Thermal stability study of SDC/Na2CO3 nanocomposite electrolyte for low-temperature SOFCs

The novel core–shell nanostructured SDC/Na₂CO₃ composite has been demonstrated as a promising electrolyte material for low-temperature SOFCs. However, as a nanostructured material, stability might be doubted under elevated temperature due to their high surface energy. So in order to study the thermal stability of SDC/Na₂CO₃ nanocomposite, XRD, BET, SEM and TGA characterizations were carried on after annealing samples at various temperatures. Crystallite sizes, BET surface areas, and SEM results indicated that the SDC/Na₂CO₃ nanocomposite possesses better thermal stability on nanostructure than pure SDC till 700 °C. TGA analysis verified that Na₂CO₃ phase exists steadily in the SDC/Na₂CO₃ composite. The performance and durability of SOFCs based on SDC/Na₂CO₃ electrolyte were also investigated. The cell delivered a maximum power density of 0.78 W cm⁻² at 550 °C and a steady output of about 0.62 W cm⁻² over 12 h operation. The high performances together with notable thermal stability make the SDC/Na₂CO₃ nanocomposite as a potential electrolyte material for long-term SOFCs that operate at 500–600 °C.     

Microwave synthesis of mesoporous Cu-Ce0.8Sm0.2O2−δ composite anode for low-temperature ceramic fuel cells

In recent year, new nanocomposite electrolytes materials have been developed for low-temperature ceramic fuel cells (CFCs). To further improve the performance of CFCs based on the nanocomposite electrolyte, compatible active anode with sufficient low polarizations is needed. To improve the performance of anode, i.e. to enlarge tripe phase boundaries (TPB), anode materials with both porous structure and phase homogeneity of metal and ceramic are preferred. In the present study, we developed a novel microwave-assisted template-, surfactant-free synthesis route for mesoporous CuO–Ce_0.8Sm_0.2O_2−δ composite anode by homogeneous precipitation of microspherical precursor in aqueous solutions followed by calcination. The composite anode sample was characterized by thermogravimetry analysis, X-ray diffraction, SEM, EDX, etc. The characterization results indicated that CuO–SDC composite anode with mesoporous structure was prepared and both SDC and CuO phases were homogenously distributed. Fuel cells have been constructed using as-prepared composite as anodes and lithiated NiO as cathode based on the SDC–carbonate nanocomposite electrolyte. Fuel cell performance tests indicated that the cell with mesoporous Cu–SDC anode had better performance than conventional Cu–SDC anode prepared by solid-state method.     

氯化钠在个人护理用品中的创新应用

介绍了氯化钠具有增稠、稳定、调节油水表面张力、杀菌消炎、按摩等特殊效果及其在个人护理用品中的创新应用.     

“层”论——当代城市建筑语言

在建筑密集的城市环境中,被多重层状界面划分所构成的室内,外空间已经逐渐成为人们感知城市的基本印象.笔者通过剖析当代城市中典型建筑的设计方法,提出广泛存在于建筑形式中的“层”的概念,明确“层”是当代建筑的基本词汇“编辑”则是对于“层”的理性处理的方法.进而将“层”的概念扩展到城市,认为城市空间是“层组”的多维集合,以此建立认识建筑的新的思维框架.建筑的个性化创作尽管存在着不同的途径,但可以归纳为对形成围合的“层组”进行独特的秩序表达,并通过“编辑”的方法形成建筑空间形态的过程.     

大明宫国家遗址公园：总体景观实施方案设计

2010年9月30日,国家文物局局长单霁翔先生在大明宫国家遗址公园开园仪式上致辞：＂……两年来,大明宫遗址上不合理占压考古遗址的350万m~2建筑全部拆除,大明宫遗址从不断遭到蚕食破坏的状况下得到了永续保护。同时,10万民众改善了生活居住条件,极大地提升了道北地区的城市生态环境,     

建筑师的“礼”·“敬”·“慧”——围绕年会主题之思考

这次建筑学年会的主题是“建筑我们的和谐家园”,那么什么是和谐家园?在建设和谐家园的过程中,中国建筑师应扮演怎样的角色?具备哪些方面的能力?通过城市、传统、与当代艺术的关联性三方面对建筑师的“礼”、“敬”、“慧”进行阐述,并结合相应的设计作品来回答这些问题.     

个人清洁用品中低温下抗果冻效应的黏度调节剂

通过改变ULTRASOFT 505(羟丙基甲基纤维素/水辉石/异十三醇醚复合物)的不同配比,观察了其在不同温度条件下黏度的变化。与同类产品相比,ULTRASOFT 505具有良好的黏度调节性能和增稠效果。     

高强焊丝用钢XG55的开发与生产

介绍了宣钢低成本高强度焊丝用钢XG55的开发与生产情况,通过合理运用微合金化技术和控制轧制工艺,逐步形成了稳定的低成本XG55的生产工艺路线,产品质量稳定,组织性能优良,满足了用户要求。     

基于UPLC-Triple-TOF MS/MS对巴氏杀菌乳中磷脂成分的分析

基于超高效液相色谱-串联四极杆飞行时间高分辨质谱（ultra-high performance liquid chromatography-triple quadrupole-time of flight tandem mass spectrometry,UPLC-Triple-TOF MS/MS）法对巴氏杀菌乳中的磷脂成分进行分析鉴定。采用色谱柱ACQUITY UPLC? BEH C18（2.1 mm×100 mm,1.7 μm）,以流动相A水-甲醇-乙腈（1∶1∶1,V/V）和流动相B异丙醇-乙腈（1∶1,V/V）进行梯度洗脱,在电喷雾电离正模式下采集数据。依据高分辨质谱提供的保留时间、准分子离子、二级碎片等脂质分析数据,并结合标准品碎裂方式等信息,共鉴定出磷脂分子68 种。其中,磷脂酰胆碱22 种,占比7.98%;磷脂酰乙醇胺17 种,占比56.60%;磷脂酰丝氨酸10 种,占比1.70%;磷脂酰肌醇7 种,占比1.33%;鞘磷脂12 种,占比32.39%。本研究采用灵敏度高、精密度及稳定性良好的UPLC-Triple-TOF MS/MS方法实现了对牛乳中磷脂的全面定性与定量分析。此方法检测出的牛乳磷脂信息完整、磷脂种类多于其他检测技术,可为牛乳的磷脂研究提供数据基础。     

鱼副产物蛋白水解物生物活性及应用研究进展

鱼副产物蛋白质含量丰富、营养价值高,但综合利用程度较低,不仅会造成资源浪费,还会导致环境问题。研究表明,鱼副产物经蛋白酶处理能够得到小分子肽类水解物,其表现出抗氧化活性、抗冻性能、抗菌性、降血压等功能活性,可作为潜在的营养补充剂和食品添加剂。本文综述了鱼副产物蛋白水解物的制备、生物活性及应用前景,总结了生产中存在的问题及发展趋势,旨在为鱼副产物蛋白水解物的研究和应用提供参考。