本文選題：電催化　切入點(diǎn)：析氫反應(yīng)　出處：《西北大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：當(dāng)前,能源與環(huán)境的問(wèn)題已經(jīng)影響到了人類的生存和發(fā)展。因此,開(kāi)發(fā)出新型的環(huán)保能源以取代傳統(tǒng)化石燃料是解決這些問(wèn)題的必由之路。氫能,是一種能量密度高、環(huán)保、來(lái)源豐富、可再生的新能,被視作取代傳統(tǒng)化石燃料的一種理想燃料。目前已經(jīng)發(fā)現(xiàn)的方法中電催化析氫因產(chǎn)量高且環(huán)保從而受到了大家的關(guān)注。但是已知的性能最好的催化劑Pt儲(chǔ)備量太少以及價(jià)格太高。因而限制了這種制氫方法的推廣。所以,開(kāi)發(fā)出廉價(jià)高效的催化劑就是解決問(wèn)題的關(guān)鍵。目前研究的非貴金屬催化劑中,有大量的物質(zhì)被發(fā)現(xiàn)具有作為電催化析氫催化劑的能力。其中Mo基材料因性能優(yōu)異而備受關(guān)注。在本論文中,我們將從鉬基材料的角度入手,合成一系列具有一定形貌的鉬基的純化合物及鉬基的雜化材料。然后對(duì)它們的電催化性能進(jìn)行測(cè)試分析。論文的研究主要有以下的三個(gè)部分:(1)采用一個(gè)簡(jiǎn)單的(NH_4)_6Mo_7O_24與胺的合成思路,制造出具有一維棒狀結(jié)構(gòu)的MoO_3-EDA。我們對(duì)其在空氣中灼燒,再在Ar/H2氣氛中還原,得到了具有二維結(jié)構(gòu)的MoO_2。在催化析氫的測(cè)試中,600℃條件下獲得的材料因其較好的結(jié)晶性而擁有較好的性能,在過(guò)電勢(shì)為300mV時(shí)達(dá)到15mA/cm2的電流密度。同時(shí)它也具備了很好的穩(wěn)定性。(2)基于一維MoO_3-EDA,我們合成出一維MoO_2納米棒。然后我們通過(guò)水熱的方法在其表面復(fù)合上一層MoS_2。在催化性能測(cè)試中MoO_2-MoS_2雜化納米棒展現(xiàn)出了明顯優(yōu)于MoO_2的性能。其中樣品MoO_2/S-12-3性能最好,在過(guò)電勢(shì)為-210mV時(shí),電流密度為10mA/cm2。同時(shí)它也具備很好的穩(wěn)定性。(3)我們?cè)谶�原氣氛中高溫處理MoO_3-EDA,在不同的處理溫度下得到一維的MoC以及一系列一維的Mo/MoC。在析氫的測(cè)試中,Mo/MoC展現(xiàn)出了更優(yōu)于MoC的能力,其中Mo/MoC(700℃)在過(guò)電勢(shì)為-200mV時(shí)電流密度能達(dá)到51.5 mA/cm2,說(shuō)明這種雜化結(jié)構(gòu)確實(shí)提升了性能。在催化穩(wěn)定性的測(cè)試中,它也表現(xiàn)出了良好的性能。
[Abstract]:At present, the problems of energy and environment have affected the survival and development of human beings. Therefore, it is the only way to solve these problems to develop new environmental energy to replace the traditional fossil fuels. Hydrogen energy is a kind of high energy density and environmental protection. A rich source of renewable new energy, It is regarded as an ideal alternative to traditional fossil fuels. Electrocatalytic hydrogen evolution has attracted much attention because of its high production and environmental protection. But the best known catalyst Pt reserve is too high. Less and too expensive. This limits the promotion of this hydrogen production process. Developing cheap and efficient catalysts is the key to solving the problem. A large number of substances have been found to have the ability to act as catalysts for electrocatalytic hydrogen evolution. Mo-based materials have attracted much attention because of their excellent performance. In this paper, we will proceed from the perspective of molybdenum based materials. A series of molybdenum based pure compounds and molybdenum based hybrid materials were synthesized and their electrocatalytic properties were tested and analyzed. The synthesis of amines, We make Moo _ s _ 3-EDAs with one-dimensional rod structures. We burn them in the air and restore them in the Ar/H2 atmosphere. Moo _ 2 with 2-D structure was obtained. The materials obtained at 600 鈩，

本文編號(hào)：1600539