| 第 48 卷第 3 期 |  | Vol. 48 No. 3 | | 2018 年 6 月 | Jun 2018 |
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所屬欄目：功能材料
水熱法制備α-MoO3煅燒對其結構、電容性能影響研究 |
| 牛 彥，陳志萍*，楊曉峰，孔德兵，毛貝貝，張越鵬
（中北大學(xué) 理學(xué)院 化學(xué)學(xué)科部，山西 太原 030051） |
| 摘 要：以鉬酸銨和濃硝酸為原料，采用一步水熱法成功制備了α-MoO3。通過(guò)Raman、FT-IR、XRD、FESEM探究了600℃煅燒對α-MoO3結構、形貌的影響。用循環(huán)伏安法（CV）、恒流充放電（GCD）和電化學(xué)阻抗譜（EIS）對煅燒前后α-MoO3的電容特性進(jìn)行研究。結果表明：煅燒后α-MoO3的粒徑和晶面間距變大，Mo-O鍵的極化率和粒子的結晶度提高。煅燒后α-MoO3的電荷轉移電阻較煅燒前明顯減�。≧ct=1.6 Ω），且表現出更加明顯的贗電容特性。以0.5 mol·L-1 Li2SO4為電解液，在0.5 A·g-1的電流密度下，煅燒后α-MoO3的比電容較煅燒前提高了100.5%，達到163.56 F·g-1。由煅燒后α-MoO3制備的電極經(jīng)1 000次循環(huán)，電容保持率為87.5 %，表現出好的循環(huán)穩定性。 |
| 關(guān)鍵詞：電容性能；α-MoO3；煅燒；比電容 |
| 中圖分類(lèi)號：O646.54；TM912.9 文獻標識碼：A 文章編號：1009-9212（2018）03-0049-06 |
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| Effect of Calcining on Structure and Capacitance Properties of α-MoO3 Prepared by Hydrothermal Method |
| NIU Yan, CHEN Zhi-ping*, YANG Xiao-feng, KONG De-bing, MAO Bei-bei, ZHANG Yue-peng
(School of Science, North University of China, Taiyuan 030051, China) |
| Abstract：Using ammonium molybdate and concentrated nitric acid as raw materials, α-MoO3 was successfully prepared by one-step hydrothermal method and calcined in a muffle furnace at 600℃. The effects of calcination on the structure and morphology of α-MoO3 were investigated using Raman, FT-IR, XRD and FESEM. The capacitance properties of α-MoO3 before and after calcination were studied by cyclic voltammetry (CV), galvanostatic charge-discharge(GCD) and electrochemical impedance spectroscopy(EIS). The results showed that the particle size and interplanar spacing of α-MoO3 became larger, the polarizability of Mo-O bond and the crystallinity of the particles increased after calcination. After calcined, the charge transfer resistance of α-MoO3 was significantly reduced (Rct=1.6) compared with that before calcination, and the pseudocapacitance properties were more pronounced. With 0.5 M Li2SO4 as electrolyte, the specific capacitance of α-MoO3 after calcination was 100.5% higher than that before calcination, reaching 163.56 F·g-1，at a current density of 0.5 A·g-1. The electrode prepared from calcined α-MoO3 was subjected to 1000 cycles, and the capacitance retention rate was 87.5%, showing good cycle stability. |
| Key words：capacitance properties; α-MoO3; calcining; specific capacitance |
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基金項目：山西省留學(xué)人員科技活動(dòng)擇優(yōu)資助項目（2016），山西省131領(lǐng)軍人才項目（2016），山西省自然科學(xué)基金項目（2015011025）。
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作者簡(jiǎn)介：牛 彥（1993-），女，山西定襄人，碩士研究生，研究方向：電極材料的制備（E-mail：996920382@qq.com）。
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聯(lián) 系 人：陳志萍，副教授，研究方向：功能材料制備及性能（E-mail：Zhipingchen2008@126.com）。
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收稿日期：2018-06-10
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