水热法制备MoO3过程中pH对晶型结构和性能的影响  

Effect of pH on the crystal structure and properties during the synthesis of MoO_(3)by hydrothermal method

作　　者：朱鹏强 杨晓峰[1] 陈志萍[1] 王高[2] 赵艳茹 张玉莹 ZHU Peng-qiang;YANC Xiao-feng;CHEN Zhi-ping;WANG Gao;ZHAO Yan-ru;ZHANG Yu-ying(School of Chemistry and Chemical Engineering,North University of China,Taiyuan 030051,China;School of Information and Communication Engineering,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学化学与化工学院,山西太原030051 [2]中北大学信息与通信工程学院,山西太原030051

出　　处：《化学研究与应用》2025年第4期821-827,共7页Chemical Research and Application

基　　金：山西省自然科学基金项目(201901D111138)资助;山西省回国留学人员科研资助项目(HGKY2019069)资助。

摘　　要：三氧化钼(MoO_(3))具有多种物相和较高的电化学活性,在储能领域展现出巨大的应用潜力。本研究以四水合七钼酸铵[(NH_(4))_(6)Mo_(7)O_(24)·4H_(2)O]为钼源,应用水热法制备MoO_(3)。结果表明,当反应体系pH为1时,可制得亚稳态六方相三氧化钼(h-MoO_(3))。所制得的h-MoO_(3)具有良好的充放电循环稳定性,500次循环充放电后电容保持率仍在95%以上。当反应体系pH为0.1时,可制得正交相-三氧化钼(α-MoO_(3))。所制得的α-MoO_(3)表现出较大的比电容特性,当电流密度为0.5 A·g^(-1)时,比电容可达72.3 F·g^(-1)。pH通过影响钼酸根离子存在形式和氨的配位作用实现对MoO_(3)的晶型调控。本研究可为MoO_(3)的可控制备及性能调控提供理论指导。Molybdenum trioxide(MoO_(3))shows significant application potential in the field of energy storage due to its multiple phases and high electrochemical activity.MoO_(3)is prepared by hydrothermal method using ammonium heptamolybdate tetrahydrate((NH_(4))_(6)Mo_(7)O_(24)·4H_(2)O)as the molybdenum source.The results show that when the pH of the reaction system is 1,metastable hexagonal molybdenum trioxide(h-MoO_(3))can be synthesized.The h-MoO_(3)shows high charge-discharge cycle stability,maintains a capacitance retention rate of over 95%after 500 cycles of charge-discharge.When the pH of the reaction system is adjusted to 0.1,the orthorhombic phase of molybdenum trioxide(α-MoO_(3))can be successfully synthesized.Theα-MoO_(3)shows significant specific capacitance,has a specific capacitance of 72.3 F·g^(-1)at a current density of 0.5 A·g^(-1).The regulation of the crystal structure of MoO_(3)is facilitated by pH,which exerts control through modulating the concentration of molybdate ions and the coordination of ammonia.The influence rules of pH on the crystal structure and properties of MoO_(3)can provide theoretical guidance for the controllable preparation and performance regulation of MoO_(3).

关 键 词：h-MoO_(3) α-MoO_(3) 水热法 比电容 循环稳定性 

分 类 号：O614.6[理学—无机化学]