第 48 卷第 3 期 Vol. 48 No. 3 2018 年 6 月 Jun 2018

所属栏目：功能材料 水热法制备α-MoO3煅烧对其结构、电容性能影响研究

牛 彦，陈志萍*，杨晓峰，孔德兵，毛贝贝，张越鹏 （中北大学 理学院 化学学科部，山西 太原 030051）

摘　要：以钼酸铵和浓硝酸为原料，采用一步水热法成功制备了α-MoO3。通过Raman、FT-IR、XRD、FESEM探究了600℃煅烧对α-MoO3结构、形貌的影响。用循环伏安法（CV）、恒流充放电（GCD）和电化学阻抗谱（EIS）对煅烧前后α-MoO3的电容特性进行研究。结果表明：煅烧后α-MoO3的粒径和晶面间距变大，Mo-O键的极化率和粒子的结晶度提高。煅烧后α-MoO3的电荷转移电阻较煅烧前明显减小（Rct=1.6 Ω），且表现出更加明显的赝电容特性。以0.5 mol·L-1 Li2SO4为电解液，在0.5 A·g-1的电流密度下，煅烧后α-MoO3的比电容较煅烧前提高了100.5%，达到163.56 F·g-1。由煅烧后α-MoO3制备的电极经1 000次循环，电容保持率为87.5 %，表现出好的循环稳定性。

关键词：电容性能；α-MoO3；煅烧；比电容

中图分类号：O646.54；TM912.9　　文献标识码：A　　文章编号：1009-9212（2018）03-0049-06

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

基金项目：山西省留学人员科技活动择优资助项目（2016），山西省131领军人才项目（2016），山西省自然科学基金项目（2015011025）。

作者简介：牛 彦（1993-），女，山西定襄人，硕士研究生，研究方向：电极材料的制备（E-mail：996920382@qq.com）。

联 系 人：陈志萍，副教授，研究方向：功能材料制备及性能（E-mail：Zhipingchen2008@126.com）。

收稿日期：2018-06-10