Article
Materials Science, Ceramics
Xianke Wu, Ziyu Wang, Zhenhua Zhang, Yong Liu, Jing Shi, Rui Xiong
Summary: In this study, the addition of Ag2Se and Fe3O4 particles was investigated to improve the thermoelectric performance of Bi2Te2.7Se0.3 materials. It was found that the incorporation of Fe3O4 particles significantly enhanced the performance, with the highest recorded ZT value of 0.89.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Wenjie Huang, Xiaojian Tan, Jianfeng Cai, Shuai Zhuang, Chuandong Zhou, Jiehua Wu, Guoqiang Liu, Bo Liang, Jun Jiang
Summary: In this study, the thermoelectric performance of zone-melted n-type Bi2Te2.7Se0.3 material is significantly improved by co-doping with BiI3 and SnSb2Te4. BiI3, a non-toxic and non-hygroscopic electron dopant, effectively enhances the power factor and partially suppresses the bipolar effect of n-type Bi2Te2.7Se0.3. SnSb2Te4 doping introduces new scattering centers, resulting in a relatively low lattice thermal conductivity of 0.72 W m(-1) K-1 at 300 K. As a result, a maximum ZT value of 1.30 at 325 K and an average ZT value of 1.00 in the temperature range of 300-500 K are achieved in the Bi2Te2.Se-7(0.3) + 0.15 wt% BiI3 + 0.15 wt% SnSb2Te4 sample. This work provides a feasible approach to effectively improve the thermoelectric performance of n-type zone-melted Bi2Te3.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Physical
Yong-Jae Jung, Hyun-Sik Kim, Jong Ho Won, Minkyung Kim, Minji Kang, Eun Young Jang, Nguyen Vu Binh, Sang-il Kim, Kyoung-Seok Moon, Jong Wook Roh, Woo Hyun Nam, Sang-Mo Koo, Jong-Min Oh, Jung Young Cho, Weon Ho Shin
Summary: This study investigates the introduction of Cu2Te nanoparticles into Bi2Te2.7Se0.3 n-type materials to enhance their thermoelectric properties. The homogeneous dispersion of Cu2Te nanoparticles was achieved and resulted in improved power factor and reduced lattice thermal conductivity. The incorporation of Cu2Te nanoparticles also increased the dimensionless figure of merit ZT, making it a promising approach for temperature-dependent ZT control.
Article
Chemistry, Multidisciplinary
Qingyi Li, Zichen Wei, Quanying Ma, Zhili Li, Jun Luo
Summary: Doping with trace amounts of Cd and adding excess Bi are effective ways to optimize carrier concentration and achieve enhanced room-temperature thermoelectric performance for the Bi2Te2.7Se0.3 alloy.
Article
Nanoscience & Nanotechnology
Xinyu Chen, Juan Li, Qing Shi, Yiyuan Chen, Houjun Gong, Yanping Huang, Liwei Lin, Ding Ren, Bo Liu, Ran Ang
Summary: Introducing Cu into Bi2Te3 matrix along with high-energy ball milling and hot pressing can significantly enhance the thermoelectric figure of merit zT in both in-plane and out-of-plane directions in polycrystalline n-type CuxBi2Te2.7Se0.3 samples. The intercalated Cu improves electron mobility and reduces lattice thermal conductivity, leading to isotropic thermoelectric properties.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Ceramics
Qiujun Hu, Junbiao Guo, Hanyang Zuo
Summary: By utilizing an interface engineering strategy, a promising ZT value (ZT = 1.33) was achieved in n-type Bi2Te2.7Se0.3 (BTS) materials, which greatly enhances the performance of Bi2Te3-based energy converters.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Sang-Seok Lee, Injoon Jang, Jong-Soo Rhyee, Soon-Jik Hong, Sung Jong Yoo, Il-Kyu Park
Summary: In this study, a thermoelectric nanocomposite structure was fabricated by decorating Mo nanoparticles on the surface of Bi2Te2.7Se0.3 powders, leading to a simultaneous decrease in thermal conductivity and electrical resistivity, and a significant enhancement in ZT values.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Yufeng Xu, Xianke Wu, Bo Zhu, Yong Liu, Jing Shi, Rui Xiong, Ziyu Wang
Summary: In this work, a strategy to enhance the performance of n-type Bi2Te2.7Se0.3 crystal by adding CuS nanoparticles is reported. The insertion of CuS NPs effectively improves the Seebeck coefficient and decreases the thermal conductivity, resulting in improved thermoelectric properties. The highest achieved ZT value is 0.89, which is 1.37 times higher than that of the pure crystal.
Article
Materials Science, Ceramics
Qiujun Hu, Junbiao Guo, Hanyang Zuo, Haowen Chen
Summary: By dispersing TiO2 ceramic nanoparticles in the matrix of BTS material, the electrical and thermal characteristics of n-type Bi2Te2.7Se0.3 were significantly enhanced. The addition of TiO2 nanoparticles increased the Seebeck coefficient, while the dislocations at the TiO2/BTS interface and the increase in grain boundary density led to a decrease in lattice thermal conductivity. The maximum ZT value of the BTS + 3 wt% TiO2 sample increased to 1.31, representing a 52% improvement over the pristine sample. This study presents a viable approach for the rational design of advanced n-type Bi2Te2.7Se0.3 materials.
CERAMICS INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Qiujun Hu, Wenbin Qiu, Longqing Chen, Jie Chen, Lei Yang, Jun Tang
Summary: In this study, n-type Bi2Te2.7Se0.3 based thermoelectric materials incorporated with nanosized Y2O3 were prepared and studied, leading to significantly improved thermoelectric performance due to the multiscale interface modifications induced by the Y2O3 nanoparticles. The addition of Y2O3 NPs effectively reduced the thermal conductivity, increased the hardness, and maintained excellent thermoelectric properties in the entire operating temperature range. The strategy of high-density heterogeneous interfaces implemented by Y2O3 NP addition provides a feasible pathway for fabricating high-performance thermoelectric materials with optimized properties.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Cheng-Lung Chen, Te-Hsien Wang, Zih-Gin Yu, Yohanes Hutabalian, Ranganayakulu K. Vankayala, Chao-Chih Chen, Wen-Pin Hsieh, Horng-Tay Jeng, Da-Hua Wei, Yang-Yuan Chen
Summary: This study reports a strategy to enhance the performance of n-type Bi2Te2.7Se0.3 crystals up to ZT = 1.42 near room temperature through a two-stage process. By stabilizing Seebeck coefficient and optimizing phonon and carrier transport, a high power factor (PF) and ZT were achieved. This work offers a new approach to improve n-type layered thermoelectric materials.
Article
Engineering, Environmental
Tao Chen, Xiaoying Qin, Hongwei Ming, Xuemei Zhang, Ziyuan Wang, Shuhuan Yang, Yongsheng Zhang, Zhenhua Ge, Hongxing Xin, Di Li, Jian Zhang
Summary: By dispersing transition-metal selenide MnSb2Se4 (MSS) into Bi2Te2.7Se0.3 (BTS), the power factor (PF) of BTS can be greatly increased while the lattice thermal conductivity (kappa L) can be significantly reduced. The BTS/0.50 wt% MSS sample achieves a large ZTmax of 1.23 (at 345 K) and an average ZTave of -1.15 (300 K-473 K), which are respectively 48% and 42% larger than those of pristine BTS. Additionally, this sample also exhibits improved mechanical properties.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Junsang Cho, Sang-il Kim, Yurian Kim, Hyun-Sik Kim, Taegyu Park, Sung Wng Kim
Summary: This study investigated the enhanced thermoelectric properties of n-type Bi-2(Te,Se)(3) materials by adding Cu nanoparticles via high-energy ball milling. By controlling the carrier and reducing the electronic thermal conductivity, the dimensionless thermoelectric figure of merit (zT) was significantly improved, reaching a maximum value of 0.85 at 375 K for the 2% Cu-doped Bi2Te2.7 Se-0.3 sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Inorganic & Nuclear
Tao Chen, Hongwei Ming, Xiaoying Qin, Chen Zhu, Yong Chen, Li Ai, Di Li, Yongsheng Zhang, Hongxing Xin, Jian Zhang
Summary: The incorporation of Ag9AlSe6 phase into BTS can significantly reduce lattice thermal conductivity and enhance the Seebeck coefficient, leading to an improvement in thermoelectric performance.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Engineering, Environmental
Gang Wu, Xiaojian Tan, Minhui Yuan, Qiang Zhang, Jacques G. Noudem, Zehua Liu, Chen Cui, Jiehua Wu, Haoyang Hu, Peng Sun, Guo-Qiang Liu, Jun Jiang
Summary: A n-type Bi2Te2.7Se0.3 + x wt% PbI2 polycrystalline material with high texture degree and various microstructures was prepared by the temperature gradient method. The dilute PbI2 doping not only adjusted the carrier concentration to an optimal level but also reduced the lattice thermal conductivity, resulting in a peak ZT of 1.26 and improved Vickers hardness of 0.48 GPa.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Gang Chen
Summary: This article provides perspectives on the current understanding of thermophysical properties and transport processes in liquids at the molecular level. It discusses the peculiarities of thermophysical properties of common liquids using experimental data and summarizes existing molecular models and theoretical approaches. The article highlights the poor current understanding of thermophysical properties of liquids and suggests potential directions for future research.
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
(2022)
Article
Multidisciplinary Sciences
Zhiwei Ding, Ke Chen, Bai Song, Jungwoo Shin, Alexei A. Maznev, Keith A. Nelson, Gang Chen
Summary: In this study, the authors reported the direct observation of temperature wave (second sound) in graphite at a record-high temperature of over 200 K. They used experimental techniques and simulations to explain the role of thermal zero sound and the interplay among different groups of phonons.
NATURE COMMUNICATIONS
(2022)
Editorial Material
Multidisciplinary Sciences
Gang Chen
Article
Multidisciplinary Sciences
Jiawei Zhou, Hangtian Zhu, Qichen Song, Zhiwei Ding, Jun Mao, Zhifeng Ren, Gang Chen
Summary: Through first-principles simulation, the authors found that certain dopants can cloak themselves from electrons and achieve higher mobility than the conventional limit.
NATURE COMMUNICATIONS
(2022)
Article
Thermodynamics
Gang Chen
Summary: This paper establishes three interfacial boundary conditions based on the Boltzmann transport equation to connect the temperature, density, and pressure jumps at the liquid-vapor interface to the interfacial mass and heat fluxes. These expressions can be coupled with heat and mass transport equations in the liquid and vapor phases to determine the values of the interfacial temperature, density, and pressure jumps. The results are compared favorably with past experiments, and a thermomolecular emission model is presented for molecular-level insights on thermal evaporation processes.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Multidisciplinary Sciences
Chaitanya A. Gadre, Xingxu Yan, Qichen Song, Jie Li, Lei Gu, Huaixun Huyan, Toshihiro Aoki, Sheng-Wei Lee, Gang Chen, Ruqian Wu, Xiaoqing Pan
Summary: Spatially resolved vibrational mapping of nanostructures is crucial for the development and understanding of thermal nanodevices and novel nanostructured materials. In this study, we demonstrate two-dimensional spatial mapping of phonons in a silicon-germanium quantum dot and observe nanoscale modification of phonon properties and non-equilibrium phonon dynamics at the interface.
Article
Multidisciplinary Sciences
Jungwoo Shin, Geethal Amila Gamage, Zhiwei Ding, Ke Chen, Fei Tian, Xin Qian, Jiawei Zhou, Hwijong Lee, Jianshi Zhou, Li Shi, Thanh Nguyen, Fei Han, Mingda Li, David Broido, Aaron Schmidt, Zhifeng Ren, Gang Chen
Summary: Semiconductors with high thermal conductivity and electron-hole mobility are crucial for electronic and photonic devices as well as for fundamental studies. Cubic boron arsenide (c-BAs), with its ultrahigh thermal conductivity and ambipolar mobility, shows promise as a candidate material for next-generation electronics.
Article
Chemistry, Physical
Yoo Kyung Go, Jungwoo Shin, Gang Chen, Cecilia Leal
Summary: This paper investigates the precise control of BCP crystallization using 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) phospholipid additives, demonstrating that hybridization can alter heat transport properties.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Zhantao Chen, Xiaozhe Shen, Nina Andrejevic, Tongtong Liu, Duan Luo, Thanh Nguyen, Nathan C. C. Drucker, Michael E. E. Kozina, Qichen Song, Chengyun Hua, Gang Chen, Xijie Wang, Jing Kong, Mingda Li
Summary: One central challenge in understanding phonon thermal transport is a lack of experimental tools to investigate frequency-resolved phonon transport. This study presents a framework that integrates ultrafast electron diffraction and scientific machine learning to uncover microscopic phonon transport information in heterostructures. The framework successfully recovers frequency-dependent interfacial transmittance and relaxation times, revealing a transport pattern beyond the diffuse mismatch model.
ADVANCED MATERIALS
(2023)
Article
Optics
Isaac Metcalf, Gang Chen, Thomas A. Cooper
Summary: We present near-ideal axisymmetric numerically optimized spline concentrators (OSCs) that outperform the compound parabolic concentrator (CPC). By perturbing the CPC profile through a variable-offset spline defined in tangent-normal space, we demonstrate a reduction in ray rejection by almost half without increasing concentrator length. The resulting OSCs achieve acceptance efficiencies up to 99.3% for a 45-degree acceptance angle, the highest reported for any finite-length CPC-like light concentrator. A set of design curves is provided to generate near best-form OSCs for acceptance angles ranging from 10 to 45 degrees.
Article
Physics, Multidisciplinary
Buxuan Li, Freddy DeAngelis, Gang Chen, Asegun Henry
Summary: In this study, lattice dynamics and molecular dynamics were used to analyze the thermal conductivity of amorphous polymers. An abnormally large population of localized modes was found, which is different from amorphous inorganic materials. The results suggest that localized modes play a key role in thermal transport for different polymers.
COMMUNICATIONS PHYSICS
(2022)
Article
Chemistry, Physical
Gang Chen
Summary: This paper investigates the temperature inversion phenomenon during evaporation and condensation between two parallel plates. The study reveals that the temperature at the liquid surface is higher than the adjacent vapor temperature on the evaporating interface, and lower than the adjacent vapor temperature on the condensing interface. This phenomenon can be explained by interfacial cooling and heating processes.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Qian Xu, Biao Deng, Lenan Zhang, Shaoting Lin, Zhijia Han, Qing Zhou, Jun Li, Yongbin Zhu, Feng Jiang, Qikai Li, Pengxiang Zhang, Xinbo Zhang, Gang Chen, Weishu Liu
Summary: This study presents a bulk-material-based f-TEG with multifunctional copper electrodes and fabrics, which improves heat concentration, dissipation, comfort, and heat-leakage reduction. The results show that the f-TEG achieves high output power density and illumination performance under specific environmental conditions.
CELL REPORTS PHYSICAL SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Qichen Song, Jiawei Zhou, Gang Chen
Summary: The study investigates charge transport across Si/Ge interfaces using Green's functions, finding differences between perfect interfaces and those with atomic mixing. Non-specular transmission channels at mixed interfaces significantly reduce contact resistance.
Article
Chemistry, Physical
Gang Chen
Summary: Most thermodynamic modeling of hydrogels is based on Flory's and Donnan's theories. This study reformulates Flory's model to explore the thermodynamic properties of hydrogels and applies it to study the properties of pure and salty water in hydrogels.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
