Electrocatalytic Oxidation of Ethanol on Pt/nanoTiO_2-CNT Complex Catalysts

通过前驱体Ti(OEt)4直接水解和电化学扫描电沉积法制备在Ti基体上的纳米TiO2-碳纳米管复合膜载Pt(Pt/nanoTiO2-CNT)复合催化剂.透射电镜(TEM)和X射线衍射(XRD)结果表明,锐钛矿型纳米TiO2粒子和Pt纳米粒子(粒径均为5～10nm)均匀地分散在碳纳米管表面.通过循环伏安和计时电流法研究表明,Pt/nanoTiO2-CNT复合催化剂(Pt载量为0.32mg·cm-2)具有高达51.8m2·g-1的电化学活性比表面积,常温常压下对乙醇的电化学氧化具有高催化活性和稳定性,乙醇氧化峰电位分别为0.59、0.96和0.24V,氧化峰电流密度分别达到-115、-113和-75mA·cm-2.复合催化剂对乙醇电氧化的高催化活性可归因于nanoTiO2、CNT和Pt纳米粒子的协同催化作用.Pt/nanoTiO2-CNT complex catalysts were prepared by direct hydrolysis of Ti(OEt)4 and electrochemical scan electrodepositing method. The results of XRD and SEM showed that the nanoTiO2 (anatase) and Pt nanoparticles (size about 5～10 nm) were dispersed uniformly on CNT film surface. The electrocatalytic activity of Pt/nanoTiO2-CNT electrode was investigated by cyclic voltammetry and chronopotentiogram. The results indicated that Pt/nanoTiO2-CNT electrode (Pt loading was 0.32 mg·cm-2) exhibited high electrochemical activity surface area (51.8 m2·g-1) and very high electrocatalytic activity and stability for the electro-oxidation of ethanol at room temperature in atmosphere pressure. The oxidation peak potentials of ethanol were 0.59, 0.96, and 0.24 V, and the corresponding oxidation peak current sdensities were -115, -113, and -75 mA·cm-2. The high electrocatalytic activity and good stability can be attributed to the synergistic catalytic effect among nanocomposite.国家自然科学基金(20476001);; 安徽省自然科学基金(00045317)资助项

Electrocatalytic oxidation of ethanol on Pt/nanoTiO(2)-CNT complex catalysts

Pt/nanoTiO(2)-CNT complex catalysts were prepared by direct hydrolysis of Ti(OEt)(4) and electrochemical scan electrodepositing method. The results of XRD and SEM showed that the nanoTiO(2) (anatase) and Pt nanoparticles (size about 5 similar to 10 nm) were dispersed uniformly on CNT film surface. The electrocatalytic activity of Pt/nanoTiO(2)-CNT electrode was investigated by cyclic voltammetry and chronopotentiogram. The results indicated that Pt/nanoTiO(2)- CNT electrode (Pt loading was 0.32 mg . cm(-2)) exhibited high electrochemical activity surface area (51.8 m2. g(-1)) and very high electrocatalytic activity and stability for the electro-oxidation of ethanol at room temperature in atmosphere pressure. The oxidation peak potentials of ethanol were 0.59, 0.96, and 0.24 V, and the corresponding oxidation peak current sdensities were - 115, -113, and -75 mA . cm(-2). The high electrocatalytic activity and good stability can be attributed to the synergistic catalytic effect among nanocomposite

白族作家景宜小说的民俗文化

兼有少数民族作家和女性作家双重身份的白族作家景宜，其不同时期的创作类型反映了她个人创作视野的变化，其中早期的小说创作奠定了她创作视野的基础。本文以白族女作家景宜的小说为研究对象，通过研究景宜小说中白族民俗文化的继承与超越，探究白族民俗文化对景宜小说的影响。</jats:p

多枝柽柳的开花动态及花粉活力和柱头可授性研究

【目的】测试多枝柽柳花粉活力和柱头可授性在开花散粉后的动态变化规律,为进一步研究其有性繁殖提供基础资料。【方法】分别在新疆吐鲁番和阜康选取10株健康多枝柽柳植株,定株观察其的开花动态和花后柱头的形态变化,并用MTT法检测其花粉活力(每次用3朵花)和柱头可授性(每次用20朵花的柱头)。【结果】多枝柽柳在06:30～08:00开花,单花花期只有1d;花粉活力随生境不同而有所差异,多枝柽柳花药刚散粉时花粉活力最高,达84%以上,24h后活力迅速下降;不同花期、不同生境条件下植株的花粉活力下降速度一致,其活力可持续48h;柱头可授性的持续时间在吐鲁番春花期和阜康春花期、夏花期之间不存在差异(34h),而吐鲁番夏花期的柱头可授性仅持续24h;柱头呈现白色时具有可授性。【结论】多枝柽柳花粉具有高活力的时间与柱头具有强可授性的时间正好吻合,说明其适应自花传粉的机制,柱头在花朵开放前已具有可授性,有支持异交而降低自交的倾向

Revision of the Chinese Version of Affiliate Stigma Scales for Parents of Children with Autism

目的:修订中文版连带内化污名量表(Affiliate Stigma Scale,ASS),在中国大陆自闭症患儿父母群体中进行信效度分析。方法:采用中文版连带内化污名量表、抑郁&mdash;焦虑&mdash;压力量表、生活满意度量表、接纳与行动量表和认知融合问卷对中国特殊儿童评估与干预平台上注册的1625名自闭症患儿父母进行测量,得到有效问卷1400份,间隔三周后使用修订后的ASS量表对199名自闭症患儿父母进行重测。结果:使用探索性因子分析的方法萃取出4个特征值&gt;1的因子,因子累积贡献率60.42%。验证性因子分析数据拟合较好(&chi;~2/df=4.86,GFI=0.905,NFI=0.873,CFI=0.896,TLI=0.872,IFI=0.869,RMSEA=0.074,SRMR=0.075),支持四因素模型。修订后的ASS量表的Cronbach&alpha;系数为0.883,重测信度0.755,且与效标量表呈显著相关(r=0.421-0.496, P&lt;0.001)。结论:中文修订版连带内化污名量表具有良好的信效度,可适用于大陆地区评估自闭症患儿父母的连带内化污名水平。</p