【作者】 王清泉；

【导师】 刘贵昌；

【作者基本信息】 大连理工大学 ， 化学工程， 2006， 硕士

【摘要】 本文尝试采用了掺杂和梯度中间层方法来制各钛基金属多元氧化物-稀土阳极,并对制备出的阳极和传统方法制备的阳极的结构和性能进行了分析和比较。 论文研究了掺杂Ir、Sn、Co、Ce、La元素的阳极涂层的电化学性能。分析结果表明:（1） 掺杂Ir、Sn、Co均能明显提高析氯、析氧电位差和延长阳极寿命。其中掺杂Ir元素对阳极析氯、析氧电位差和阳极使用寿命增加最多,综合性能最佳。（2） 掺杂适量的稀土元素Ce（摩尔分数0.3）、La（摩尔分数0.5）均能降低阳极析氯电位,但掺杂La比Ce析氯电位更低,析氧电位更高。（3） 掺杂适量稀土元素降低析氯电位的机理在于,掺杂适量稀土元素能降低阳极氧化物与溶液界面电阻,从而提高电极电催化性能,XRD分析表明La元素以氧化物LaRuO₃固熔体的形式存在;（4） 掺杂稀土DSA的最佳工艺条件为450℃,涂刷15次。 论文还研究了中间层对DSA性能和表面形貌的影响,结果表明添加Ir中间层能提高析氯、析氧电位差,延长阳极寿命,减少涂层裂缝。在此基础上,实验将掺杂稀土La元素、Ir元素及梯度法结合起来,制备出性能优良的钛基金属多元氧化物-稀土阳极。采用析氯析氧曲线、SEM、电子探针、强化寿命测试、交流阻抗谱测试等方法对所制备的阳极涂层的结构、表面形貌、性能等进行了分析,分析结果表明:（1） 采用梯度法制备的RuIrTiLa阳极涂层与普通涂刷法制备的龟裂型涂层相比,裂缝窄且短,分布不连续,此结构有利于延长阳极寿命;（2） 采用梯度中间层法制备的RuIrTiLa阳极涂层保留了普通涂刷法制备的阳极涂层的析氯电位低的优点。说明电极起电催化作用的是电极表面涂层,与涂层内层成分关系不大;（3） 阳极寿命测试结果为近40h,进一步验证了梯度法制备的阳极裂缝窄且短的结构具有使用寿命长的优点。（4） EDX定点元素面分析表明:各元素在涂层中分布较均匀,说明溶液涂覆法制备阳极涂层是合适的。（5）采用Rs（R₁Q₁）（R₂Q₂）L等效电路模型对阳极涂层的交流阻抗谱进行拟合,测量值和拟合值拟合的很好,说明选择的等效电路是合适的。更多还原

【Abstract】 Ti-base Metal oxide Anode coatings doping with Rare Earth were prepared by means of adulterating and grads mesosphere .Anode coatings prepared by such means were compared with anode coatings prepared by traditional means in construct and various properties.The paper discussed the electrochemistry properties of anode coating doping with Ir Sn Co Ce La elements .The results indicated that: (1) Chlorine evolution of anode coating was heightened a little,but anode life increased more than double.(2)Doping suitable Rare Earth Ce(0.3),La(0.5) can reduce potention chlorine evolution,and doping La(0.5) potential chlorine evolution was lower than Ce(0.3).(3)The mechanism of reduce potential chlorine evolution is that doping suitable Rare Earth can reduce interface resistance between anode and solution;XRD testing indicated that La exist in coating as LaRuO3. (4)The best preparation process of anode coating doping with Rare earth is :450℃, coating 15 times.The effects of interlayer to electrochemistry properties and surface of anode coating were also investigated. The results indicated that anode coating with interlayer have more difference between potential chlorine evolution and potential oxygen evolution ,less coating crack and longer anode life.On the basic of above work, Ti-base Metal oxide Anode coatings which properties is excellent ,were prepared by means of combining doping Rare Earth and Ir element with grads .Through testing structure,surface,properties of anode coating and so on,it is indicated that:(l)Anode coating prepared by grads means had more thin and shorter cracks than that prepared by tradition coating means,which is be propitious to increase anode life;(2) RuIrTiLa prepared by grads means had the same excellence of low chlorine evolution compared with prepared by tradition coating.It is indicated that the elements of coating surface is very important for property of electro-catalyze react which had nothing with elements inner anode coating.(3)Anode life is about 40h,which is more than double of anode life prepared by traditional means in . It validated that the structure of more thin and shorter cracks prepared by grads means having longer life.(4) The fixed-point surface constitution scan(EDX) of Anode coating indicated that elements were uniformity in coating,which account for solution coating means was adapt to prepared anode coating. (5) EIS simulated with Rs (R1Q1) (R2Q2) L.The measurement simulated very well,which indicate Rs (R1Q1) (R2Q2) L was suitable.更多还原