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151 results on '"Hu, Qiangqiang"'

28. Crystal growth and enhanced magneto-optical properties of a terbium aluminum gallium garnet crystal for Faraday isolators.

Author

Yang, Xianxian, Xin, Xianhui, Hao, Yuankai, Zhang, Zhen, Hu, Qiangqiang, Fu, Xiuwei, Jia, Zhitai, and Tao, Xutang

Subjects
CRYSTAL growth, GARNET, TERBIUM, GALLIUM, CRYSTALS, SINGLE crystals, ALUMINUM
Abstract

The rapid development of kilowatt-level lasers is in urgent need of excellent magneto-optical materials for Faraday isolators. In this work, a new component Tb3Al2Ga3O12 crystal was designed to meet applications in high-power lasers. A high-quality single crystal has been successfully obtained by the Czochralski technique. The Tb3Al2Ga3O12 crystal is verified to have high crystallinity with a small full width at half maximum (FWHM) of 43.2′′ and exhibits excellent uniformity, especially enhanced magneto-optical properties, exceeding ∼7–15% that of the traditional TGG crystal. These excellent attributes suggest that the Tb3Al2Ga3O12 crystal can be a promising candidate for Faraday isolators. [ABSTRACT FROM AUTHOR]

Published
2024
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36. Synthesis of BaZr0.1Ce0.7Y0.2O3‐δ nano‐powders by aqueous gel‐casting for proton‐conducting solid oxide fuel cells.

Author

Wang, Donggang, Zhang, Zhenhao, Song, Tao, Sun, Haibin, Li, Jiao, Guo, Xue, Hu, Qiangqiang, Feng, Yurun, and Zhao, Shikai

Subjects
SOLID state proton conductors, POWDERS, SOLID oxide fuel cells, ELECTRIC conductivity, SPECIFIC gravity
Abstract

For the sake of enhance the sinter ability and electrical conductivity of BaZr0.1Ce0.7Y0.2O3‐δ (BZCY) electrolytes, a modified aqueous gel‐casting method was applied to synthesize high sintering active and high conductive BZCY nano‐powders. The new approach makes it easy to obtain pure perovskite. The highly sintering active purity‐phase of BZCY nano‐powder (particle size of 50∼100 nm) was obtained by calcining at 1100°C for 2 h. Nano‐powders effectively reduce the sintering densification temperature and successfully prepare BZCY electrolyte with relative density > 96 % at 1450°C, and promote grain growth with an average grain size of 2.36 μm. Benefiting from this, improved electrical conductivities (e.g., 12.4×10−3 S cm−1 at 700°C, in wet air) are obtained. The NiO‐BZCY/BZCY/LSCF‐BZCY anode‐supporting single cell shows a peak power density of 0.75 W cm−2 at 700°C while taking ambient air as oxidants and wet H2 (∼3 vol.% H2O) as fuels. [ABSTRACT FROM AUTHOR]

Published
2024
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44. High-entropy cathodes with Cr and CO2tolerance via the combination of Ba0.5Sr0.5Co0.8Fe0.2O3-δand Nd, Ni, Zr ternary doping for both oxygen ion and proton conducting solid oxide fuel cells

Author

Li, Zhiyuan, Sun, Haibin, Zhao, Fulai, Yu, Fangyong, Sunarso, Jaka, Guo, Xue, Hu, Qiangqiang, Feng, Yurun, and Xie, Peitao

Abstract

The sluggish kinetics of oxygen reduction reaction (ORR) and the degradation of cathodes caused by Cr and CO2poisoning are major obstacles to the commercial application of solid oxide fuel cells (SOFCs). It is still challenging to achieve composite cathodes with both high ORR activity and excellent Cr, CO2tolerance, and design composite cathodes suitable for both oxygen ion and proton SOFCs. Taking advantage of high-entropy materials, here, we report our findings in harnessing high-throughput computational methods to expedite the design of novel composite cathodes based on Ba0.5Sr0.5Co0.8Fe0.2O3-δ(BSCF) as the matrix. We methodically compute the lattice substitution energy (Els), O projected density of states (O p-Dos), and the work function for a set of 13-element candidates. Our research underscores BNSCNZF (Ba0.4Nd0.1Sr0.5Co0.6Ni0.1Zr0.1Fe0.2O3-δ), the combination of BSCF and Nd, Ni, Zr ternary doping, as a promising and revolutionary candidate, exhibiting superior performance in terms of electronic conductivity, oxygen adsorption, and transport activity compared to the established BSCF series. BNSCNZF incorporating Sm0.2Ce0.8O2-δ(SDC) and BaZr0.1Ce0.7Y0.2O3-δ(BZCY) as the electrolyte achieves very low polarization resistances (Rp) in the symmetric cell mode (0.02 Ω cm−2and 0.56 Ω cm−2at 700 °C, respectively). BNSCNZF also exhibits excellent tolerance to Cr and CO2poisoning due to its higher energy barriers for impurity generation and higher absorption energy of produced impurities from the matrix. The oxide ion and proton single cells with BNSCNZF exhibit excellent power densities of 1.21 W cm−2and 0.63 W cm−2at 700 °C, respectively, which are higher than that with BSCF cathode (1.03 W cm−2and 0.53 W cm−2at 700 °C).

Published
2025
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