CAJ | 학술논문

以氢氧化锂、磷酸二氢铵和醋酸锰为原料,以聚乙二醇PEG-400为表面活性剂,经低热反应合成前驱体NH_4MnPO_4,再经固相反应制各LiMnPO_4纳米晶体.对产物进行了表征,研究了活化温度对LiMnPO_4生成过程的影响,探讨其可控制分步合成过程.结果表明,晶体生长动力学指数n=1.1,晶粒生长激活能E=20.98 kJ/mol.在LiMnPO_4晶粒生长过程中可通过调节温度控制LiMnPO_4晶粒粒度.以LiMnPO_4为材料制作析氢电极,电极因材料粒度不同在水溶液中催化析氢的程度不同,随电极材料粒度增大,析氢电极反应平衡电势负移.
이경양화리、린산이경안화작산맹위원료,이취을이순PEG-400위표면활성제,경저열반응합성전구체NH_4MnPO_4,재경고상반응제각LiMnPO_4납미정체.대산물진행료표정,연구료활화온도대LiMnPO_4생성과정적영향,탐토기가공제분보합성과정.결과표명,정체생장동역학지수n=1.1,정립생장격활능E=20.98 kJ/mol.재LiMnPO_4정립생장과정중가통과조절온도공제LiMnPO_4정립립도.이LiMnPO_4위재료제작석경전겁,전겁인재료립도불동재수용액중최화석경적정도불동,수전겁재료립도증대,석경전겁반응평형전세부이.
The nano-erystallites of LiMnPO_4 powder were successfully prepared after calcining the precursor of NH_4MnPO_4 at high activation temperature. The precursor was prepared with lithium hydroxide, monoammonium phosphate and manganese acetate via solid state reaction at low temperature. The effect of activation temperature on the crystallization process of LiMnPO_4 was characterized by infrared spectroscopy, XRD, TG-DTA and SEM. The results showed that the synthesis of LiMnPO_4 was involved in variety of kinetic competition at high activation temperature, but the calcination process was the control step of synthesis, the kinetic index number of crystal growth 1.1, and the activation energy of nano-grain growth 20.95 kJ/mol. And the particle size of LiMnPO_4 was controlled in the synthesis process at different activation temperatures, and LiMnPO_4 was used as hydrogen precipitation electrode material, the electrode equilibrium potential was changed by LiMnPO_4 particle size.