NiAl、CoAl與NiCoAl氫氧化物的結(jié)構(gòu)和電化學(xué)性能比較
發(fā)布時(shí)間:2018-01-14 04:27
本文關(guān)鍵詞:NiAl、CoAl與NiCoAl氫氧化物的結(jié)構(gòu)和電化學(xué)性能比較 出處:《無(wú)機(jī)材料學(xué)報(bào)》2016年11期 論文類(lèi)型:期刊論文
【摘要】:采用尿素分解法制備了NiAl、CoAl及NiCoAl三種氫氧化物。經(jīng)XRD、FT-IR、SEM、XPS和N2吸脫附等方法對(duì)樣品進(jìn)行結(jié)構(gòu)和形貌表征,結(jié)果表明:三種材料都為類(lèi)水滑石結(jié)構(gòu),形貌各不相同,NiCoAl氫氧化物的比表面積最小,其中Ni和Co元素都以二價(jià)的形式存在。通過(guò)循環(huán)伏安(CV)、恒電流充放電(GCD)、交流阻抗對(duì)樣品的電化學(xué)性能進(jìn)行評(píng)估,結(jié)果表明:電流密度為0.6A/g時(shí),NiAl、CoAl、NiCoAl電極的比電容分別為468、507、929F/g,電流密度為6A/g,經(jīng)3000次恒電流充放電測(cè)試后,三種電極比電容的保持率分別為30%、36%、40%。這說(shuō)明,NiCoAl氫氧化物具有優(yōu)于其它兩種材料的電化學(xué)性能。
[Abstract]:NiAl prepared by the decomposition of urea, CoAl and NiCoAl three kinds of hydroxide. By XRD, FT-IR, SEM, XPS and N2 adsorption desorption method of structure and morphology of samples, the results showed that the three materials are hydrotalcite like structure, morphology of different NiCoAl hydroxide minimum surface area. The Ni and Co elements with two valence form. By cyclic voltammetry (CV), constant current charge discharge (GCD), AC impedance electrochemical properties of the samples were evaluated, the results show that the current density is 0.6A/g, NiAl, CoAl, the specific capacitance of the NiCoAl electrode was 468507929F/g, the current density is 6A/g after 3000 times, galvanostatic charge discharge test, three kinds of electrodes to keep rates were 30%, the specific capacitance of 36% 40%. this shows that the electrochemical performance of NiCoAl is better than that of the other two kinds of hydroxide materials.
【作者單位】: 蘭州理工大學(xué)石油化工學(xué)院應(yīng)用化學(xué)系;
【基金】:國(guó)家自然科學(xué)基金(51503092)~~
【分類(lèi)號(hào)】:O646;TM53
【正文快照】: 超級(jí)電容器作為一種新的儲(chǔ)能器件具有充放電快、循環(huán)壽命長(zhǎng)、功率密度高和使用溫度范圍寬等特點(diǎn)被廣泛應(yīng)用于國(guó)防、鐵路、電動(dòng)汽車(chē)、電子、通訊、航空航天等領(lǐng)域[1]。超級(jí)電容按照儲(chǔ)能機(jī)理的不同可分為雙電層電容和法拉第電容,前者是利用電子和離子或偶極子在電極/溶液界面的,
本文編號(hào):1422049
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