المؤلفون: Jingtao Xu, Shi-Xin Lin, Guoqiang Liu, Qingsong Wu, Xiaojian Tan, Jun Jiang, Hezhu Shao, Wen-Hua Zhang

المصدر: The Journal of Physical Chemistry C. 123:15996-16002

مصطلحات موضوعية: Materials science, Condensed matter physics, Electron phonon coupling, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Thermoelectric materials, 01 natural sciences, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Lattice thermal conductivity, General Energy, Thermal conductivity, Physical and Theoretical Chemistry, 0210 nano-technology

الوصف: SnTe has been regarded as an environment-friendly alternative of PbTe thermoelectrics, although its performance is limited by its high thermal conductivity, partly owing to its high carrier concent...

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::be27a6f8ee250b091969b95d6faf0da4Test
https://doi.org/10.1021/acs.jpcc.9b03329Test

المؤلفون: Guoqiang Liu, Sichen Duan, Jingtao Xu, Xin-Xin Yang, Na Man, Kai Guo, Jun Jiang, Hezhu Shao, Qingsong Wu, Xiaojian Tan

المصدر: Journal of Materials Chemistry A. 7:9241-9246

مصطلحات موضوعية: Materials science, Thermoelectric cooling, Renewable Energy, Sustainability and the Environment, Modulus, 02 engineering and technology, General Chemistry, 021001 nanoscience & nanotechnology, Thermoelectric materials, Moderate temperature, Lattice thermal conductivity, Thermoelectric effect, Vickers hardness test, General Materials Science, Composite material, 0210 nano-technology

الوصف: (Bi,Sb)2Te3 alloys have been widely used in thermoelectric cooling, but their poor mechanical properties limit the module size to reach higher cooling density. Here, we report the thermoelectric and mechanical properties of (Bi,Sb)2Te3–Ge0.5Mn0.5Te composites; Ge0.5Mn0.5Te has recently been reported to be a promising thermoelectric material with high hardness in a moderate temperature range. Alloying with Ge0.5Mn0.5Te not only reduces the lattice thermal conductivity, but also improves the mechanical properties. Along with carrier concentration regulation, both excellent thermoelectric and mechanical properties have been achieved in (Bi,Sb)2Te3–Ge0.5Mn0.5Te composites. The Vickers hardness increased from 0.45 Gpa for the pristine (Bi,Sb)2Te3 to 0.81 Gpa for the sample with 1.0% Ge0.5Mn0.5Te, and a Young's modulus of 37.06 Gpa was obtained for the one with 1% Ge0.5Mn0.5Te. By adjusting the carrier concentration, the final ZT value of (Bi,Sb)2Te3 > 1.1 at 350 K.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::2d556ee0e95a9ed96251f2f8acd212dbTest
https://doi.org/10.1039/c9ta01962fTest

المؤلفون: Haoyang Hu, Jingtao Xu, Jun Jiang, Jianfeng Zhang, Min Jin, Hezhu Shao, Guoqiang Liu, Qingsong Wu, Xiaojian Tan, Miaomiao Li, Huajie Huang

المصدر: Journal of Materiomics, Vol 4, Iss 4, Pp 321-328 (2018)

مصطلحات موضوعية: Materials science, Condensed matter physics, Band gap, Metals and Alloys, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Thermoelectric materials, Microstructure, 01 natural sciences, Grain size, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Thermal conductivity, Lattice constant, Thermoelectric effect, lcsh:TA401-492, lcsh:Materials of engineering and construction. Mechanics of materials, 0210 nano-technology, Solid solution

الوصف: Recently, SnSe has attracted wide attention as a promising environment-friendly IV-VI thermoelectric material. Here, SnS is alloyed with Na-doped SnSe to decrease the thermal conductivity for better thermoelectric performance. Consistent with previous reports, the lattice constant and the band gap change linearly with increasing SnS, suggesting the formation of SnSe1-xSx solid solution. However, SnS nano-precipitations have been clearly observed, indicating the phase separation in the alloys. Moreover, the grain size decreases obviously with increasing SnS amount. The first-principles calculations show that the nano-precipitation is due to the positive formation energies for SnSe1-xSx in the small x region. Due to the structure engineering, the lattice thermal conductivity is greatly reduced in SnSe1-xSx samples, leading to a promising ZT of 1.35 for Na0.03Sn0.97Se0.7S0.3 at 816 K. Keywords: SnSe, Solid solution, Grain refinement, Thermal conductivity, Thermoelectric performance

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4c3ab75e236160568f5b12ec3f788da1Test
https://doi.org/10.1016/j.jmat.2018.09.001Test

المؤلفون: Yufei Jiang, Lijun Yang, Zheng Hu, Qingsong Wu, Xiao Du, Renchao Che, Ou Zhuo, Xiali Zhang, Kun Mao, Xizhang Wang, Hao Fan, Qiang Wu, Tao Sun, Jin Zhao, Meng Liu

المصدر: Journal of Materials Chemistry A. 6:21313-21319

مصطلحات موضوعية: Materials science, Renewable Energy, Sustainability and the Environment, Limiting current, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrocatalyst, 01 natural sciences, 0104 chemical sciences, Nanocages, Chemical engineering, Nanocrystal, Carbothermic reaction, Scanning transmission electron microscopy, Nano, Reversible hydrogen electrode, General Materials Science, 0210 nano-technology

الوصف: Nowadays the main challenge for large-scale applications of fuel cells is the designing of cheap and stable electrocatalysts for the oxygen reduction reaction (ORR). Herein, we report a convenient approach to a highly active cheap ORR electrocatalyst by tailoring the nano heterointerface of α-Fe2O3/Fe3O4 on hierarchical nitrogen-doped carbon nanocages (hNCNC) via the partial carbothermal reduction of α-Fe2O3 nanocrystals to Fe3O4. The so-constructed heterostructural α-Fe2O3/Fe3O4/hNCNC electrocatalyst exhibits excellent ORR performance surpassing commercial Pt/C, with a high onset potential (1.03 V vs. reversible hydrogen electrode) and half-wave potential (0.838 V), large limiting current density (6.02 mA cm−2 at 0.5 V), and robust durability and methanol tolerance. The heterostructure is identified by high-angle annular dark field scanning transmission electron microscopy coupled with electron energy-loss spectroscopy. Acid leaching experiments and theoretical calculations indicate that the heterostructural α-Fe2O3/Fe3O4 species with variable Fe valences are responsible for the high ORR performance. In principle, regulating the nano heterointerface based on the multivalent metal species in a nanocrystal matrix could become a new convenient approach to developing high-performance electrocatalysts or even various functional materials.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::f080a7a99310b27be4465799f3a3ba8bTest
https://doi.org/10.1039/c8ta06442cTest

المؤلفون: Renchao Che, Qingsong Wu, Yu Wang, Lijun Yang, Xizhang Wang, Xiali Zhang, Qiang Wu, Hao Fan, Zheng Hu, Meng Liu

المصدر: Science Bulletin. 62:1365-1372

مصطلحات موضوعية: Multidisciplinary, Materials science, Spinel, Inorganic chemistry, Nanoparticle, 02 engineering and technology, engineering.material, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Cathode, 0104 chemical sciences, Catalysis, law.invention, Metal, Nanocages, X-ray photoelectron spectroscopy, law, visual_art, visual_art.visual_art_medium, engineering, Reversible hydrogen electrode, 0210 nano-technology

الوصف: The unique hierarchical nitrogen-doped carbon nanocages (hNCNC) are used as a new support to homogeneously immobilize spinel CoFe2O4 nanoparticles by a facile solvothermal method. The so-constructed hierarchical CoFe2O4/hNCNC catalyst exhibits a high oxygen reduction activity with an onset potential of 0.966 V and half-wave potential of 0.819 V versus reversible hydrogen electrode, far superior to the corresponding 0.846 and 0.742 V for its counterpart of CoFe2O4/hCNC with undoped hierarchical carbon nanocages (hCNC) as the support, which locates at the top level for spinel-based catalysts to date. Consequently, the CoFe2O4/hNCNC displays the superior performance to the CoFe2O4/hCNC, when used as the cathode catalysts in the home-made Al-air batteries. X-ray photoelectron spectroscopy characterizations reveal the more charge transfer from CoFe2O4 to hNCNC than to hCNC, indicating the stronger interaction between CoFe2O4 and hNCNC due to the nitrogen participation. The enhanced interaction and hierarchical morphology favor the high dispersion and modification of electronic states for the active species as well as the mass transport during the oxygen reduction process, which plays a significant role in boosting the electrocatalytic performances. In addition, we noticed the high sensitivity of O 1s spectrum to the particle size and chemical environment for spinel oxides, which is used as an indicator to understand the evolution of ORR activities for all the CoFe2O4-related contrast catalysts. Accordingly, the well-defined structure-performance relationship is demonstrated by the combination of experimental characterizations with theoretical calculations. This study provides a promising strategy to develop efficient, inexpensive and durable oxygen reduction electrocatalysts by tuning the interaction between spinel metal oxides and the carbon-based supports.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::efa6c160e66db8f2be8244ae75d062a8Test
https://doi.org/10.1016/j.scib.2017.10.001Test

المؤلفون: Jingtao Xu, Yukun Xiao, Kai Guo, Hongxiang Wang, Guoqiang Liu, Xin-Xin Yang, Jun Jiang, Qingsong Wu, Xiaojian Tan, Haoyang Hu, Sichen Duan, Yinong Yin, Qiang Zhang, Na Man

المصدر: Nano Energy. 78:105232

مصطلحات موضوعية: Materials science, Condensed matter physics, Renewable Energy, Sustainability and the Environment, Band gap, business.industry, 02 engineering and technology, Spin–orbit interaction, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Lattice constant, Semiconductor, Electrical resistivity and conductivity, Seebeck coefficient, Thermoelectric effect, General Materials Science, Electrical and Electronic Engineering, 0210 nano-technology, Relativistic quantum chemistry, business

الوصف: The thermoelectric performance of a semiconductor is intrinsically limited by the coupling of the transport factors, originating in the mechanism of band gap opening. Here we report the anomalous semiconductor AgSbSe2-alloyed PbSe, in which the spin-orbit coupling (SOC) induced band gap allows the decoupling of electrical conductivity and Seebeck coefficient. In such a SOC semiconductor, the decrease of lattice constant increases the band gap from 0.23 eV up to 0.5 eV, seemingly in contrast to the previously measured negative pressure coefficient of band gap. Very different thermoelectric behaviors from the pristine PbSe were observed in PbSe–AgSbSe2, and finally a high peak ZT of 1.65 at 858 K and a remarkable average ZT (300–858 K) of 0.86 were obtained. This study reveals the novel relativistic effects in PbSe–AgSbSe2 system, and its thermoelectric performance is believed to have a large potential to be further improved.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::65f6e72efd9c263bd455774cc1631085Test
https://doi.org/10.1016/j.nanoen.2020.105232Test

المؤلفون: Yukun Xiao, Qiang Zhang, Jingtao Xu, Lisha Mao, Yinong Yin, Haoyang Hu, Jun Jiang, Zhe Guo, Qingsong Wu, Xiaojian Tan, Chang Tan, Guoqiang Liu

المصدر: Chemical Engineering Journal. 390:124585

مصطلحات موضوعية: Materials science, Condensed matter physics, Phonon scattering, General Chemical Engineering, 02 engineering and technology, General Chemistry, Atmospheric temperature range, 010402 general chemistry, 021001 nanoscience & nanotechnology, Thermoelectric materials, 01 natural sciences, Industrial and Manufacturing Engineering, 0104 chemical sciences, Effective mass (solid-state physics), Thermal conductivity, Seebeck coefficient, Thermoelectric effect, Density of states, Environmental Chemistry, 0210 nano-technology

الوصف: SnTe is an emerging lead-free IV–VI thermoelectric compound, but the high hole concentration, low Seebeck coefficient and high thermal conductivity limit its thermoelectric performance. In this work, we investigated the effect of n-type AgBiSe2 alloying on the electronic and thermal transport of SnTe, which had not been explored before. It was found that the introduction of AgBiSe2 reduced the hole concentration significantly, and improved the Seebeck coefficient in a wide temperature range. The density functional theory calculations confirmed that AgBiSe2 alloying led to a moderate band convergence and an increase in density of state effective mass. The AgBiSe2 alloying also decreased the lattice thermal conductivity due to the enhanced phonon scattering by point defect and nanoscale precipitates. Consequently, these multiple effects synergistically yielded a maximum ZT of 1.02 at 860 K, making SnTe-AgBiSe2 a promising thermoelectric material.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::4d5d6c374d6b681adb8809cc17978b95Test
https://doi.org/10.1016/j.cej.2020.124585Test

المؤلفون: Mengxiong Li, Xiao Chi, Zhongxin Chen, Lei Dong, Caozheng Diao, Nanchen Dongfang, Long Zhang, Kian Ping Loh, Hongbin Lu, Qingsong Wu, Zedong Zhao, Renchao Che, Peilu Jiang

المصدر: Advanced Energy Materials. 8:1870152

مصطلحات موضوعية: Materials science, Renewable Energy, Sustainability and the Environment, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Nickel, chemistry.chemical_compound, chemistry, Chemical engineering, Hydroxide, General Materials Science, 0210 nano-technology, Cobalt, Chemical adsorption

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::9cd5b9f56d1d538d49e8c33313bd3414Test
https://doi.org/10.1002/aenm.201870152Test

المؤلفون: Zhongxin Chen, Xiao Chi, Kian Ping Loh, Lei Dong, Caozheng Diao, Zedong Zhao, Qingsong Wu, Renchao Che, Long Zhang, Nanchen Dongfang, Peilu Jiang, Hongbin Lu, Mengxiong Li

المصدر: Advanced Energy Materials. 8:1802431

مصطلحات موضوعية: Materials science, Renewable Energy, Sustainability and the Environment, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, Nickel, chemistry, Chemical engineering, Hydroxide, General Materials Science, 0210 nano-technology, Cobalt, Chemical adsorption

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::42cad0dae834c553657dcc6dabc181f7Test
https://doi.org/10.1002/aenm.201802431Test