摘要
锰(Mn)基钙钛矿氢氧化物(MnSn(OH)_(6))具有立方钙钛矿结构,在锂电池以及电解制氢等领域具有良好的应用潜力.为避免传统Mn基钙钛矿材料因高温成相造成纳米结构及表面活性的破坏,采用简易的湿化学方法,制备晶相纯净、形貌可控的MnSn(OH)_(6)纳米材料.通过X射线衍射、扫描电子显微镜和透射电子显微镜等表征手段,系统研究合成工艺参数对样品晶体结构、微观形貌及组成分布的作用关系,并对制备出的MnSn(OH)_(6)纳米材料的电化学性能进行探索.研究结果表明,合成温度对MnSn(OH)_(6)双钙钛矿晶体结构的形成有直接影响,通过调控合成温度可去除生成的SnO2杂质;前驱体的用量决定MnSn(OH)_(6)的结晶核数目,通过调控前驱物用量可调控MnSn(OH)_(6)产物粒径与形貌;分散方式对产物的晶体结构发展及形貌调控均具有重要作用;产物的电化学性能需进一步探索与优化.研究成果可为Mn基钙钛矿纳米材料的制备和调控提供一种简单有效的途径.
Mn-based perovskite hydroxide(MnSn(OH)_(6))has a cubic perovskite structure and shows promising application potential in lithium batteries,electrolytic hydrogen production and other fields.In order to avoid the destruction of the surface-activity and the nanostructure of typical Mn-based perovskite materials due to hightemperature treatment,a simple wet chemical method was used to obtain MnSn(OH)_(6) nanomaterials with pure crystalline phase and tunable morphology.The effects of the synthesis process parameters on the crystal structure,microscopic morphology and composition distribution of materials were systematically studied by means of X-ray diffraction,scanning electron microscopy,transmission electron microscopy and other characterization methods,and the electrochemical properties of the prepared MnSn(OH)_(6) nanomaterials were preliminarily explored.The results show that the synthesis temperature has a direct influence on the formation of MnSn(OH)_(6) perovskite crystal structure.By adjusting the synthesis temperature,the generation of SnO2 impurities can be eliminated.The amount of precursors determines the number of crystalline nuclei of MnSn(OH)_(6),and the particle size and morphology of the MnSn(OH)_(6) product can be regulated by regulating the amount of precursors.The dispersion method plays an important role in both the crystal structure development and morphology regulation of the product.The electrochemical properties of the product need further exploration and optimization.The results of the study may provide a simple and effective approach for the preparation and regulation of Mn-based perovskite nanomaterials.
作者
邵静
龙心怡
方雨笙
余宙阳
SHAO Jing;LONG Xinyi;FANG Yusheng;YU Zhouyang(College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen 518071,Guangdong Province,P.R.China)
出处
《深圳大学学报（理工版）》
CAS
CSCD
北大核心
2023年第4期379-385,共7页
Journal of Shenzhen University(Science and Engineering)
基金
国家自然科学基金资助项目(52072247)
广东省基础与应用基础研究基金资助项目(2021A1515010735)。
关键词
纳米材料
钙钛矿氢氧化物
合成工艺
共沉淀法
微观形貌
电化学性能
nanomaterials
perovskite hydroxides
synthesis parameters
co-precipitation method
micro-morphology
electrochemical performance
