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RISS 인기검색어
- 검색키워드
- 저자 : Shuhua Ma (검색결과 4 건)
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Investigation of Li Dopant as a Sintering Aid for ScSZ Electrolyte for IT-SOFC
Masashi Mori,Yu Liu,Shuhua Ma,Shin-ichi Hashimoto,Katsuhito Takei 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.12
In this study, the effects of small amounts (≤3 mol%) of Li doping on the sintering characteristics and electrochemical performance of (ZrO2)0.89(ScO1.5)0.1(CeO2)0.01 (ScSZ) were investigated. By adding 3 mol% lithium, the densification temperature of ScSZ was reduced from the conventional temperature of 1400oC to 1200oC. It was found that Li doping also led to changes in the Zr:Sc ratio at the grain boundaries. Correspondingly, the dispersion of lithium zirconia at the grain boundaries accelerated the growth of ScSZ grains and increased the grain boundary resistance at temperatures below 450oC. At elevated temperatures of 450~750oC, the electrical conductivity of the ScSZ after doping remained almost unchanged under air and reducing atmospheres. These results suggest that the addition of lithium is promising for use in low temperature co-firing of ScSZ-based components for intermediate temperature solid oxide fuel cells. In this study, the effects of small amounts (≤3 mol%) of Li doping on the sintering characteristics and electrochemical performance of (ZrO2)0.89(ScO1.5)0.1(CeO2)0.01 (ScSZ) were investigated. By adding 3 mol% lithium, the densification temperature of ScSZ was reduced from the conventional temperature of 1400oC to 1200oC. It was found that Li doping also led to changes in the Zr:Sc ratio at the grain boundaries. Correspondingly, the dispersion of lithium zirconia at the grain boundaries accelerated the growth of ScSZ grains and increased the grain boundary resistance at temperatures below 450oC. At elevated temperatures of 450~750oC, the electrical conductivity of the ScSZ after doping remained almost unchanged under air and reducing atmospheres. These results suggest that the addition of lithium is promising for use in low temperature co-firing of ScSZ-based components for intermediate temperature solid oxide fuel cells.
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Investigation of Li Dopant as a Sintering Aid for ScSZ Electrolyte for IT-SOFC
Mori, Masashi,Liu, Yu,Ma, Shuhua,Hashimoto, Shin-ichi,Takei, Katsuhito The Korean Ceramic Society 2008 한국세라믹학회지 Vol.45 No.12
In this study, the effects of small amounts (${\leq}3\;mol%$) of Li doping on the sintering characteristics and electrochemical performance of $(ZrO_2)_{0.89}(ScO_{1.5})_{0.1}(CeO_2)_{0.01}$ (ScSZ) were investigated. By adding 3 mol% lithium, the densification temperature of ScSZ was reduced from the conventional temperature of $1400^{\circ}C$ to $1200^{\circ}C$. It was found that Li doping also led to changes in the Zr:Sc ratio at the grain boundaries. Correspondingly, the dispersion of lithium zirconia at the grain boundaries accelerated the growth of ScSZ grains and increased the grain boundary resistance at temperatures below $450^{\circ}C$. At elevated temperatures of $450{\sim}750^{\circ}C$, the electrical conductivity of the ScSZ after doping remained almost unchanged under air and reducing atmospheres. These results suggest that the addition of lithium is promising for use in low temperature co-firing of ScSZ-based components for intermediate temperature solid oxide fuel cells.
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Effects of resveratrol on mitochondrial biogenesis and physiological diseases
Uriho Angelo,Tang Xue,Le Guowei,Yang Shaojun,Harimana Yves,Ishimwe Steven Papy,Yiping Lu,Zhang Kai,Ma Shuhua,Muhoza Bertrand 경희대학교 융합한의과학연구소 2021 Oriental Pharmacy and Experimental Medicine Vol.21 No.1
Plants produce a number of biological active substances with healthy benefits. Resveratrol (3,5,4′-trihydroxystilbene), a polyphenol produced by plants has been associated with many health beneficial properties, including its ability to induce mitochondrial biogenesis and fight against health problems such as obesity, inflammation, heart diseases, cancers among others. Mitochondrial dysfunction is recognized as central to the pathogenesis and development of many diseases. Thus the present review describes how resveratrol (RSV) may counteract physiological and age-related diseases/disorders through its effect on mitochondrial biogenesis and function. In addition, we discuss the chemistry, main sources, and the doses of RSV shown in previous studies to be efficient for the prevention and treatment of different diseases. Through its ability to improve mitochondrial dysfunction, RSV can be used in the prevention and/or treatment of human physiological diseases. However, more research for optimal dose in a human scale is still relevant. This review brings new hope to the therapy of physiological diseases as it will provide useful future perspectives for the planning of clinical studies on RSV and mito-chondrial dysfunction-related diseases.
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Long, Zhi,Gao, Liqin,Li, Yankai,Kang, Baotao,Lee, Jin Yong,Ge, Junjie,Liu, Changpeng,Ma, Shuhua,Jin, Zhao,Ai, Hongqi American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.44
<P>The self-assembly powder (SAP) with varying Nafion content was synthesized and characterized by XRD, XPS, HRTEM, and mapping. It is observed that the oxygen from oxygen functional groups transfers to the surface of Pt and generate PtO during the process of self-assembly with the mechanism of micro galvanic cell, where Pt, carbon black, and Nafion act as the anode, cathode and electrolyte, respectively. The appearance of PtO on the surface of Pt leads to a turnover of Nafion structure, and therefore more hydrophilic sulfonic groups directly contact with Pt, and thus the triple-phase boundary (TPB) has been expanded.</P>
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