碳纳米管改善钛基金属氧化物阳极性能的研究

发布时间：2018-05-11 17:07

  本文选题：Ti/Ru-Ir-Sn氧化物阳极 + 碳纳米管　； 参考：《青岛科技大学》2015年硕士论文

【摘要】：钛基金属氧化物阳极是指在以钛为阳极的基体表面上涂覆金属氧化物的电极,具有电催化活性高、稳定性好等优点。在电解海水防污工程中,普通阳极的析氯活性偏低、使用寿命较短,易导致系统停机等问题,不能满足实际工程中免维护的要求。碳纳米管(CNTs)作为一维纳米材料,具有良好的导电性、电子传递速率,比表面积较大,相对于其它纳米材料,成本较低,广泛地应用在电极修饰、复合材料等材料科学领域。因此,本研究目的是通过掺杂碳纳米管制备钛基金属氧化物阳极,改善阳极在海水电解过程中的析氯活性和稳定性。本文采用热分解法制备含碳纳米管T i/Ru-Ir-Sn氧化物阳极,并通过场发射扫描电子显微镜(FESEM)及能谱仪(EDS)、X射线衍射仪(XRD)研究了涂层的微观形貌、成分和物相；采用极化曲线、循环伏安测试、电化学阻抗谱及强化电解寿命试验等方法研究在海水析氯反应条件下工作的钌系氧化物阳极的析氯电催化活性和耐用性,取得了以下具有实用价值的成果：1)对试验用碳纳米管进行热分析。结果表明：在试验烧结温度470℃条件下,碳纳米管未发生高温氧化分解,仍以单质形式存在于阳极涂层中。2)研究了碳纳米管掺杂量对阳极微观结构的影响。结果表明：不同碳纳米管掺杂量的Ti/Ru-Ir-Sn氧化物阳极,表面均呈现典型的“龟裂状”形貌；掺杂的碳纳米管提高了涂层的活性成分含量,但没有改变(Ru,Ir,Sn)O2固溶体的结构。3)添加碳纳米管可显著改善Ti/Ru-Ir-Sn氧化物阳极的电化学性能。研究表明：阳极活性表面积增大4倍,提高了其析氯电催化活性；强化电解寿命延长3倍,阳极的稳定性得到提高。其中掺杂0.1g·L-1碳纳米管的Ti/Ru-Ir-S n氧化物阳极具有最优的阳极电催化活性和稳定性。4)考察了超声处理、酸化处理等碳纳米管分散工艺对Ti/Ru-Ir-Sn氧化物阳极电化学性能的影响。研究表明：与单一超声分散工艺相比,采用超声+酸化复合分散工艺使碳纳米管分散更加均匀,制备的Ti/Ru-Ir-Sn氧化物阳极涂层具有更小的容抗弧半径,内电阻减小,单位时间内电子交换量最大,阳极寿命得到进一步延长。
[Abstract]:Titanium based metal oxide anode is a kind of electrode coated with metal oxide on the substrate with titanium as anode, which has the advantages of high electrocatalytic activity and good stability. In the electrolytic seawater antifouling project, the chlorination activity of the common anode is low, the service life is short, and the system is easy to be shut down, which can not meet the requirement of no maintenance in the actual engineering. Carbon nanotubes (CNTs), as one-dimensional nanomaterials, have good electrical conductivity, electron transfer rate, large specific surface area, low cost compared with other nanomaterials, and are widely used in materials science fields such as electrode modification, composite materials and so on. Therefore, the purpose of this study is to improve the chlorination activity and stability of titanium based metal oxide anode by doping carbon nanotubes. In this paper, carbon nanotube T i/Ru-Ir-Sn oxide anode was prepared by thermal decomposition method. The microstructure, composition and phase of the coating were studied by field emission scanning electron microscopy (FESEM) and energy spectrometer (EDS-X ray diffractometer). Cyclic voltammetry, electrochemical impedance spectroscopy and enhanced electrolytic life test were used to study the electrocatalytic activity and durability of ruthenium oxide anode working in seawater chlorination reaction. The following practical results were obtained: 1) Thermal analysis of carbon nanotubes was carried out. The results show that at the sintering temperature of 470 鈩，

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