鎳基和錳基氧化物超級電容器電極材料的研究
發(fā)布時間:2018-10-13 10:51
【摘要】:在過去的幾十年里,作為清潔能源轉換和存儲設備的超級電容器,因其具有高的功率密度,充電時間短,安全可靠性高和很長的循環(huán)使用壽命等特點,引起了研究人員的密切關注和廣泛的研究,F(xiàn)如今,由于過渡金屬氧化物材料成本低廉,礦產(chǎn)資源非常豐富和對環(huán)境污染程度低等特點,其被廣泛用作超級電容器的電極材料,并引起了研究者們極大的興趣。最近,關于鎳鈷復合的氧化物電極材料的研究也越來越多。本研究論文中,我們通過一種簡單的水熱合成法,通過固定乙醇胺的添加量為0.5 ml,煅燒溫度為300℃時,我們成功地制備出了NiO-Ni CoO_2-Co_3O_4復合氧化物電極材料,該復合氧化物材料具有納米片、納米顆粒、納米線三種形貌,且該復合氧化物電極材料具有較高的比電容,其比電容在1.0和10 A/g時分別為990和580 F/g。在10 A/g的電流密度下,經(jīng)過一千次循環(huán)充放電之后其比電容值仍然可以保留最大電容值的50%左右。這表明了NiO-Ni CoO_2-Co_3O_4復合電極材料在高性能儲能系統(tǒng)中有著十分優(yōu)異的應用潛力。因為有非常好的氧化還原性能和較高理論比電容值,這就使得過渡金屬氧化物電極材料在研究的過程中受到了科研工作者們的極大贊同。此外,一些關于NiCoO_2電極材料的制備及其在超級電容器中電化學性能的研究報告也層出不窮。在本研究論文中,我們通過一個簡單的水熱合成法先制備出中間產(chǎn)物,然后再在氮氣氛圍中于350℃的煅燒溫度下成功地合成了納米微球結構的NiCoO_2電極材料。通過三電極測試系統(tǒng)測試其比電容值在1.0和16 A/g的電流密度下分別為760和470 F/g。Ni CoO_2電極材料表現(xiàn)出了良好的循環(huán)穩(wěn)定性,在10 A/g的電流密度下,經(jīng)過一千次的循環(huán)充放電之后,其比電容值仍是最初測試值的87%左右。具有較高的理論比電容值和較好的循環(huán)穩(wěn)定性使得NiCoO_2作為超級電容器電極材料在實際應用中備受期望。在本研究論文中,我們使用了常見的化學試劑,并以簡單的溶膠-凝膠法制備了LaMnO_3粉末,然后對制備的LaMnO_3粉末進行了結構的表征和電化學性能的研究。實驗結果表明,600℃煅燒溫度下的樣品為非晶態(tài),當煅燒溫度在700和800℃時,樣品為純相的La MnO_3粉末。樣品的晶粒尺寸約為80-120 nm,且彼此粘結在一起。對樣品的電化學性能進行測試其結果顯示,700℃煅燒溫度下的LaMnO_3粉末的電化學性能比其他兩個溫度下樣品的電化學性能要好,即在0.5 A/g的電流密度下比電容值為73 F/g。用此方法制備的LaMnO_3粉末,原材料便宜且操作方法簡單。
[Abstract]:In the past few decades, supercapacitors, as clean energy conversion and storage devices, have been characterized by high power density, short charging time, high safety and reliability, and long cycle life. Has caused the researcher's close attention and the extensive research. Nowadays, transition metal oxide materials are widely used as electrode materials for supercapacitors due to their low cost, rich mineral resources and low environmental pollution. Recently, more and more research has been done on nickel-cobalt composite oxide electrode materials. In this paper, we successfully prepared the NiO-Ni CoO_2-Co_3O_4 composite oxide electrode material by a simple hydrothermal synthesis method and a fixed amount of ethanolamine (0.5 ml,) calcined at 300 鈩,
本文編號:2268346
[Abstract]:In the past few decades, supercapacitors, as clean energy conversion and storage devices, have been characterized by high power density, short charging time, high safety and reliability, and long cycle life. Has caused the researcher's close attention and the extensive research. Nowadays, transition metal oxide materials are widely used as electrode materials for supercapacitors due to their low cost, rich mineral resources and low environmental pollution. Recently, more and more research has been done on nickel-cobalt composite oxide electrode materials. In this paper, we successfully prepared the NiO-Ni CoO_2-Co_3O_4 composite oxide electrode material by a simple hydrothermal synthesis method and a fixed amount of ethanolamine (0.5 ml,) calcined at 300 鈩,
本文編號:2268346
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