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147 results on '"Hao, LuYuan"'

34. Electrocatalytic Self‐Supported‐Electrode Based on CoxNi1‐xP/TiC0.5N0.5 for Enhancing pH‐Universal Hydrogen Evolution Electrocatalysis.

Author

Shao, Haojie, Wu, Yutong, Xu, Xin, Xian, Yuxi, Shi, Yangyang, Wang, Feihong, Lv, Kai, Tan, Chuntian, Hao, Luyuan, Dong, Binbin, and Agathopoulos, Simeon

Subjects
HYDROGEN evolution reactions, ELECTROCATALYSIS, DENSITY functional theory, POROSITY, HYDROGEN, CORROSION resistance
Abstract

The industrial application of powder‐based catalytic electrodes is heavily restricted by powder shedding, inhibition of active sites, and poor long‐term stability. Herein, a porous titanium carbonitride (TiC0.5N0.5) ceramic substrate with open straight finger‐like holes is first made by a simple approach of phase‐inversion tape‐casting and pressureless sintering, and then a CoxNi1‐xP active layer is in situ formed by a hydrothermal technique and phosphorization to achieve integrated CoxNi1‐xP/TiC0.5N0.5 self‐supported ceramic electrodes. Electrochemical tests reveal that the optimized Co0.9Ni0.1P/TiC0.5N0.5 electrode exhibits overpotentials of 76.5 and 79.8 mV at 10 mA cm−2, Tafel slopes of 47.3 and 40.5 mV dec−1, in 0.5 m H2SO4 and 1 m KOH, respectively. Furthermore, its superior long‐term stability and resistance to corrosion can be achieved for more than 20 h in both media at 100 mA cm−2. In addition, the Co0.9Ni0.1P/TiC0.5N0.5 electrode has much better performance than Pt/C at high current density in neutral media. Density functional theory calculations confirm that the Ni substitution of 1/10 Co in CoP leads to the more optimal |ΔGH*| among the CoxNi1‐xP catalysts. Compared with other CoP or NiP‐based electrodes, the Co0.9Ni0.1P/TiC0.5N0.5 electrode benefits from high strength, unique pore structure, tight and compatible bonding, and high hydrophilicity. [ABSTRACT FROM AUTHOR]

Published
2022
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37. Hard SiOC Microbeads as a High-Performance Lithium-Ion Battery Anode

Author

Dong, Binbin, primary, Han, Yehu, additional, Wang, Ting, additional, Lei, Zhanwu, additional, Chen, Yawei, additional, Wang, Feihong, additional, Abadikhah, Hamidreza, additional, Khan, Sayed Ali, additional, Hao, Luyuan, additional, Xu, Xin, additional, Cao, Ruiguo, additional, Yin, Liangjun, additional, and Agathopoulos, Simeon, additional

Published
2020
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40. Self-supported porous heterostructure WC/WO3−xceramic electrode for hydrogen evolution reaction in acidic and alkaline media

Author

Wang, Feihong, Dong, Binbin, Wang, Junwei, Ke, Nianwang, Tan, Chuntian, Huang, Anding, Wu, Yutong, Hao, Luyuan, Yin, Liangjun, Xu, Xin, Xian, Yuxi, and Agathopoulos, Simeon

Abstract

Tungsten carbide (WC)-based materials are widely considered as the hydrogen evolution reaction (HER) process catalysts due to their “Pt-like” electronic structure. Nonetheless, traditional powder electrodes have a high cost, and display problems related to the process itself and the poor stability over operation time. This paper presented a self-supported asymmetric porous ceramic electrode with WO3−xwhiskers formed in situon the walls of the finger-like holes and membrane surface, which was prepared by combining phase inversion tape-casting, pressureless sintering, and thermal treatment in a CO2atmosphere. The optimized ceramic electrode displayed good catalytic HER activity and outstanding stability at high current densities. More specifically, it demonstrated the lowest overpotentials of 107 and 123 mV and the lowest Tafel slopes of 59.3 and 72.4 mV·dec−1at 10 mA·cm−2in acidic and alkaline media, respectively. This superior performance was ascribed to the structure of the ceramic membrane and the charge transfer efficiency, which was favored by the in situdeveloped WC/WO3−xheterostructure and the oxygen vacancies.

Published
2022
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45. Mechanism of upconversion luminescence enhancement in Yb3+/Er3+ co-doped Y2O3 through Li+ incorporation.

Author

Yang, Xiongfeng, Liu, Min, Liu, Jiandang, Xia, Yuanhua, Ji, Weiwei, Li, Zhiang, Chen, Jifang, Liu, Liu, Hao, Luyuan, Dong, Bingbing, Agathopoulos, Simeon, and Xu, Xin

Abstract

Li+ doping is a well-known, simple, yet efficient strategy to optimize the properties of upconverting materials. Nonetheless, the position of Li+ in the lattice and the mechanism of upconversion enhancement are still controversial, especially in Yb3+/Er3+ co-doped Y2O3. This paper presents a comprehensive investigation of the above issues (i.e. the position occupied by Li+ in the lattice and the mechanism of luminescence enhancement, in terms of decreased defects) by studying (Y0.78−XYb0.20Er0.02LiX)2O3 powders. Neutron powder diffraction was employed for the first time in the literature to show that Li+ ions are accommodated in Y sites of YO6 octahedra, confirmed also by the content of oxygen defects, which was increased with the increase of Li+ concentration. FT-IR showed that there was a small change in the amount and the type of the surface-absorbed groups with the increase in the Li+ content, thus not supporting the prevailing conclusion that the quenching groups are decreased by doping Li+. Positron annihilation lifetime (PLAS) experiments showed that the total defect concentration and the large defect clusters, which are considered as quenching centers, are decreased with increasing Li+-content, resulting in the enhancement of the emission intensity in Yb3+/Er3+ co-doped Y2O3. [ABSTRACT FROM AUTHOR]

Published
2020
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47. The crystal structure and luminescence properties of a novel green-yellow emitting Ca1.5Mg0.5Si1−xLixO4−δ:Ce3+ phosphor with high quantum efficiency and thermal stability

Author

Ji, Weiwei, primary, Xia, Zhiguo, additional, Liu, Ke, additional, Ali Khan, Sayed, additional, Hao, Luyuan, additional, Xu, Xin, additional, Yin, Liangjun, additional, Molokeev, Maxim S., additional, Agathopoulos, Simeon, additional, Yang, Wenyun, additional, Ma, Xiaobai, additional, Sun, Kai, additional, and da Silva, Ivan, additional

Published
2018
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48. Production and characterization of durable self‐cleaning and engineering porous Al2O3/CaAl12O19 ceramic membranes.

Author

Dong, Binbin, Yang, Mingye, Wang, Feihong, Wang, JunWei, Hao, LuYuan, Xu, Xin, Wang, Gang, and Agathopoulos, Simeon

Subjects
CHEMICAL stability, CONTACT angle, SURFACE active agents, BENDING strength, POROUS materials, POROUS metals
Abstract

The rapid development of engineering filtering process suggests that it is imperative to produce membrane substrates with a fine pore size, high gas permeation, and antifouling properties for efficient and long‐term application. This study reports on a novel fabrication method of a porous Al2O3/CaAl12O19 ceramic membrane substrate by a direct foaming method combined with cement solidification and tape‐casting technology. The microstructure of the produced ceramic membrane consisted of pores with a size of 50‐150 μm, which were interconnected with each other with a large number of small filtering functional pores of <10 μm. By increasing the amount of the foaming agent, the porosity of the porous Al2O3/CaAl12O19 ceramic membranes was tailored from 64.8% to 80.5%, and the bending strength decreased from 32.1 ± 1.0 to 9.6 ± 0.9 MPa, respectively. The sintered hydrophilic ceramic substrate was successfully modified to a hydrophobic one (with water contact angles of 143°) by pyrolysis of dimethyldichlorosilane and dichloromethylsilane. The resultant membrane displayed high chemical stability and self‐cleaning features. The membrane with a porosity of 64.8% had a N2 permeation of 3.0 (±0.5) × 107 L m−2 h−1 at 0.5 bar and a water flux which could be totally suppressed at a liquid entry pressure of 0.45 bar. [ABSTRACT FROM AUTHOR]

Published
2019
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49. Overtone spectrum of SiH stretching in H 2 SiCl 2

Author

Zhu Huai, Hu Sui-Ming, Hao Luyuan, Zheng Jingjing, Liu An-Wen, Ding Yun, and Chen Ping

Subjects
Coupling constant, Physics, Absorption spectroscopy, Normal mode, Overtone, Anharmonicity, General Physics and Astronomy, Overtone band, Physics::Chemical Physics, Atomic physics, Diatomic molecule, Hot band
Abstract

The overtone spectra of H2SiCl2 molecule in the regions of 2000–9000cm −1 and 12000–12900cm −1 at room temperatures have been studied by use of high-resolution Fourier transform spectroscopy and sensitive-intracavity-laser absorption spectroscopy, respectively. The variations of vibrational quantum numbers Δ VSiH =1, 2, 3, 4 and 6 for the overtones of the SiH stretching have been analysed and assigned with the local mode model and the normal mode model. The values of harmonic frequency ωm , anharmonicity constant χm , bond coupling constant λ, the Morse oscillator parameters D e , α and interaction force constant f rr' are derived from the experimental spectrum with nonlinear least-squares fitting. The most striking feature of the SiH2Cl2 is that the larger the vibrational energy, the smaller the energy difference between a couple of lowest stretching states of a given manifold and finally, the couple of lowest stretching states are degenerated within the experimental error for Δ VSiH≥4 vibrational manifolds. The degenerate energy level structure resembles that of a diatomic Morse oscillator; the transition energies show a remarkable fit to the Birge–Sponer relation. The high vibrational states can be described straightforward with a SiH diatomic Morse oscillator wavefunction, this is an indication of vibrational bond localization.

Published
2005

50. Local mode spectroscopic study of the AsH 3 molecule: the perturbed (500) local mode overton

Author

Wang Dong, Lin Hai, Igor M Olekhnovitch, Zhu Qing-shi, Chen Xi-yi, Hao Luyuan, and O.N. Ulenikov

Subjects
Physics, High energy, General Physics and Astronomy, Fourier transform spectra, Rotational energy, Vibration, symbols.namesake, Nonlinear system, Nuclear magnetic resonance, Normal mode, symbols, Molecule, Atomic physics, Hamiltonian (quantum mechanics)
Abstract

The high resolution Fourier transform spectra of AsH3 in the region of 9720-9900 cm-1, which had been recorded at a resolution of 0.015 cm-1, were assigned to the (500; A1) and (500; E) local mode overtones and rotationally analyzed. The effective spectroscopic parameters were obtained by nonlinear least-squares fitting the vibration-rotational Hamiltonian with the rotational energy levels up to J=6 (98 levels in all) included. The evolution of the rotational energy patterns from v=1 to v=6 shows that the tendency of normal mode to local mode vibration evolution has been stopped by perturbations in relatively high energy region.

Published
2000

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