电解水阳极催化剂的制备及性能研究

发布时间：2018-06-05 23:45

本文选题：阳极催化剂 + FeCoNi　；参考：《西安科技大学》2017年硕士论文

【摘要】：氢气被认为是最理想的绿色能源之一。在电解水制氢中,高的析氧过电位是导致电解过程中能量转化率低的一个重要原因,因此研究和开发高性能阳极催化材料,降低阳极过电位是目前电解水研究的一个重要课题。本论文选取廉价易得的过渡金属与特殊的泡沫基底复合,制备出FeCoNi/泡沫镍和Cu纳米线/泡沫铜阳极催化材料,进行电解水制氢研究。同时,还利用了电催化性能好的FeOOH与半导体W03相复合,制备出W03/FeOOH光阳极材料,进行光电分解水制氢研究。研究结果对于(光)电化学分解水阳极催化剂的制备和应用有一定的理论意义。主要研究结果如下:(1)选取泡沫镍作为基底,利用一步电化学沉积法制备出三元FeCoNi复合阳极材料。采用XRD,XPS,FESEM,EDS,TEM和电化学测试对复合阳极材料进行了系统的表征和研究。结果表明,当外加电位为1.55V(vs.RHE)时,FeCoNi的电流密度可达到126.90mA/cm~2。并在连续电解8h后,FeCoNi的电流密度无明显衰减。(2)选取泡沫铜作为基底,利用化学浸泡结合电化学阴极化制备出Cu纳米线阳极材料。采用XRD,FESEM和电化学测试对阳极材料进行了系统的表征和研究。研究表明,当外加电位为1.80V(vs.RHE)时,Cu纳米线的电流密度可以达到214mA/cm~2。并在连续电解2,000 s后,Cu纳米线的电流密度可以保持最初值的84%左右。(3)选取导电玻璃作为基底,利用滴涂-热处理法结合电化学沉积制备出W03/FeOOH光阳极材料。采用XRD,FESEM,UV-VisDRS,IPCE和光电化学测试对复合阳极材料进行了系统的表征和研究。研究表明,当外加电压为1.23 V(vs.RHE)时,W03/FeOOH的电流密度可达到0.67 m/A/cm~2(光强为100 mW/cm~2),其电流密度为单纯W03的2倍。并在连续光照3 h后,WO_3/FeOOH的光电流密度可以保持最初值的88%左右。采用EIS和MS测试分析了光电化学分解水制氢性能增强的原理,提出了光电化学分解水制氢的反应机理。
[Abstract]:Hydrogen is considered to be one of the most ideal green energy sources. High oxygen evolution overpotential in electrolysis water is an important cause of low energy conversion in electrolysis process. Therefore, it is an important issue to study and develop high performance anode catalysis materials to reduce anodic overpotential is an important topic in the study of electrolysis at present. The FeCoNi/ foam nickel and Cu nanowire / foam copper anode catalyst were prepared by the combination of the transition metal and the special foam substrate. The study of hydrogen production by electrolyzed water was carried out. At the same time, the W03/FeOOH photoanode material was prepared by the combination of the good electrocatalytic properties of FeOOH and the semiconductor W03, and the study of hydrogen production by photoelectric decomposition was carried out. The preparation and application of electrochemical decomposition of water anode catalyst have some theoretical significance. The main results are as follows: (1) three element FeCoNi composite anode materials were prepared by one step electrochemical deposition method with nickel foam as the substrate. The composite anode materials were characterized by XRD, XPS, FESEM, EDS, TEM and electrochemical testing. The results show that, when the applied potential is 1.55V (vs.RHE), the current density of FeCoNi can reach 126.90mA/cm~2. and the current density of FeCoNi is not attenuated after continuous electrolysis of 8h. (2) copper foam is selected as the substrate and Cu nanowire anode materials are prepared by chemical soaking and electrochemical cathodic cathodic. XRD, FESEM and electrochemical testing are used. The anode material is characterized and studied systematically. The study shows that the current density of the Cu nanowires can reach 214mA/cm~2. when the applied potential is 1.80V (vs.RHE), and the current density of the Cu nanowires can be kept about 84% after 2000 s continuous electrolysis. (3) the conductive glass is selected as the substrate and the coating heat treatment process is used. W03/FeOOH photoanode materials were prepared by electrochemical deposition. The composite anode materials were systematically characterized and studied by XRD, FESEM, UV-VisDRS, IPCE and photoelectrochemical tests. The study showed that when the applied voltage was 1.23 V (vs.RHE), the current density of W03/FeOOH could reach 0.67 m/A/cm~2 (100 mW/cm~2), and the current density was single. 2 times of pure W03. After 3 h of continuous light, the photocurrent density of WO_3/FeOOH can keep about 88% of the initial value. The principle of the enhancement of hydrogen production by optoelectronic chemical decomposition water is analyzed by EIS and MS tests, and the reaction mechanism of hydrogen production by photochemical decomposition of water is proposed.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ116.2;TQ426

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