钴铝双金属氢氧化物的制备及电化学性能研究  

Preparation and electrochemical properties of cobalt-aluminum layered double hydroxides

作　　者：李静霄 叶发萍 解玉龙 赵素琴 LI Jing-xiao;YE Fa-ping;XIE Yu-long;ZHAO Su-qin(Qinghai Minzu University,College of Chemistry and Chemical Engineering,Key Laboratory of Resource Chemistry and Eco-environmental Protection in Tibetan Plateau of State Ethnic Affairs Commission,Qinghai Provincial Key Laboratory of Applied Physical Chemistry,Xining 810007,China)

机构地区：[1]青海民族大学化学化工学院,青藏高原资源化学与生态环境保护国家民委重点实验室,青海省应用物理化学重点实验室,青海西宁810007

出　　处：《化学研究与应用》2023年第3期662-668,共7页Chemical Research and Application

基　　金：青海省应用基础研究项目(2020ZJ705)资助。

摘　　要：选用三种不同的结构导向剂,以硝酸钴(Co(NO_(3))_(2)·6H_(2)O)为钴源、硝酸铝(Al(NO_(3))_(3)·9H_(2)O)为铝源,通过简单的水热法制备了钴铝双金属氢氧化物,并对制备的双金属氢氧化物的形貌结构及其电化学性能进行表征,以分析研究结构导向剂种类对所得材料形貌结构及其电化学性能的影响。结果表明:不同的结构导向剂不仅影响着双金属氢氧化物的形貌结构,而且对其电化学性能也有一定的影响,其中以氟化铵(NH4F)为结构导向剂时合成的钴铝双金属氢氧化物具有三维花朵状结构和优异的电化学性能,在电流密度为0.5 A·g^(-1)下,其比电容为572.2 F·g^(-1),在4.0 A·g^(-1)电流密度下,进行500次充放电循环后电容保持率达84.9%,说明其具有良好的循环稳定性。Using three different structure-directing agents,cobalt nitrate(Co(NO_(3))_(2)·6H_(2)O)as the cobalt source and aluminum nitrate(Al(NO_(3))_(3)·9H_(2)O)as the aluminum source,cobalt-aluminum bimetallic hydroxide was synthesized by simple hydrothermal method.The morphology,structure and electrochemical properties of the prepared bimetallic hydroxide were characterized.The effects of the types of structure-directing agents on the morphology and electrochemical properties of the obtained materials were studied and analyzed.The results show that different structure-directing agents not only affects the morphology and structure of bimetallic hydroxide,but also has a certain influence on its electrochemical performance.Among them,the cobalt-aluminum bimetallic hydroxide synthesized with ammonium fluoride((NH_(4)F)as the structure-directing agent has three-dimensional flower-like structure and excellent electrochemical performance.At the current density of 0.5 A·g^(-1),its specific capacitance is 572.2 F·g^(-1),and at the current density of 4.0 A·g^(-1),the capacitance retention rate reaches 84.9%after 500 charge-discharge cycles,indicating that it has good cycle stability.

关 键 词：结构导向剂 钴铝双金属氢氧化物 水热法 电化学性能 

分 类 号：O614.3[理学—无机化学]