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61.
In the process of Li+ intercalation-deintercalation, electron removal is accompanied simultaneously. Oxygen was found to compensate electron removal both in theoretical calculations and practical experiments. Chlorine addition to LiNi0.7Co0.3O2 was expected to exchange electrons in that Cl− was easier to lose electrons than O2−. LiNi0.7Co0.3O2−xClx was identified as a pure hexagonal lattice of α-NaFeO2 type by X-ray diffraction. X-ray photoelectron spectroscopy was used to analyze the influence of chlorine substitution on the oxidation state of transition-metal ions. Charge-discharge experiments and cyclic voltammetry confirmed that chlorine addition was an effective way to improve reversible capacity and structural stability in cycles. 相似文献
62.
The catalytic activities of WCI6Ph4Sn, MoCl5Ph4Sn and tetrabenzyltitanium were examined in the polymerization of acetylene. The structure, morphology and electrical conductivity of the doped and non doped polyacetylene were also studied. 相似文献
63.
64.
Xiaohong Wang Guanzhong Lu Yun Guo Yuye Xue Liangzhu Jiang Yanglong Guo Zhigang Zhang 《Catalysis Today》2007,126(3-4):412-419
The Si-doped Ce–Zr–O solid solutions have been prepared by the reverse microemulsion method. The effects of Si and its content on the structure characters, thermal-stability and reducibility of the Ce–Zr–O solid solution have been studied by N2 adsorption, XRD, laser Raman (LR), TPR, FT-IR, NMR and XPS methods. The results indicate that, there are the bonds of Si–O–M (Ce or Zr) in the Ce–Zr–Si–O solid solutions, and the presence of Si can increase obviously the surface area, thermal-stability, crystal lattice distortion rate, and reducibility of the solid solution. The surface area of the sample with 20 wt.% Si reaches 153 m2 g−1 after being calcined at 900 °C for 6 h. The Ce–Zr–O solid solution with 5.2–10 wt.% Si shows excellent thermal-stability and reducibility. 相似文献
65.
金属离子掺杂二氧化钛及水体光催化脱氮研究 总被引:2,自引:1,他引:2
采用溶胶-凝胶法制备了掺杂Ce^3+、La^3+、Ag^+、Fe^3+的TiO2光催化剂,以考察其薄膜和粉体形式对水中无机氮的光催化去除效果和活性.用所制备的催化剂对含氨氮-亚硝酸氮的混合液进行了光催化脱氮研究.本文利用UV—Vis吸收光谱、XRD和TEM对催化剂进行了表征.同时,对影响TiO2光催化效率的因素:如掺杂金属离子的种类、浓度、涂膜层数、反应液中有无Fe^2+、不锈钢和玻璃载体、反应器的构型等进行了探讨,并对今后的研究进行展望.经过2h紫外光照射反应,实验最佳脱氮效果:金属离子掺杂TiO2薄膜型催化剂总氮去除率在30%左右,金属离子掺杂粉末型催化剂光催化最高总氮去除率可达41.7%. 相似文献
66.
非金属掺杂的第二代二氧化钛光催化剂研究进展 总被引:13,自引:1,他引:13
寻求廉价、环境友好并具有可见光光催化活性的第二代光催化剂将是光催化发展进一步走向实用化的关键。氮掺杂的TIO2是新发现的具有可见光光催化活性的复合光催化剂,非金属掺杂可以使复合物的复合禁带宽度小于TIO2的禁带宽度,从而使TIO2的吸收边向可见光移动。对TIO2的氮、碳、硫、卤素掺杂国内外研究现状进行了系统评述,分析了提高TIO2可见光活性的原因,指出非金属元素特别是氮元素的阴离子掺杂是在不降低紫外光催化活性的基础上实现可见光响应的较好方法。 相似文献
67.
68.
The PbO2 and F−-doped PbO2 (F-PbO2) film electrodes have been prepared by an electrodeposition process onto platinum substrate. The changes of their electrochemical activity for oxygen evolution (OE) reaction with accelerated electrolysis time have been studied. The results show that the activity of the electrodes decreases with increasing electrolysis time. This can be attributed to the conductivity variations, which are caused by the decrease of the oxygen vacancy concentration in PbO2 films during OE. The mechanism of the decrease of the oxygen vacancies has been investigated. For F-PbO2 film electrodes, though its electrochemical activity is somewhat lower than that of undoped one, its activity stability is much higher in comparison with that of PbO2. The influence of F− doping on the activity of PbO2 film electrodes has been also discussed. 相似文献
69.
报道了单质碘掺杂聚苯胺催化剂I2/PAn的制备,采用正交试验探讨了合成丁酮1,2-丙二醇缩酮的影响因素。实验结果表明,对丁酮1,2-丙二醇缩酮的收率影响最大的是催化剂用量,其次是反应时间和原料摩尔比。碘掺杂聚苯胺催化剂催化合成丁酮1,2-丙二醇缩酮的适宜的反应条件是n(丁酮):n(1,2-丙二醇)=1:1、5,w(催化剂)=0.4%,环己烷为带水剂,反应时间75min。在上述条件下,丁酮1,2-丙二醇缩酮的收率可达80.8%。 相似文献
70.
Effect of Acceptor and Donor Dopants on the Dielectric and Tunable Properties of Barium Strontium Titanate 总被引:1,自引:0,他引:1
Xiaofeng Liang Zhongyan Meng Wenbiao Wu 《Journal of the American Ceramic Society》2004,87(12):2218-2222
The effects of different concentrations of Mn2+ , Mg2+ , Al3+ , Fe3+ , La3+ , and Nb5+ on the dielectric and tunable properties of Ba0.6 Sr0.4 TiO3 ceramics were investigated. It was found that doping in small amounts with acceptor ions such as Mg2+ , Fe3+ , and Al3+ could meliorate the dielectric properties clearly. Decrease of dielectric loss was attributed to the formation of compensating defects originating from acceptor substitution. It was concluded that the tunability was linked to both the dielectric constant and the grain size. A higher figure of merit was obtained by doping the ceramics with smaller ions of Al and Fe, compared to Ti. 相似文献