Article
Chemistry, Physical
Yuping Wang, Shulin Bai, Haonan Shi, Qian Cao, Bingchao Qin, Li-Dong Zhao
Summary: In recent years, the thermoelectric properties of SnSe crystals have shown remarkable performance, however, the polycrystalline SnSe has been hindered by grain boundary scattering, which leads to reduced carrier mobility and electrical transport. This research introduces the tetragonal-structure AgInSe2 and Ge alloying to modify the crystal structure and band structure of SnSe, enhancing carrier mobility and suppressing phonon transport. This systematic approach effectively decouples phonon-electron transport, resulting in significantly improved thermoelectric performance.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Jinchang Sun, Wenjun Cui, Chenghao Xie, Tian Yu, Fan Yan, Zhiquan Chen, Xiahan Sang, Xinfeng Tang, Gangjian Tan
Summary: In this study, the presence of Pb vacancies in Sn-substituted Pb0.98Na0.02Se was effectively inhibited by doping a dilute amount of Te, leading to a remarkable recovery of carrier mobility. Moreover, Te doping resulted in a significant reduction in lattice thermal conductivity by reinforcing phonon scattering. As a result, the average ZT value of Pb0.97Sn0.01Na0.02Se was doubled upon 6 mol % Te doping between 300 and 773 K.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Multidisciplinary Sciences
Lizhong Su, Dongyang Wang, Sining Wang, Bingchao Qin, Yuping Wang, Yongxin Qin, Yang Jin, Cheng Chang, Li-Dong Zhao
Summary: Thermoelectric materials offer the potential for direct conversion of heat into electricity. Phonon-electron decoupling plays a critical role in achieving high-performance thermoelectrics.
Article
Multidisciplinary Sciences
Bingchao Qin, Dongyang Wang, Tao Hong, Yuping Wang, Dongrui Liu, Ziyuan Wang, Xiang Gao, Zhen-Hua Ge, Li-Dong Zhao
Summary: Researchers achieve high-performance SnSe crystals with promising device efficiencies by modifying crystal and band structures.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Sergey S. Nikitin, Alexey A. Markov, Ilia A. Leonidov, Mikhail Patrakeev
Summary: By thermodynamic analysis of defect equilibrium, the electrical conductivity of perovskite-type Sr1-xCexFeO3-δ was studied, showing a minor contribution of electrons localized on cerium ions to conductivity. An almost 10-fold decrease in ion conductivity was found with the increase of cerium content in Sr1-xCexFeO3-δ, attributed to a decrease in the mobility of oxygen ions, while having an insignificant effect on hole and electron conductivity.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Qin Wang, Jiamian Huang, Chenyang Wang, Pengfei Luo, Zhili Li, Rongtao Liu, Qunaying Ma, Jun Luo
Summary: In this study, an effective method to reduce the lattice thermal conductivity of NbCoSn-based half-Heusler alloys through isoelectronic substitution of Ta for Nb has been demonstrated, leading to improved thermoelectric performance by about 32% compared to the matrix material.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Multidisciplinary Sciences
Binbin Jiang, Yong Yu, Juan Cui, Xixi Liu, Lin Xie, Jincheng Liao, Qihao Zhang, Yi Huang, Shoucong Ning, Baohai Jia, Bin Zhu, Shengqiang Bai, Lidong Chen, Stephen J. Pennycook, Jiaqing He
Summary: By utilizing entropy-driven structural stabilization, we increased the figure of merit (zT) value to 1.8 in an n-type PbSe-based high-entropy material at 900 kelvin, showcasing a promising method to enhance the performance of thermoelectric materials.
Article
Physics, Applied
Jialu Wang, Wanghua Hu, Zhefeng Lou, Zhuokai Xu, Xiaohui Yang, Tao Wang, Xiao Lin
Summary: In this study, the thermoelectric properties of Bi2O2Se single crystals were investigated, showing high electron mobility and low thermal conductivity near room temperature. The results indicate that the system approaches the Ioffe-Regel limit at high temperatures due to intense anharmonic phonon-phonon scattering, suggesting a further improvement in thermoelectric performance compared to polycrystals.
APPLIED PHYSICS LETTERS
(2021)
Article
Energy & Fuels
N'dri Arthur Konan, Mary Ann Clarke, Hossain Aziz, Mehrdad Shahnam
Summary: This study numerically examines the oxygen production through air separation using the redox cycle reactions of Sr1-xCaxFeO3-δ perovskite particles. The results show that the oxygen production can be enhanced by 4% through thermal management at 500 degrees C. Additionally, increasing the operating temperature to 550 degrees C can significantly increase the oxygen production by approximately 30%.
Article
Chemistry, Physical
Preeti Bhumla, Manjari Jain, Sajjan Sheoran, Saswata Bhattacharya
Summary: The study investigates Cs2BI6 as potential thermoelectric materials and reveals that vacancy-ordered double perovskites exhibit high lattice anharmonicity and excellent thermoelectric properties, making them suitable for renewable energy applications.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Hu Chen, Maximilian Moser, Suhao Wang, Cameron Jellett, Karl Thorley, George T. Harrison, Xuechen Jiao, Mingfei Xiao, Balaji Purushothaman, Maryam Alsufyani, Helen Bristow, Stefaan De Wolf, Nicola Gasparini, Andrew Wadsworth, Christopher R. McNeill, Henning Sirringhaus, Simone Fabiano, Iain McCulloch
Summary: In this study, three n-type fused lactam semiconducting polymers were synthesized via a transition-metal free aldol polycondensation method, showing progressively larger electron affinities as the central acene core size decreases. The N-N and A-N polymers exhibited the highest charge carrier mobilities and power factors among the three polymers, representing promising candidates for high-performance n-type materials in thermoelectric applications. The results highlight the effectiveness of modulating the size of the central acene ring as a molecular design strategy to optimize the electronic and thermoelectric performance of conjugated polymers.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Keigo Takahashi, Hiroyasu Matsuura, Hideaki Maebashi, Masao Ogata
Summary: We present systematic theoretical results on thermoelectric effects in semimetals based on the variational method of the linearized Boltzmann equation. By treating the inelastic electron-hole scattering more precisely beyond the relaxation-time approximation, we show that the Seebeck coefficient when compensated depends on the screening length of the Coulomb interaction as well as the Lorenz ratio. The result indicates that uncompensated semimetals with the electron-hole scattering have high thermoelectric efficiency when the phonon contribution to thermal conductivity is suppressed.
Article
Chemistry, Inorganic & Nuclear
Rupesh Mandal, Yogendra Mahton, Chelluri Sowjanya, Kumar Sanket, Shantanu K. Behera, Swadesh K. Pratihar
Summary: In this study, a series of La0.5Sr0.5Co0.8Fe0.2-xCuxO3-delta perovskite oxides were synthesized, and the effect of partial Cu substitution on the OER performance was investigated. The results showed that partial substitution of Fe with Cu enhanced the catalytic activity and stability of La0.5Sr0.5Co0.8Cu0.2O3-delta oxide for OER in alkaline media.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Jianghe Feng, Menghui Zhou, Juan Li, Guoying Dong, Shufang Gao, Erbiao Min, Chuang Zhang, Jiaqing He, Rong Sun, Ruiheng Liu
Summary: An oriented crystal hot-deformation method was used to realize coarse crystalline InTe material with high texture along the [110] direction, exhibiting advantageous properties for thermoelectric performance improvement. The resulting high texture grains not only maintained the preferred orientation of the zone-melting crystal but also suppressed grain boundary scattering, leading to high power factor and figure of merit values. Integrating p-type InTe and commercial n-type Bi2Te2.7Se0.3 legs, an 8-couple thermoelectric generator module achieved a high conversion efficiency comparable to traditional Bi2Te3 based modules.
MATERIALS HORIZONS
(2023)
Article
Chemistry, Multidisciplinary
Xiao Xu, Yi Huang, Xixi Liu, Baohai Jia, Juan Cui, Ran He, Jinghan Wang, Yiyuan Luo, Kornelius Nielsch, Jiaqing He
Summary: This work focuses on the characterization and controllability of gap-like structures in GeTe-rich Sb2Te3(GeTe)(n) samples, and demonstrates their significant impact on thermal transport and thermoelectric performance. By tailoring the microstructure, the researchers achieved a considerable reduction in lattice thermal conductivity, resulting in high ZT values and improved efficiency. Additionally, a thermoelectric module fabricated using the improved material achieved exceptional power density and efficiency, showcasing the potential of this strategy in improving thermoelectric performance.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Chemistry, Physical
A. R. Gilev, E. A. Kiselev, D. A. Malyshkin, K. S. Sukhanov, V. A. Cherepanov
Summary: The effect of air humidity on the transport properties of La(2-x)A(x)Ni(1-y)Fe(y)O(4)(+delta) oxides was studied, showing that the total conductivity decreased with increasing relative humidity, attributed to the hydration of the samples. The hydration affected the surface exchange process in LSNF0605, and water could participate in the surface exchange, suggesting the presence of proton conduction.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Inorganic & Nuclear
A. V. Bryuzgina, A. S. Urusova, V. A. Cherepanov
Summary: The phase diagram of the 1/zY(2)O(3)-1/zFe(2)O(3)-CoOx system has been experimentally studied and constructed in air at 1373 K. The stability boundaries of YFe1-xCoxO3 oxides with respect to Po-2 have been estimated for various temperatures within the range of 1173-1573 K. The results show that the limiting composition of the YFe1-xCoxO3 solid solution at 1373 K decreases linearly with decreasing x, reaching x=0 when the decomposition pressure of YFeO3 is equal to lg(Po-2/atm)=-13.3.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Materials Science, Ceramics
Tatiana Aksenova, Nadezhda E. Volkova, Antoine Maignan, Vladimir A. Cherepanov
Summary: The phase equilibria in the 1/2Nd(2)O(3)-BaO-1/2Fe(2)O(3) system were studied, and the crystal structure and oxygen content of different intermediate oxides were determined. The substitution of neodymium by barium was found to decrease the oxygen content and influence the thermal properties.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Electrochemistry
A. R. Gilev, E. A. Kiselev, K. S. Sukhanov, D. V. Korona, V. A. Cherepanov
Summary: La2NiO4+delta, LCNF0604, LSNF0604, LSNF0605 and LSNF0504 compounds were synthesized by the citrate-nitrate technique and their phase purity was confirmed by X-ray powder diffraction. Electrochemical impedance spectroscopy studies showed that the polarization resistance decreased in the temperature range of 600-800 degrees C in wet air, with the order of LCNF0604>La2NiO4+delta>LSNF0504>LSNF0604>LSNF0605. The low frequency process was found to contribute significantly to the polarization resistance of the studied cells.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Inorganic & Nuclear
I. B. Golovachev, A. A. Trushnikov, N. E. Volkova, T. V. Aksenova, V. A. Cherepanov
Summary: The crystal structure and oxygen content of Ba(0.9)Ln(0.1)Fe(1 - y)Co(y)O(3 - delta) solid solutions were studied under different conditions. The unit cell parameter of the solid solutions increases with higher cobalt content or rare-earth atomic radius, while the oxygen content and mean oxidation state of metal ions decrease.
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
A. R. Gilev, E. A. Kiselev, M. E. Ozhiganov, V. A. Cherepanov
Summary: The polarization resistance of the studied electrodes increases with the number of perovskite layers, indicating slower ionic transport and increased oxygen dissociation.
SOLID STATE IONICS
(2022)
Article
Chemistry, Physical
Tatiana Aksenova, Darya K. Mysik, Vladimir A. Cherepanov
Summary: This study prepared a series of Gd1-xSrxCo1-yFeyO3-delta samples using a glycerol nitrate technique and investigated their structural and electrical properties. X-ray diffraction analysis revealed different crystal structures within different composition ranges, and thermogravimetric analysis was used to study the variation of oxygen content with temperature. Furthermore, measurements of relevant properties showed that Gd0.2Sr0.8Co0.3Fe0.7O3-delta exhibited the highest conductivity and predominantly p-type conductivity.
Article
Materials Science, Ceramics
K. S. Tolstov, N. E. Volkova, A. Yu Suntsov, I. L. Ivanov, L. Ya Gavrilova, V. A. Cherepanov
Summary: Anion-deficient perovskite-like Ba3SmFe2O7.5 was synthesized via a glycerol-nitrate method. High-temperature X-ray diffraction revealed a crystal structure transition temperature range of 800 and 840 ? and was confirmed by dilatometric analysis. The thermal expansion coefficient of Ba3SmFe2O7.5 was determined to be approximately 12.8 x 10(-6) K-1 between 25 ? and 800 ?. Magnetic experiments showed the high phase purity of the oxide and the presence of Fe3+ ions in high and intermediate spin states with a ratio of 75% and 25%, respectively.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Inorganic & Nuclear
A. V. Bryuzgina, A. S. Urusova, V. A. Cherepanov
Summary: A systematic study of the Y2O3 - BaO - Fe2O3 system near YBa2Fe3O8+8 reveals that the actual composition of the 123-type oxide differs from the ideal one. Single-phase oxide with a 123-type structure can be obtained at 1373 K in air only with a slight deficit of Ba and an excess of both Y and Fe components. The revised phase diagram for the Y2O3 - BaO - Fe2O3 system is constructed at 1373 K in air, including the composition of a previously unreported complex oxide.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
I. A. Bastron, N. E. Volkova, A. Yu. Suntsov, V. A. Cherepanov
Summary: An excess of Dy in A-site was found to enable the synthesis of a single-phase perovskite-related oxide with the 123-type structure at 1100 degrees C in air. Cobalt ions fill the octahedrally coordinated positions, while iron and excess cobalt occupy pyramidal oxygen coordination. The oxygen content decreases with temperature, and a slight increase in thermal expansion slope is observed at temperatures above 200 degrees C. The electrical conductivity increases with temperature, reaching a maximum value at 900 degrees C. Magnetic measurements suggest the spin states of Fe3+ and Co2+, while Co3+ can have multiple states depending on coordination.
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
(2023)
Article
Chemistry, Physical
Artem R. Gilev, Evgeny A. Kiselev, Maksim E. Ozhiganov, Vladimir A. Cherepanov
Summary: This study analyzes the surface oxygen exchange in La2NiO4+a and La1.5Sr0.5Ni1-yFeyO4+a (y=0.3, 0.4) oxides. The results show that surface limitations occur in La2NiO4+a when the P(O2) gradient increases, and surface exchange plays a predominant role in the overall oxygen flux. The surface limitations in La2NiO4+a are attributed to a faster decrease in oxygen excess and Ni3+ concentration compared to La1.5Sr0.5Ni0.7Fe0.3O4+a and La1.5Sr0.5Ni0.6Fe0.4O4+a.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
T. V. Aksenova, N. E. Volkova, V. S. Legonkova, V. A. Cherepanov
Summary: The homogeneity ranges and crystal structure of solid solutions with different compositions of Nd1-xBaxCo1-yFeyO3-delta were determined. Depending on the concentration of barium, the oxide can crystallize in different structures. The relationship between unit cell parameters and composition of the solid solutions was obtained. It was observed that the oxygen nonstoichiometry increased with the increase of barium and cobalt content.
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Materials Science, Multidisciplinary
A. S. Abramov, V. A. Safina, D. O. Alikin, D. Karpinsky, D. Zhaludkevich, V. Pryakhina, E. A. Kiselev, V. N. Shut, A. L. Zhaludkevich, V. Ya Shur, A. L. Kholkin
Summary: The morphotropic phase boundary (MPB) region of the BFO-BTO solid solution is investigated using comprehensive macroscopic and local methods, focusing on the synthesis conditions that affect the final phase composition and functional response. The difference in phase distribution and local switching behavior in two sets of BFO-BTO solid solutions prepared with different applied pressures is attributed to local chemical inhomogeneity caused by variations in solid-state sintering reactions. The more uniform mixing of polar and non-polar phases promotes the non-polar-to-polar phase transition and widens the MPB region.
