鉬摻雜的鐵鈷三元羥基氧化物的合成及電催化性能研究
發(fā)布時間：2018-12-23 18:19
【摘要】：當前,由于化石燃料的燃燒是獲得能量的主要途徑,造成了環(huán)境污染以及能源日益枯竭的問題,因此開發(fā)清潔能源是當下最迫切的問題。氫氣是當前應用最廣泛的清潔能源,使用電解水制氫也是當前最常用的制取氫能源的途徑。目前,電解水的半反應氧析出反應(OER)是技術(shù)發(fā)展的瓶頸,研究出高電催化性能的催化劑來降低氧析出反應所需要的過電位是當下的研究重點。地殼中含量充足的3d過渡金屬的羥基氧化物表現(xiàn)出高的電催化活性并且經(jīng)濟實惠。我們著手向二元的FeCo羥基氧化物中引入具有高氧化態(tài)的金屬鉬,以提高FeCo羥基氧化物的電催化活性,并嘗試向其中添加高催化活性的物質(zhì)對其的電催化活性進一步進行提高。在本文中,我們使用溶膠-凝膠法分別合成鉬和鎢摻雜的膠體的FeCo羥基氧化物,對二者的OER催化活性進行測定,結(jié)果顯示二者在電催化性能上十分相近,并且OER催化活性很高。并同樣使用溶膠-凝膠法合成不含金屬Mo的FeCo羥基氧化物,且合成具有高催化活性的二元FeCo氫氧化物FeCo LDH,測定二者的電化學性能,通過電化學測試得出鉬的摻雜在很大程度上提高了 FeCo羥基氧化物的活性,并且FeCoMo羥基氧化物在達到電流密度為10mA/cm2時所需的過電位比FeCo LDH低了約78mV,且比目前公認的頂級堿性O(shè)ER催化劑之一的FeCo LDH的性能還高,有實際的投產(chǎn)意義。對合成的膠體FeCoMo羥基氧化物樣品進行高溫退火處理,通過XRD的表征證明其存在Fe、Co、Mo三相的分離。其電催化性能與具有無定形結(jié)構(gòu)的FeCoMo羥基氧化物相比有很大的差距,證明無定形的非晶結(jié)構(gòu)在電催化性能上更有優(yōu)勢,側(cè)面證明了溶膠-凝膠法的優(yōu)越性。為了使FeCoMo羥基氧化物的電催化性能進一步提高,我們向合成的FeCoMo羥基氧化物中原位摻雜具有多活性位點的石墨烯,通過電化學測試發(fā)現(xiàn)石墨烯的摻雜在一定程度上提高了 FeCoMo羥基氧化物的活性。但由于石墨烯價格過高,其摻雜的FeCoMo羥基氧化物還不具有實際投產(chǎn)的意義。
[Abstract]:At present, the burning of fossil fuels is the main way to get energy, which results in environmental pollution and energy depletion, so the development of clean energy is the most urgent problem. Hydrogen is the most widely used clean energy at present. Using electrolytic water to produce hydrogen is also the most commonly used way to produce hydrogen energy. At present, semi-reactive oxygen precipitation reaction (OER) in electrolytic water is the bottleneck of technological development. The research focus is to study the overpotential needed to reduce the oxygen precipitation reaction with high electrocatalytic performance catalyst. The hydroxyl oxides of transition metals with sufficient content in the crust show high electrocatalytic activity and are economical and economical. We began to introduce highly oxidized molybdenum into binary FeCo hydroxyl oxides in order to improve the electrocatalytic activity of FeCo hydroxyl oxides and try to increase the electrocatalytic activity of FeCo hydroxyl oxides by adding high catalytic activity to them. In this paper, the FeCo hydroxyl oxides of molybdenum and tungsten doped colloids were synthesized by sol-gel method, and their OER catalytic activities were determined. The results show that the catalytic activity of OER is very similar and the catalytic activity of OER is very high. FeCo hydroxyl oxides without metal Mo were also synthesized by sol-gel method, and binary FeCo hydroxides with high catalytic activity were synthesized to determine their electrochemical properties. The electrochemical tests show that the doping of molybdenum greatly improves the activity of FeCo hydroxyl oxides, and the overpotential required by FeCoMo hydroxyl oxides when the current density is 10mA/cm2 is about 78 MV lower than that of FeCo LDH. The performance of FeCo LDH is higher than that of FeCo LDH, which is one of the top alkaline OER catalysts. The synthesized colloidal FeCoMo hydroxyl oxide samples were annealed at high temperature and characterized by XRD. It was proved that there were three phase separation of Fe,Co,Mo. Compared with FeCoMo hydroxyl oxides with amorphous structure, its electrocatalytic performance is far from that of amorphous structure, which proves that amorphous structure has more advantages in electrocatalytic performance, and the advantages of sol-gel method are also proved. In order to further improve the electrocatalytic performance of FeCoMo hydroxyl oxides, we doped graphene with multiple active sites into the synthesized FeCoMo hydroxyl oxides. It was found by electrochemical test that the activity of FeCoMo hydroxyl oxides was improved to some extent by graphene doping. However, because of the high price of graphene, its doped FeCoMo hydroxyl oxide has no practical significance.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O643.36
本文編號：2390073
[Abstract]:At present, the burning of fossil fuels is the main way to get energy, which results in environmental pollution and energy depletion, so the development of clean energy is the most urgent problem. Hydrogen is the most widely used clean energy at present. Using electrolytic water to produce hydrogen is also the most commonly used way to produce hydrogen energy. At present, semi-reactive oxygen precipitation reaction (OER) in electrolytic water is the bottleneck of technological development. The research focus is to study the overpotential needed to reduce the oxygen precipitation reaction with high electrocatalytic performance catalyst. The hydroxyl oxides of transition metals with sufficient content in the crust show high electrocatalytic activity and are economical and economical. We began to introduce highly oxidized molybdenum into binary FeCo hydroxyl oxides in order to improve the electrocatalytic activity of FeCo hydroxyl oxides and try to increase the electrocatalytic activity of FeCo hydroxyl oxides by adding high catalytic activity to them. In this paper, the FeCo hydroxyl oxides of molybdenum and tungsten doped colloids were synthesized by sol-gel method, and their OER catalytic activities were determined. The results show that the catalytic activity of OER is very similar and the catalytic activity of OER is very high. FeCo hydroxyl oxides without metal Mo were also synthesized by sol-gel method, and binary FeCo hydroxides with high catalytic activity were synthesized to determine their electrochemical properties. The electrochemical tests show that the doping of molybdenum greatly improves the activity of FeCo hydroxyl oxides, and the overpotential required by FeCoMo hydroxyl oxides when the current density is 10mA/cm2 is about 78 MV lower than that of FeCo LDH. The performance of FeCo LDH is higher than that of FeCo LDH, which is one of the top alkaline OER catalysts. The synthesized colloidal FeCoMo hydroxyl oxide samples were annealed at high temperature and characterized by XRD. It was proved that there were three phase separation of Fe,Co,Mo. Compared with FeCoMo hydroxyl oxides with amorphous structure, its electrocatalytic performance is far from that of amorphous structure, which proves that amorphous structure has more advantages in electrocatalytic performance, and the advantages of sol-gel method are also proved. In order to further improve the electrocatalytic performance of FeCoMo hydroxyl oxides, we doped graphene with multiple active sites into the synthesized FeCoMo hydroxyl oxides. It was found by electrochemical test that the activity of FeCoMo hydroxyl oxides was improved to some extent by graphene doping. However, because of the high price of graphene, its doped FeCoMo hydroxyl oxide has no practical significance.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O643.36
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