methylthiophene quinodimethane-2,5-diyl)] (PMTDPABQ) were successfully synthesized with high Seebeck coefficients. These polymers were used to prepare a series of PMTDPABQ/graphite (G) bulk composites by mechanical ball milling and cold pressing. The morphology, thermal stability, and TE performance of these composites were evaluated. The G was uniformly dispersed in the polymer matrix, and the composite materials exhibited good thermal stability at temperatures up to 200 °C. The acidized PMTDPABQ/G composites exhibited better TE performance than the ammoniated PMTDPABQ/G composites. The highest TE figure of merit, ZT = 5.32 × 10−3, was obtained using acidized PMTDPABQ/G and was approximately 3 times greater than that of polythiophene (PTh)/G (1.37 × 10−3).
研究领域:
材料科学
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聚合物化学
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产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
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2017
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IF 4.873
Haijun Song,Yang Qiu,Yao Wang,Kefeng Cai,Delong Li,Yuan Deng,Jiaqing He
Flexible and lightweight thermoelectric (TE) generators have attracted increasing interest for powering wearable electronics using the temperature difference between human body and ambient air. Conducting polymers or their based composite materials are suitable for such applications; however, most conducting polymers show p-type conduction, hence, until now almost all reported flexible TE generators, which use conducting polymers or their based composite materials, are single-carrier-type (p-type) leg devices, connecting alternatively p-type legs electrically in series with silver or other metals. In this paper, both p- and n-type flexible TE materials have been developed using polymers and single-walled carbon nanotubes (SWCNTs). The p-type TE films are prepared by integrating SWCNTs into a high conductive poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) matrix, using a dilution-filtration method. N-type TE films with Seebeck coefficient about -35 μV/K are realized by treating SWCNTs with polyethyleneimine (PEI), and an encapsulation process has been employed to effectively preserve its n-type characteristics. Benefited from the flexibility of both the substrate and the composite films , a flexible TE prototype composed of six p-n junctions connected in series has been fabricated to demonstrate TE voltage output and power generation . The output power from the prototype is 220 nW for a 50 K temperature gradient.
研究领域:
材料科学
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能源技术
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电子工程
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
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2021
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IF 6.024
Minzhi Du,Xinyi Chen,Kun Zhang
Ionic liquids (ILs) have been reported to modulate the thermoelectric properties of conducting polymers. However, there is still a lack of comprehensive understanding of the effects of ILs on their thermoelectric transport. Herein, we selected 1-ethyl-3-methylimidazolium dicyanamide (EMIM:DCA) to post-treat free-standing PEDOT nanowire (NW) films and the effects on thermoelectric performance were fully explored. EMIM:DCA post-treatment simultaneously increases the Seebeck coefficient (87% increment) and electrical conductivity (24% increment) of PEDOT NWs, resulting in an optimal power factor of 83.8 μW m–1 K–2 at room temperature. It demonstrates the first ever-reported free-standing IL/polymer composites and outperforms the majority of all IL/polymer composites. Based on experimental characterizations, we elucidate that IL-induced dedoping and the Soret effect synchronously determine the Seebeck coefficient enhancement, where the Soret effect plays a dominant role, accounting for 79.9% for PEDOT NW films with 80 wt % EMIM:DCA. By means of X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), and X-ray diffraction (XRD), we further confirm that IL-induced dedoping contributes to phase segregation and compact stacking of PEDOT chains, resulting in lowered carrier concentration for the enhanced Seebeck coefficient and facilitating carrier transport for higher electrical conductivity. More importantly, through Kang–Snyder transport modeling, we first find that the improved transport coefficient (σE0) by IL-induced dedoping also contributes to the Seebeck coefficient enhancement, shedding light on the mechanism that can be adopted to design high-performance thermoelectric materials with conducting polymers.
研究领域:
材料科学
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物理化学
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产品关联
DOI
高影响因子
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