摘要
以水合氯化钴为原料,氢氧化钠和水合肼为碱性沉淀剂,在不添加任何分散剂的情况下采用化学沉淀法制备出呈六边形的片状β-Co(OH)_2。采用X射线衍射和透射电子显微镜表征所制样品的结构和形貌,采用循环伏安和恒电流充放电等测试方法对其电化学性能进行初步研究。结果表明,六边形片状β-Co(OH)_2边长为100~200nm,厚度为几十纳米,且随氯化钴溶液浓度的降低,单晶片的厚度逐渐减小。其表现出一定的电化学性能,电流密度为1A/g时,比电容可达到83.3F/g,且性能稳定。
A highly efficient,mild（also dispersant-free）method has been developed in this work for synthesizingβ-Co（OH）_2 nanoplatelets,by using hydrated cobalt chloride as raw material,sodium hydroxide and hydrazine hydrate as alkaline precipitating agents.The morphology and microstructure of the product were characterized by X-ray diffraction（XRD）and transmission electron microscopy（TEM）,respectively.The edge length of hexagonalβ-Co（OH）_2 nanoplatelets is about 100—200 nm and the thickness is about tens of nanometers.As the concentration of cobalt chloride solution decreasing,the thickness of the single-chip ofβ-Co（OH）_2 gets attenuated.The electrochemical performances of the as-synthesized samples were investigated by cyclic voltammetry and constant-current charge/discharge test.The thinner cobalt hydroxide will lead to higher specific capacitance ofβ-Co（OH）_2,and it can reach 83.3 F/g at the current density of 1 A/g along with a high stability.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2017年第22期15-20,25,共7页
Materials Reports
基金
科技部院所基金(2013EG115003)
关键词
β-Co(OH)2
沉淀
纳米片
电化学性能
高效制备
温和制备
超级电容器
比电容
β-Co（OH ） 2,precipitation ’ nanoplatelet ’ electrochemical performance , highly efficient synthesis ’ mild synthesis ’supercapacitor,specific capacitance
作者简介
张鸿宇：女,1991年生,硕士研究生,研究方向为燃料电池E-mail：bjxzhy@163.com
曾蓉：通讯作者,女,1970年生,博士,高级工程师,硕士研究生导师,研究方向为电化学E-mail：zr_zengrong@163.com
