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RISS 인기검색어
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- 저자 : Xuebing Hu (검색결과 3 건)
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XUEBING HU,LIXIN SONG,YUN YU,JIANER ZHOU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.3
Graphene oxide (GO) has attracted much attention as a derivative of graphene. In addition, itappears to have many unique physicochemical properties and has been investigated widely inmany areas. Herein, we prepare GOs using °ake graphite (FG), expandable graphite (EG) andmicrocrystalline graphite (MG) as graphite precursors by the modi¯ed Hummers method. According to the X-ray di®raction (XRD), Fourier transform infrared spectroscopy, X-rayphotoelectron spectroscopy (XPS) and Raman spectroscopy, we characterize the component, thefunctional group, the chemical state of the element and the structural disorder of the obtainedGOs to reveal their oxidation degree. Besides, we evaluate the hydrophilicity of the obtained GOswith the water contact angle, and observe their microstructures by transmission electron mi-croscopy (TEM). We ¯nd that the GO prepared with EG has a higher-degree oxidation andbetter hydrophilicity, and it will be exfoliated easily and forms a monolayer or quasi-monolayerstructure. Finally, based on the structural characteristic of graphite precursor, we build theintercalation and oxidation model to illuminate the phenomenon.
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Xiaozhen Zhang,Yuhua Jiang,Xuebing Hu,Liangliang Sun,Yihan Ling 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.2
Proton-conducting solid oxide fuel cell (H-SOFC) based on layered perovskite type GdBaCuCoO5+x (GBCC) cathodewas fabricated with in situ drop-coating BaZr0.1Ce0.7Y0.2O3−δ (BZCY) electrolyte membrane. The influences of Cu dopinginto Co sites of GdBaCo2O5+x on the electrical conductivity and conduction mechanism, thermal expansion propertyand electrochemical performance of cathode materials and corresponding single cell were investigated. Results show thatthe electrical conductivity decreased and the conduction mechanism would gradually transform to the semiconductor-likebehavior. A high maximum power density of 480 mW cm−2 was obtained for the anode supported NiO–BZCY/NiO–BZCY/BZCY/GBCC single cells with wet H2fuel at 700 °C. The corresponding polarization resistance was as low as 0.17 Ω cm2. The excellent electrochemical performance of as-prepared single cell indicates that GBCC is a good candidate of cathodematerials for H-SOFCs.
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Compressive Mechanical Properties and Shock-Induced Reaction Behavior of a Ti–29Nb–13Ta–4.6Zr Alloy
Zhiping Guo,Ran Liu,Chuan Ting Wang,Yong He,Yuan He,Yue Ma,Xuebing Hu 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.10
The compressive mechanical properties of a Ti–29Nb–13Ta–4.6Zr alloy were investigated at room temperature under variousstrain rates. The parameters of a modified Johnson–Cook constitutive equation were determined to describe the strainsoftening behavior under dynamic conditions. The testing results under compression show yield strength evidently increaseswith the increase of the strain rate. Moreover, it was found that the strain-rate effect of the yield strength upon dynamicdeformation is more significant than that upon quasi-static deformation. In order to characterize the impact-initiated reactionbehavior of Ti–29Nb–13Ta–4.6Zr alloy, the quasi-sealed test chamber was used to measure the pressure caused by energyreleased of fragments. It was obviously shown that the exothermic chemical reaction was more intense with the increase ofimpact velocity.
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