發(fā)布時(shí)間：2018-06-05 23:45

  本文選題：陽極催化劑 + FeCoNi��； 參考：《西安科技大學(xué)》2017年碩士論文

【摘要】：氫氣被認(rèn)為是最理想的綠色能源之一。在電解水制氫中,高的析氧過電位是導(dǎo)致電解過程中能量轉(zhuǎn)化率低的一個(gè)重要原因,因此研究和開發(fā)高性能陽極催化材料,降低陽極過電位是目前電解水研究的一個(gè)重要課題。本論文選取廉價(jià)易得的過渡金屬與特殊的泡沫基底復(fù)合,制備出FeCoNi/泡沫鎳和Cu納米線/泡沫銅陽極催化材料,進(jìn)行電解水制氫研究。同時(shí),還利用了電催化性能好的FeOOH與半導(dǎo)體W03相復(fù)合,制備出W03/FeOOH光陽極材料,進(jìn)行光電分解水制氫研究。研究結(jié)果對(duì)于(光)電化學(xué)分解水陽極催化劑的制備和應(yīng)用有一定的理論意義。主要研究結(jié)果如下:(1)選取泡沫鎳作為基底,利用一步電化學(xué)沉積法制備出三元FeCoNi復(fù)合陽極材料。采用XRD,XPS,FESEM,EDS,TEM和電化學(xué)測(cè)試對(duì)復(fù)合陽極材料進(jìn)行了系統(tǒng)的表征和研究。結(jié)果表明,當(dāng)外加電位為1.55V(vs.RHE)時(shí),FeCoNi的電流密度可達(dá)到126.90mA/cm~2。并在連續(xù)電解8h后,FeCoNi的電流密度無明顯衰減。(2)選取泡沫銅作為基底,利用化學(xué)浸泡結(jié)合電化學(xué)陰極化制備出Cu納米線陽極材料。采用XRD,FESEM和電化學(xué)測(cè)試對(duì)陽極材料進(jìn)行了系統(tǒng)的表征和研究。研究表明,當(dāng)外加電位為1.80V(vs.RHE)時(shí),Cu納米線的電流密度可以達(dá)到214mA/cm~2。并在連續(xù)電解2,000 s后,Cu納米線的電流密度可以保持最初值的84%左右。(3)選取導(dǎo)電玻璃作為基底,利用滴涂-熱處理法結(jié)合電化學(xué)沉積制備出W03/FeOOH光陽極材料。采用XRD,FESEM,UV-VisDRS,IPCE和光電化學(xué)測(cè)試對(duì)復(fù)合陽極材料進(jìn)行了系統(tǒng)的表征和研究。研究表明,當(dāng)外加電壓為1.23 V(vs.RHE)時(shí),W03/FeOOH的電流密度可達(dá)到0.67 m/A/cm~2(光強(qiáng)為100 mW/cm~2),其電流密度為單純W03的2倍。并在連續(xù)光照3 h后,WO_3/FeOOH的光電流密度可以保持最初值的88%左右。采用EIS和MS測(cè)試分析了光電化學(xué)分解水制氫性能增強(qiáng)的原理,提出了光電化學(xué)分解水制氫的反應(yīng)機(jī)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.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ116.2;TQ426

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 吳川,張華民,衣寶廉;化學(xué)制氫技術(shù)研究進(jìn)展[J];化學(xué)進(jìn)展;2005年03期

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本文編號(hào)：1983948