本文關(guān)鍵詞：過渡金屬氧化物納米材料結(jié)構(gòu)與光電化學(xué)性能研究　出處：《中國科學(xué)技術(shù)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： X射線吸收精細結(jié)構(gòu) 光電催化 MoO_3納米材料 Cu_2O納米材料

【摘要】：全球能源短缺和環(huán)境污染危機使得發(fā)展環(huán)境友好型新能源成為世界性課題。太陽能相比于其它常見能源來說具有環(huán)境友好,無污染且用之不盡取之不竭,有效功率巨大等優(yōu)點,然而,如何有效地利用太陽能是目前面臨的一個巨大挑戰(zhàn)。將太陽能轉(zhuǎn)化為化學(xué)能是光電化學(xué)領(lǐng)域的一個主要研究課題,而過渡金屬氧化物因其優(yōu)良的光電性能成為了一種具有極具發(fā)展?jié)撃艿墓怆姶呋瘎┎牧?但過渡金屬氧化物存在著較短的電子擴散長度和緩慢的電子遷移率,因此存在光生電子空穴對難于有效分離的問題極待解決。在本論文中,我們通過水熱法成功制備了非晶氧缺陷三氧化鉬納米球顆粒,其結(jié)構(gòu)中的氧缺陷導(dǎo)致樣品在可見至近紅外波段有很強的等離子體吸收響應(yīng),成功抑制了半導(dǎo)體內(nèi)光生載流子的復(fù)合,提高了其光響應(yīng)電流;探索了氧化亞銅納米片半導(dǎo)體材料的合成和光電化學(xué)催化性能。論文利用同步輻射X射線吸收譜(XAFS)、X射線衍射(XRD)、掃描電子顯微鏡(SEM)、透射電鏡(TEM)和X射線光電子能譜(XPS),光電化學(xué)平臺等性能實驗方法,研究了上述過渡金屬氧化物材料原子結(jié)構(gòu)和性能之間的關(guān)系。本論文主要研究內(nèi)容如下:1、利用水熱法合成了非晶態(tài)氧缺陷MoO3-x納米球顆粒(A-MoO3-x)。該A-MoO3-x納米球在可見及近紅外波長區(qū)域有較強的等離子吸收效應(yīng),提高了太陽光的利用效率。該材料在光電催化水氧化實驗中可作為一種有效的陽極材料,相比塊狀三氧化鉬顆粒,A-MoO3-x納米球樣品具有更高的光電流密度。XAFS表征結(jié)果顯示了材料中的氧缺陷使得非晶A-MoO3-x樣品在局域結(jié)構(gòu)呈現(xiàn)亞穩(wěn)態(tài)六角結(jié)構(gòu),極大得提高了光生電荷分離效率。A-MoO3-x材料的等離子體吸收和非晶結(jié)構(gòu)提高了其作為光電化學(xué)產(chǎn)氧的活性。2、利用水熱法成功合成了 Cu20超薄納米片材料。在光電化學(xué)催化性能測試結(jié)果中,其光反應(yīng)響應(yīng)結(jié)果相比塊材料Cu2O顆粒,具有更高的光電流響應(yīng)密度,表明了合成的Cu20納米片具有更好的光電催化產(chǎn)氫性能。
[Abstract]:The global energy shortage and environmental pollution crisis make the development of environment-friendly new energy become a worldwide issue. Compared with other common energy, solar energy is environmentally friendly, pollution-free and inexhaustible. However, how to make effective use of solar energy is a great challenge at present. Converting solar energy into chemical energy is a major research topic in the field of photochemistry. Transition metal oxide (TME) has become a potential photocatalyst because of its excellent photoelectric properties, but the transition metal oxide has short electron diffusion length and slow electron mobility. Therefore, the problem of photoelectron hole is difficult to be effectively separated. In this thesis, we successfully prepared amorphous oxygen defect molybdenum trioxide nanospheres by hydrothermal method. The oxygen defect in the structure leads to a strong plasma absorption response in the visible to near infrared band, which successfully inhibits the recombination of photogenerated carriers in the semiconductor and improves the photoresponse current. The synthesis and photochemical catalytic properties of cuprous oxide nanocrystalline semiconductor materials were investigated in this paper. The synchrotron radiation X-ray absorption spectra (XAFS) and X-ray diffraction (XRD) were used. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), photochemical platform and so on. The relationship between atomic structure and properties of the transition metal oxide materials mentioned above has been studied. The main contents of this thesis are as follows: 1. Amorphous oxygen defect MoO3-x nanospheres (A-MoO _ 3-x) were synthesized by hydrothermal method. The A-MoO _ 3-x nanospheres have strong plasma absorption effect in the visible and near infrared wavelength regions. This material can be used as an effective anode material in photocatalytic water oxidation experiments, compared with bulk molybdenum trioxide particles. A-MoO _ 3-x nanospheres have higher photocurrent density. XAFS characterization results show that oxygen defects in the material make the amorphous A-MoO _ 3-x sample have metastable hexagonal structure in the local structure. . The plasma absorption and amorphous structure of the photogenerated charge separation efficiency. A-MoO _ 3-x have been greatly improved. The ultrathin Cu20 nanocrystals were successfully synthesized by hydrothermal method. In the photochemical catalytic performance test results, the photoreaction response results were compared with the Cu2O particles. The photocurrent response density is higher, which indicates that the synthesized Cu20 nanocrystals have better photocatalytic hydrogen production performance.
【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB383.1;O611.62

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