Electrochemistry of NaK2C12 in lithium-containing electrolytes and its use in lithium-ion cells☆

The electrochemistry of NaK₂C₁₂ in 1 M LiClO₄ EC-DMC solutions has been studied. The results show that, upon oxidation, NaK₂C₁₂ irreversibly releases one mole of potassium ions. The resulting composite electrode, that appears to be a mixture of graphite and Na–K alloy, is capable to reversibly intercalate lithium up to LiC₆ with fast rate. The compound can be used in lithium-ion cells with partially lithiated cathodes such as LiMn₂O₄, resulting in a two plateaus cell operating in the Li_1+xMn₂O₄ and Li_1−xMn₂O₄ regions.     

On Long Minimal Zero Sequences in Finite Abelian Groups

Periodica Mathematica Hungarica -     

Ni/Al2O3催化剂表面状态对CH4氧化反应的影响

采用瞬变响应技术研究了常压700℃条件下气相O2、Ni/Al2O3催化剂表面上可逆吸附氧物种及催化剂的表面状态对CH4吸附、反应以及CH4部分氧化反应的影响,同时也对CH4部分氧化制合成气反应过程中催化剂表面所处的状态进行了研究.结果表明,如果催化剂表面处于氧化态,CH4不能吸附分解,只能通过RidealEley机理与催化剂表面的吸附氧进行非选择性氧化反应,这将严重影响CH4的转化和目的产物H2、CO的选择性.只有在还原的催化剂上,CH4部分氧化制合成气反应才能高转化、高选择性地进行.在CH4部分氧化制合成气反应过程中,催化剂表面处于还原态,不存在多余的中间氧物种NiO,但存在少量的碳物种,这有利于保持催化剂的还原态和抑制CO2的生成.     

ZSM-5沸石膜的吸附表征

The framework and thickness of synthesized ZSM-5 membranes were characterized using static and dynamic adsorption methods. It is shown that the adsorptive properties of the membranes are the same as ZSM-5 zeolite, the average thickness of the membranes was 13 μm calculated from the adsorptive ability, which matched very well with the result measured by scanning electron micrograph. The results also shown that zeolite membranes have greated adsorptive ability than zeolite powders. The high Si/Al rate zeolite membranes have selective ability on ethanol/water, and this interpreted the separation of ethanol-water mixtures with the membranes.     

氟氯酰与正癸烷反应的瞬态光谱和机理探索研究

氟氯酰(ClF3 O)是一种极强的氟化剂和氧化剂,极易与水和有机物发生爆炸性反应.目前关于氟氯酰与水以及有机物等物质的反应机理不多见,氟氯酰与水以及有机物等物质由反应物变成产物的过程有待研究.采用ICCD瞬态光谱测量系统,实时拍摄到无氧和有氧环境下氟氯酰和正癸烷反应的瞬态发射光谱;采用量子化学理论方法对氟氯酰和正癸烷的...