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Nanocomposite Ni-CGO Synthesized by the Citric Method as a Substrate for Thin-film IT-SOFC
Zhenwei Wang,Yu Liu,Shin-ichi Hashimoto,Masashi Mori 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.12
Ni-ceria cermets have been extensively investigated as candidates for the anode in intermediate-temperature solid oxide fuel cells. We have used the citric method to synthesize nanocomposite powders consisting of NiO (Ni metal content: 40~60% by volume) highly dispersed in Ce0.9Gd0.1O1.95 (CGO). The microstructure characteristics and sintering behaviors of the nanocomposites were investigated. No impurity phases were observed and the shrinkage of these substrates matched well with that of a CGO electrolyte with a specific surface area of 11 m2/g. Densification of the CGO electrolyte layer to <5 μm thickness was achieved by co-firing the laminated electrolyte with the porous NiO-CGO substrate at 1400oC for 6 h. Ni-ceria cermets have been extensively investigated as candidates for the anode in intermediate-temperature solid oxide fuel cells. We have used the citric method to synthesize nanocomposite powders consisting of NiO (Ni metal content: 40~60% by volume) highly dispersed in Ce0.9Gd0.1O1.95 (CGO). The microstructure characteristics and sintering behaviors of the nanocomposites were investigated. No impurity phases were observed and the shrinkage of these substrates matched well with that of a CGO electrolyte with a specific surface area of 11 m2/g. Densification of the CGO electrolyte layer to <5 μm thickness was achieved by co-firing the laminated electrolyte with the porous NiO-CGO substrate at 1400oC for 6 h.
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.
Nanocomposite Ni-CGO Synthesized by the Citric Method as a Substrate for Thin-film IT-SOFC
Wang, Zhenwei,Liu, Yu,Hashimoto, Shin-ichi,Mori, Masashi The Korean Ceramic Society 2008 한국세라믹학회지 Vol.45 No.12
Ni-ceria cermets have been extensively investigated as candidates for the anode in intermediate-temperature solid oxide fuel cells. We have used the citric method to synthesize nanocomposite powders consisting of NiO (Ni metal content: $40{\sim}60%$ by volume) highly dispersed in $Ce_{0.9}Gd_{0.1}O_{1.95}$ (CGO). The microstructure characteristics and sintering behaviors of the nanocomposites were investigated. No impurity phases were observed and the shrinkage of these substrates matched well with that of a CGO electrolyte with a specific surface area of $11\;m^2/g$. Densification of the CGO electrolyte layer to $<5\;{\mu}m$ thickness was achieved by co-firing the laminated electrolyte with the porous NiO-CGO substrate at $1400^{\circ}C$ for 6 h.
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.
Koichi Inukai,Akihiro Usui,Yu Hashimoto,Fumitaka Kato,Koji Amano,Hiroyuki Kayata,Nobutaka Mukai,Naoki Shinyama 대한외상중환자외과학회 2022 Journal of Acute Care Surgery Vol.12 No.3
Purpose Despite widespread adoption of open abdominal management (OAM), there is currently no threshold criterion for OAM duration for non-trauma patients. Moreover, there is a positive relationship between morbidity and the duration of OAM, but an uncertain relationship with patients’ age. Therefore, a novel clinical index for the duration of open abdominal management (IDOM) was developed based on the patient’s age and risk of severe complications following OAM to indicate the maximum tolerable number of days of OAM based on the individual’s age. The utility of this new index was evaluated. Methods This retrospective study included 65 non-trauma patients managed with an open abdomen (OA) from August 2015 to August 2018. The IDOM was developed based on the patient’s age. The result indicated the maximum number of OA days. Patients’ demographic and operative variables were examined and patient data was assigned to one of two groups according to whether the actual number of OA days was above or below the calculated IDOM. Prevalence of complications between these groups was compared. Measures of validity were employed to assess the utility of the IDOM for patient complications. Results Sixty-five patients were included. The above-the calculated IDOM group exhibited a significantly longer OA and higher rates of wound complications and postoperative respiratory complications compared with the below the calculated IDOM group. The IDOM predicted the incidence of OA-related complications with a sensitivity of 72.4%, and a specificity of 80.6%. Conclusion The IDOM is a potentially useful tool for appropriate duration at the outset of OA.
Yagi Sen,Furukawa Shinya,Shiraishi Kana,Miyake Teruki,Tange Kazuhiro,Hashimoto Yu,Kitahata Shogo,Kawamura Tomoe,Ninomiya Tomoyuki,Mori Kenichirou,Suzuki Seiyuu,Shibata Naozumi,Murakami Hidehiro,Ohashi 대한대장항문학회 2023 Annals of Coloproctolgy Vol.39 No.2
Purpose: The albumin-to-globulin ratio (AGR) is a recognized chronic inflammation marker. No evidence regarding the relationship between AGR level and ulcerative colitis (UC) exists. The aim of this study was to evaluate the association between AGR and clinical outcomes among Japanese subjects with UC. Methods: The study subjects consisted of 273 Japanese individuals with UC. AGR was divided into 4 categories (low, moderate, high, and very high). The definition of complete mucosal healing (MH) was based on the Mayo endoscopic subscore of 0. Clinical remission (CR) was defined as no rectal bleeding and no abnormally high stool frequency (<3 times per day). Results: The percentage of MH was 26.4%. High AGR and very high AGR were significantly positively correlated with CR (adjusted odds ratio [OR], 5.85; 95% confidence interval [CI], 2.52–14.18 and adjusted OR, 4.97; 95% CI, 2.14–12.04) and complete MH (adjusted OR, 4.03; 95% CI, 1.56–11.51 and adjusted OR, 5.22; 95% CI, 1.97–14.89), respectively after adjustment for confounding factors (P for trend=0.001). Only in the low C-reactive protein (CRP) group (≤0.1 mg/dL), very high AGR was significantly positively correlated with complete MH but not CR (adjusted OR, 4.38; 95% CI, 1.06–21.77; P for trend=0.017). In the high CRP group, no correlation between AGR and complete MH was found. Conclusion: Among Japanese patients with UC, AGR may be independently positively correlated with complete MH. In particular, among UC patients with low CRP, AGR might be a useful complementary marker for complete MH.