首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2篇
  物理学   2篇
  2001年   1篇
  1984年   1篇
排序方式: 共有2条查询结果,搜索用时 93 毫秒
1
1.
Rare earth cuprates as electrocatalysts for methanol oxidation   总被引:9,自引:0,他引:9  
A series of rare earth cuprates with overall composition Ln2−xMxCu1−yMy′O4−δ (where Ln=La and Nd; M=Sr, Ca and Ba; M′=Ru and Sb: 0.0≤x≤0.4 and y=0.1) have been tested as anode electrocatalysts for methanol oxidation. The evaluation of electrode kinetic parameters was made galvanostatically. The catalyst characterization was carried out by specific conductivity measurements, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Iodometry. These materials exhibit significant activity for methanol oxidation at higher potentials. The linear correlation between Cu(3+) content and methanol oxidation activity suggests that the active sites for adsorption of methanol is Cu(3+). The methanol oxidation onset potential depends on the ease of Cu(2+)→Cu(3+) oxidation reaction. These materials show better tolerance towards the poisoning by the intermediates of methanol oxidation compared to that of conventional noble metal electrocatalysts (supported and bulk). The lattice oxygen in these oxides could be considered as active oxygen to remove CO intermediates of methanol oxidation reaction.  相似文献
2.
Auger Electron Spectroscopy and X-ray Photoelectron Spectroscopy were applied to the study of thin films formed by transpassive dissolution of nickel in a nitrate electrolyte and by exposure of mechanically polished nickel to air. Variation of take-off angle and sputter profiling were used to determine the thickness and chemical composition of these films. Transpassive films are found to be thicker and different in composition than air formed films. Nitrogen present in the metal-oxide interface of the transpassive film is in a reduced state.  相似文献
1
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号