In this study,compositionally complex cobaltites with the general formula BaLnCo_(2)O_(6−δ)with three to eight different lanthan-ides at the Ln-site were synthesized using the solid-state reaction method and studied....In this study,compositionally complex cobaltites with the general formula BaLnCo_(2)O_(6−δ)with three to eight different lanthan-ides at the Ln-site were synthesized using the solid-state reaction method and studied.Analysis of entropy metrics and configurational en-tropy calculations indicated that these compounds are medium entropy oxides.All of these crystallize as tetragonal double perovskites from the space group P4/mmm.The unit cell parameters are controlled by the average ionic radius,not the configurational entropy.On the other hand,the oxygen non-stoichiometry is consistently higher than in the case of low entropy double perovskite cobaltites.The total electrical conductivity of all materials in studied conditions is well above 50 S/cm,peaking at 1487 S/cm for BaLa_(1/3)Nd_(1/3)Gd_(1/3)Co_(2)O_(6−δ)at 300℃.The electrical conductivity decreases with the number of substituents.展开更多
Solid oxide fuel cells based on doped cefia electrolytes offer operating temperatures of -600℃. During recent years much atten- tion was aimed at successful powder preparation with high sinter activity and high condu...Solid oxide fuel cells based on doped cefia electrolytes offer operating temperatures of -600℃. During recent years much atten- tion was aimed at successful powder preparation with high sinter activity and high conductivity. The properties of ceria electrolyte are very sensitive to impurities introduced during powder and electrolyte fabrication. One of the most successful and commercially available processes for the production of clean powders is based on the addition of several percent metallic cations that will react with impurities and segregate into the triple points of grain boundaries. In this work the results obtained from doping of CGO20 by 2% Ca and prepared by different routes were presented. The way of introducing Ca seemed to play an important role.展开更多
Carbon soot containing fullerene was continuously produced in volume by pyrolyzing acetylene in thermal HF-Plasma. The characteristics of the carbon soot and C60 were analyzed by thtransmission electron microscopy, UV...Carbon soot containing fullerene was continuously produced in volume by pyrolyzing acetylene in thermal HF-Plasma. The characteristics of the carbon soot and C60 were analyzed by thtransmission electron microscopy, UV/visible, IR and Raman spectroscopy. The results show that the main ingredients of the carbon soot with size of about 25 nm are amorphous carbon, graphite and fullerene. The fullerene yield in carbon soot is about 2.5 g·h^-1. Compared with the graphite arc discharge method, the acetylene thermal plasma method is a preferential one for synthesis of fullerene.展开更多
Zero-crossing of a derivative of Gaussian filter is a well-known edge location criterion. Examples are the Laplacian, the second derivative in the gradient direction (SDGD) and the sum of the Laplacian and SDGD (PLUS)...Zero-crossing of a derivative of Gaussian filter is a well-known edge location criterion. Examples are the Laplacian, the second derivative in the gradient direction (SDGD) and the sum of the Laplacian and SDGD (PLUS). Derivative operators can easily be implemented by convoluting the primitive image with a derivative of a Gaussian. Gaussian filter displaces the equipotential of half height inwards for convex edge and outwards for concave edges. A Difference-of-Gaussian (DoG) filter is similar to the Laplacian-of-Gaussian but with opposite sign and causes a convex edge shift inwards. This paper introduces the Multiple-of-Gaussian niters to reduce curvature-based location error. Using a linear combination of N Gaussians(N】2) with proper weights, the edge shifts can be reduced to 1/(2N-3) of the ones produced by a similar Laplacian-of-Gaussian filter.展开更多
Ordered titanium dioxide nanotubes （TiOaNTs） modified with indium tin oxide （ITO） films were obtained via magnetron sputtering, in which ITO plate was used as a target, onto the as-anodized titania support followe...Ordered titanium dioxide nanotubes （TiOaNTs） modified with indium tin oxide （ITO） films were obtained via magnetron sputtering, in which ITO plate was used as a target, onto the as-anodized titania support followed by the calcination process. The morphology of fabricated material with deposited oxide was investigated using scanning electron microscopy. Raman and UV-Vis spectroscopies were utilized to characterize crystalline phase and optical properties of prepared samples, whereas X-ray photoelectron spectroscopy allowed determining the binding energy of present elements. In the case of titanium, three various oxidation states were identified and also the presence of indium and tin was confirmed. The electrochemical test carried out when the sample was exposed to light allows for selection of the most photoactive material. The highest photocurrent was registered when only 5-nm ITO layer was sputtered, and it equals 256 and 133 μA cm^-2 for the electrode material immersed in 0.5 M KOH and K2SO4 electrolytes, respectively, that is accordingly 3.5 and 4.4 times higher than the one observed for pristine titania. Furthermore, ITO-modified titania exhibits excellent photostability upon prolonged illumination that is of key importance for possible application in light-driven processes.展开更多
This study proposes a novel and sustainable method for fabricating 3D-printed carbon-based electrodes for electrochemical wastewater treatment.We prepared B,N-doped carbon electrodes with hierarchical porosity and a s...This study proposes a novel and sustainable method for fabricating 3D-printed carbon-based electrodes for electrochemical wastewater treatment.We prepared B,N-doped carbon electrodes with hierarchical porosity and a significantly enhanced surface area-to-volume ratio(up to 180%)compared to non-optimized analogues using a synergistic combination of 3D printing,phase inversion,and microwave plasma-enhanced chemical vapor deposition.This process allows the metal-free growth of vertically aligned carbon nanostructures directly onto polymer-derived substrates,resulting in a 20-fold increase in the electrochemically active surface area.Computational fluid dynamics simulations were used to improve mass transport and reduce pressure drop.Electrochemical characterization demonstrated that the optimized electrodes performed significantly better,achieving 4.7-,4-,and 6.5-fold increases in the degradation rates of atenolol,metoprolol,and propranolol,respectively,during electrochemical oxidation.These results highlight the efficacy of the integrated fabrication and simulation approach in producing high-performance electrodes for sustainable wastewater treatment applications.展开更多
Non-centrosymmetric superconducting materials represent an exciting class of novel superconductors featuring a variety of unconventional properties,including mixed-parity pairing and very high upper critical fields.He...Non-centrosymmetric superconducting materials represent an exciting class of novel superconductors featuring a variety of unconventional properties,including mixed-parity pairing and very high upper critical fields.Here,we present a comprehensive study of TaIr_(2)B_(2)(with T_(c)=5.1 K),using a set of complementary experimental methods,including bulk-and surface-sensitive techniques.We provide evidence that this system is a two-band,yet it behaves as a single-gap superconductor with a strong coupling.The upper critical field of TaIr_(2)B_(2)significantly exceeds the Pauli limit and exhibits a nearly linear temperature dependence down to the lowest temperatures.This behavior,rarely seen in superconductors,is discussed in terms of anti-symmetric spin-orbit interaction,two-band-,and strong-coupling effects,as well as disorder.展开更多
基金support of these studies from Gdańsk University of Technology by the DEC-3/2/IDUB/Ⅲ.1a/Ra/2023 and DEC-1/1/2024/IDUB/Ⅲ.4c/Tc grants under the Radium and Technetium-‘Excellence Initiative-Research University’programs.
文摘In this study,compositionally complex cobaltites with the general formula BaLnCo_(2)O_(6−δ)with three to eight different lanthan-ides at the Ln-site were synthesized using the solid-state reaction method and studied.Analysis of entropy metrics and configurational en-tropy calculations indicated that these compounds are medium entropy oxides.All of these crystallize as tetragonal double perovskites from the space group P4/mmm.The unit cell parameters are controlled by the average ionic radius,not the configurational entropy.On the other hand,the oxygen non-stoichiometry is consistently higher than in the case of low entropy double perovskite cobaltites.The total electrical conductivity of all materials in studied conditions is well above 50 S/cm,peaking at 1487 S/cm for BaLa_(1/3)Nd_(1/3)Gd_(1/3)Co_(2)O_(6−δ)at 300℃.The electrical conductivity decreases with the number of substituents.
文摘Solid oxide fuel cells based on doped cefia electrolytes offer operating temperatures of -600℃. During recent years much atten- tion was aimed at successful powder preparation with high sinter activity and high conductivity. The properties of ceria electrolyte are very sensitive to impurities introduced during powder and electrolyte fabrication. One of the most successful and commercially available processes for the production of clean powders is based on the addition of several percent metallic cations that will react with impurities and segregate into the triple points of grain boundaries. In this work the results obtained from doping of CGO20 by 2% Ca and prepared by different routes were presented. The way of introducing Ca seemed to play an important role.
基金Funded by the National Natural Science Foundation of China (No.50372013) the Guangdong Province Natural Science Foundation of China(No.004009487, No.04300168).
文摘Carbon soot containing fullerene was continuously produced in volume by pyrolyzing acetylene in thermal HF-Plasma. The characteristics of the carbon soot and C60 were analyzed by thtransmission electron microscopy, UV/visible, IR and Raman spectroscopy. The results show that the main ingredients of the carbon soot with size of about 25 nm are amorphous carbon, graphite and fullerene. The fullerene yield in carbon soot is about 2.5 g·h^-1. Compared with the graphite arc discharge method, the acetylene thermal plasma method is a preferential one for synthesis of fullerene.
文摘Zero-crossing of a derivative of Gaussian filter is a well-known edge location criterion. Examples are the Laplacian, the second derivative in the gradient direction (SDGD) and the sum of the Laplacian and SDGD (PLUS). Derivative operators can easily be implemented by convoluting the primitive image with a derivative of a Gaussian. Gaussian filter displaces the equipotential of half height inwards for convex edge and outwards for concave edges. A Difference-of-Gaussian (DoG) filter is similar to the Laplacian-of-Gaussian but with opposite sign and causes a convex edge shift inwards. This paper introduces the Multiple-of-Gaussian niters to reduce curvature-based location error. Using a linear combination of N Gaussians(N】2) with proper weights, the edge shifts can be reduced to 1/(2N-3) of the ones produced by a similar Laplacian-of-Gaussian filter.
基金financially supported by the Polish National Science Centre:Grant No.2012/07/D/ST5/02269supported by the Foundation for Polish Science (FNP)+1 种基金the financial support from Polish National Science Centre under Grant No.2015/17/D/ ST5/02571the financial support from Polish National Science Centre under Grant No.2016/23/N/ST5/02071
文摘Ordered titanium dioxide nanotubes （TiOaNTs） modified with indium tin oxide （ITO） films were obtained via magnetron sputtering, in which ITO plate was used as a target, onto the as-anodized titania support followed by the calcination process. The morphology of fabricated material with deposited oxide was investigated using scanning electron microscopy. Raman and UV-Vis spectroscopies were utilized to characterize crystalline phase and optical properties of prepared samples, whereas X-ray photoelectron spectroscopy allowed determining the binding energy of present elements. In the case of titanium, three various oxidation states were identified and also the presence of indium and tin was confirmed. The electrochemical test carried out when the sample was exposed to light allows for selection of the most photoactive material. The highest photocurrent was registered when only 5-nm ITO layer was sputtered, and it equals 256 and 133 μA cm^-2 for the electrode material immersed in 0.5 M KOH and K2SO4 electrolytes, respectively, that is accordingly 3.5 and 4.4 times higher than the one observed for pristine titania. Furthermore, ITO-modified titania exhibits excellent photostability upon prolonged illumination that is of key importance for possible application in light-driven processes.
基金the National Science Centre,Poland,under the Agreement 2022/45/B/ST8/02847 is acknowledged(M.P.).
文摘This study proposes a novel and sustainable method for fabricating 3D-printed carbon-based electrodes for electrochemical wastewater treatment.We prepared B,N-doped carbon electrodes with hierarchical porosity and a significantly enhanced surface area-to-volume ratio(up to 180%)compared to non-optimized analogues using a synergistic combination of 3D printing,phase inversion,and microwave plasma-enhanced chemical vapor deposition.This process allows the metal-free growth of vertically aligned carbon nanostructures directly onto polymer-derived substrates,resulting in a 20-fold increase in the electrochemically active surface area.Computational fluid dynamics simulations were used to improve mass transport and reduce pressure drop.Electrochemical characterization demonstrated that the optimized electrodes performed significantly better,achieving 4.7-,4-,and 6.5-fold increases in the degradation rates of atenolol,metoprolol,and propranolol,respectively,during electrochemical oxidation.These results highlight the efficacy of the integrated fabrication and simulation approach in producing high-performance electrodes for sustainable wastewater treatment applications.
基金supported by the National Science Center(Poland),Grant No.2022/45/B/ST5/03916The work at Slovak Academy of Sciences was supported by Projects APVV-23-0624,VEGA 2/0073/24,COST Action No.CA21144(SUPERQUMAP),Slovak Academy of Sciences Project IMPULZ IM-2021-42.
文摘Non-centrosymmetric superconducting materials represent an exciting class of novel superconductors featuring a variety of unconventional properties,including mixed-parity pairing and very high upper critical fields.Here,we present a comprehensive study of TaIr_(2)B_(2)(with T_(c)=5.1 K),using a set of complementary experimental methods,including bulk-and surface-sensitive techniques.We provide evidence that this system is a two-band,yet it behaves as a single-gap superconductor with a strong coupling.The upper critical field of TaIr_(2)B_(2)significantly exceeds the Pauli limit and exhibits a nearly linear temperature dependence down to the lowest temperatures.This behavior,rarely seen in superconductors,is discussed in terms of anti-symmetric spin-orbit interaction,two-band-,and strong-coupling effects,as well as disorder.
