采用水热法制备了不同Ag修饰量的Ag/MoO_2纳米复合材料,并利用浸渍法将其负载在多孔泡沫镍(Nickel foam,NF)上制备成Ag/MoO_2/NF无粘结剂型直接电极。在该电极中Ag/MoO_2纳米颗粒均匀地负载在泡沫镍上形成了三维网络结构,其中MoO_2纳米...采用水热法制备了不同Ag修饰量的Ag/MoO_2纳米复合材料,并利用浸渍法将其负载在多孔泡沫镍(Nickel foam,NF)上制备成Ag/MoO_2/NF无粘结剂型直接电极。在该电极中Ag/MoO_2纳米颗粒均匀地负载在泡沫镍上形成了三维网络结构,其中MoO_2纳米颗粒是由~10 nm的纳米晶组成。当Ag修饰量为5%时,Ag0.05/MoO_2/NF具有最佳的电化学性能:在0.1 C的电流密度下,首次放电比容量高达1180 m Ah/g,100次循环后仍保持805 m Ah/g;且当电流密度由2 C降低至0.1 C时,比容量由468 m Ah/g升高至820 m Ah/g,表现出优异的储锂性能。展开更多
目的了解重度脂血对间接离子选择电极法测定血清电解质K^+、Na^+、Cl^-的影响。方法取血脂正常、轻中度血脂升高和重度血脂升高血清标本,各20份,分别在日立7600全自动生化分析仪和罗氏cobas b 123血气分析仪检测K^+、Na^+、Cl^-,对结果...目的了解重度脂血对间接离子选择电极法测定血清电解质K^+、Na^+、Cl^-的影响。方法取血脂正常、轻中度血脂升高和重度血脂升高血清标本,各20份,分别在日立7600全自动生化分析仪和罗氏cobas b 123血气分析仪检测K^+、Na^+、Cl^-,对结果进行比较分析。结果对于血脂正常和轻、中度血脂升高的标本,日立7600全自动生化分析仪和罗氏cobas b 123血气分析仪检测的结果比较,差异无统计学意义(P>0.05);重度脂血标本日立7600全自动生化分析仪的检测结果低于罗氏cobas b 123血气分析仪的检测结果,差异有统计学意义(P<0.05)。结论对于重度脂血标本,直接离子选择电极法检测K^+、Na^+、Cl^-的结果更为真实可靠。展开更多
Direct methanol fuel cells （DMFCs） are promising for use in portable devices because of advantages such as high fuel energy density, low working temperature and low emission of pollutants. Nanotechnology has been us...Direct methanol fuel cells （DMFCs） are promising for use in portable devices because of advantages such as high fuel energy density, low working temperature and low emission of pollutants. Nanotechnology has been used to improve the performance of DMFCs. Catalytic materials composed of small, metallic particles with unique nanostructure supparted on carbons or metal oxides have been widely investigated for use in DMFCs. Despite our increased understanding of this type of fuel cell, many challenges still remain. This paper reviews the current developments of nanostructured elec- trocatalytic materials and porous electrodes for use in DMFCs. In particular, this review focuses on the synthesis and characterization of nanostructured catalysts and supporting materials. Both computational and experimental approaches to optimize mass transportation in porous electrodes of DMFCs, such as theoretical modeling of internal transfer processes and preparation of functional structures in membrane electrode assemblies, are introduced.展开更多
Two different poling techniques-corona poling and contact poling in the backdrop of electro-optic （EO） polymer modulators are compared. A 3-layer structure EO polymer modulator is prepared for the poling. The poling...Two different poling techniques-corona poling and contact poling in the backdrop of electro-optic （EO） polymer modulators are compared. A 3-layer structure EO polymer modulator is prepared for the poling. The poling setups and procedures of these two different methods are given. It is found that a well-controlled precure step is very critical, otherwise it will result in either lower poling efficiency or damaged film. Experimental results show that contact poling does not create severe surface damage as corona poling and poling voltage is much lower, but corona poling provides higher EO effect than contact poling. Besides, contact poling can provide poling size as large as the substrate size.展开更多
文摘采用水热法制备了不同Ag修饰量的Ag/MoO_2纳米复合材料,并利用浸渍法将其负载在多孔泡沫镍(Nickel foam,NF)上制备成Ag/MoO_2/NF无粘结剂型直接电极。在该电极中Ag/MoO_2纳米颗粒均匀地负载在泡沫镍上形成了三维网络结构,其中MoO_2纳米颗粒是由~10 nm的纳米晶组成。当Ag修饰量为5%时,Ag0.05/MoO_2/NF具有最佳的电化学性能:在0.1 C的电流密度下,首次放电比容量高达1180 m Ah/g,100次循环后仍保持805 m Ah/g;且当电流密度由2 C降低至0.1 C时,比容量由468 m Ah/g升高至820 m Ah/g,表现出优异的储锂性能。
文摘目的了解重度脂血对间接离子选择电极法测定血清电解质K^+、Na^+、Cl^-的影响。方法取血脂正常、轻中度血脂升高和重度血脂升高血清标本,各20份,分别在日立7600全自动生化分析仪和罗氏cobas b 123血气分析仪检测K^+、Na^+、Cl^-,对结果进行比较分析。结果对于血脂正常和轻、中度血脂升高的标本,日立7600全自动生化分析仪和罗氏cobas b 123血气分析仪检测的结果比较,差异无统计学意义(P>0.05);重度脂血标本日立7600全自动生化分析仪的检测结果低于罗氏cobas b 123血气分析仪的检测结果,差异有统计学意义(P<0.05)。结论对于重度脂血标本,直接离子选择电极法检测K^+、Na^+、Cl^-的结果更为真实可靠。
基金supported by the National Natural Science Foundation of China(51274028)~~
文摘Direct methanol fuel cells （DMFCs） are promising for use in portable devices because of advantages such as high fuel energy density, low working temperature and low emission of pollutants. Nanotechnology has been used to improve the performance of DMFCs. Catalytic materials composed of small, metallic particles with unique nanostructure supparted on carbons or metal oxides have been widely investigated for use in DMFCs. Despite our increased understanding of this type of fuel cell, many challenges still remain. This paper reviews the current developments of nanostructured elec- trocatalytic materials and porous electrodes for use in DMFCs. In particular, this review focuses on the synthesis and characterization of nanostructured catalysts and supporting materials. Both computational and experimental approaches to optimize mass transportation in porous electrodes of DMFCs, such as theoretical modeling of internal transfer processes and preparation of functional structures in membrane electrode assemblies, are introduced.
文摘Two different poling techniques-corona poling and contact poling in the backdrop of electro-optic （EO） polymer modulators are compared. A 3-layer structure EO polymer modulator is prepared for the poling. The poling setups and procedures of these two different methods are given. It is found that a well-controlled precure step is very critical, otherwise it will result in either lower poling efficiency or damaged film. Experimental results show that contact poling does not create severe surface damage as corona poling and poling voltage is much lower, but corona poling provides higher EO effect than contact poling. Besides, contact poling can provide poling size as large as the substrate size.
