本文關(guān)鍵詞：鎢基自支持納米結(jié)構(gòu)的制備及其電催化析氫研究　出處：《江蘇大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 析氫反應(yīng) 電解水催化劑 鎢/氧化鎢納米線 硫化鎢納米片 水熱 硫化

【摘要】：氫氣作為一種清潔可再生能源,一直被認(rèn)為是未來最具發(fā)展優(yōu)勢的新能源。由于環(huán)境問題和能源危機(jī)變得越來越嚴(yán)重,關(guān)于電解水制氫的研究變得越來越受歡迎。電解水析氫反應(yīng)是一個吸收能量的過程。因此,催化劑的催化活性在整個析氫反應(yīng)過程中起到至關(guān)重要的作用,而一個性能優(yōu)異的析氫催化劑應(yīng)該具有導(dǎo)電性好、比表面積大、析氫過電勢低、電化學(xué)性能穩(wěn)定和耐腐蝕等特點(diǎn)。目前,Pt等貴金屬催化劑具有優(yōu)異的電解水析氫催化活性,但因其儲存量小、價格昂貴而不能得到商業(yè)上的廣泛應(yīng)用。所以發(fā)展催化活性好的非貴金屬析氫催化劑就顯得尤為重要。本文通過水熱的方法在碳纖維紙上負(fù)載鎢/二氧化鎢納米線(W/WO_2NA@CP)和二硫化物納米片(WS_2 NS@CP)催化劑并對其形貌結(jié)構(gòu)、物相組成和電化學(xué)析氫性能進(jìn)行研究,所得研究結(jié)果如下:(1)提出一種簡單合成W/WO_2 NA@CP的方法。該實(shí)驗(yàn)是通過水熱和熱處理還原的方法將W/WO_2納米線負(fù)載在碳纖維紙上。W/WO_2 NA@CP在析氫反應(yīng)中作為電催化劑。在酸性電解液中,電流密度為20 mA cm-2時所需要的析氫過電位是-340 mV vs.RHE。其法拉第效率接近于100%。并且能夠持續(xù)穩(wěn)定工作54h。以碳纖維紙為基底負(fù)載催化劑,減小W/WO_2內(nèi)部的電子轉(zhuǎn)移電阻。并且催化劑由W和WO_2兩種物質(zhì)組成,W可以提高催化劑本身導(dǎo)電性,而WO_2則可表現(xiàn)出析氫活性。(2)提出一種水熱和低溫硫化共同作用的方法在碳纖維紙上負(fù)載硫化鎢(WS_2)納米片(WS_2 NS@CP)來作為析氫催化劑。WS_2 NS@CP催化劑在酸性電解液中展現(xiàn)出很好的催化活性,當(dāng)電流密度為20和100 mA cm-2時,催化劑的析氫過電位分別為-159和-209 mV vs.RHE。通過比較理論產(chǎn)生氫氣的量和實(shí)際產(chǎn)生氫氣的量可得出析氫效率高達(dá)93%。通過恒電位測量實(shí)驗(yàn)來證明WS_2NS@CP可以在酸性電解液中穩(wěn)定工作25 h。并且通過分析形貌、電化學(xué)阻抗和活性面積來尋找催化劑的最佳硫化條件。本實(shí)驗(yàn)通過硫化的方法將銨基氧化鎢納米線轉(zhuǎn)變?yōu)榱蚧u納米片,這種片狀結(jié)構(gòu)使硫化鎢暴露出更多的活性邊緣從而增強(qiáng)催化劑的析氫活性。本文所引進(jìn)的制備催化劑的方法為設(shè)計(jì)和探索高效析氫催化劑提供了一個方便有效的途徑。
[Abstract]:As a kind of clean and renewable energy, hydrogen has always been regarded as the most promising new energy in the future. Due to environmental problems and energy crisis, it has become more and more serious. The research on hydrogen production from electrolytic water has become more and more popular. The hydrogen evolution of electrolytic water is a process of absorbing energy. Therefore, the catalytic activity of catalyst plays an important role in the whole process of hydrogen evolution. An excellent catalyst for hydrogen evolution should have good conductivity, large specific surface area, low hydrogen evolution potential, stable electrochemical performance and corrosion resistance. Pt and other noble metal catalysts have excellent catalytic activity for hydrogen evolution in electrolytic water, but their storage capacity is small. It is very important to develop non-noble metal hydrogen evolution catalysts with good catalytic activity. In this paper, tungsten / tungsten oxide nanocrystals are loaded on carbon fiber paper by hydrothermal method. Line (. W / WO _ 2NA@ CP) and disulfide nanochip WSS _ 2NSR _ P _ P _ 2 catalyst and their morphology and structure. Phase composition and electrochemical hydrogen evolution were studied. The results of the study are as follows:. A simple synthesis method of W/ WO _ 2 NA@CP is proposed, in which W/ WO _ 2 nanowires are loaded on carbon fiber paper by hydrothermal and heat-treatment reduction. NA@CP acts as an electrocatalyst in hydrogen evolution and in acidic electrolyte. The required hydrogen evolution overpotential at a current density of 20 Ma cm-2 is -340 MV. The Faraday efficiency of vs.RHE. is close to 100 and can work steadily for 54 hours. The catalyst is supported on carbon fiber paper. The electron-transfer resistance in W / WO _ 2 can be reduced, and the conductivity of the catalyst can be improved by the composition of W and WO_2. While WO_2 can exhibit hydrogen evolution activity. (2) A method of hydrothermal and low temperature vulcanization is proposed to support tungsten sulfide WS2 on carbon fiber paper. WS2 NS@CP catalyst showed good catalytic activity in acidic electrolyte. When the current density is 20 Ma and 100mA cm-2. The hydrogen evolution overpotential of the catalyst is -159 and -209 MV, respectively. By comparing the amount of hydrogen produced in theory with the amount of hydrogen produced in practice, the hydrogen evolution efficiency is as high as 933.Through the potentiostatic measurement experiment, it is proved that WS_2NS@CP can be used in acidic electrolyte. Medium-stabilization work 25. H. and by analyzing the morphology. Electrochemical impedance and active area were used to find the best curing conditions of the catalyst. In this experiment, the ammonium based tungsten oxide nanowires were transformed into tungsten sulfide nanowires by the method of vulcanization. This flake structure exposes more active edges of tungsten sulfide and enhances the catalytic activity of the catalyst. The method of preparing catalyst introduced in this paper provides a convenient and effective method for the design and exploration of high efficiency hydrogen evolution catalyst. Means.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB383.1;TQ116.2

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