四氧化三钴的制备及在过氧化氢电化学传感器中的应用

Preparation of Co_(3)O_(4) and Its Application in Electrochemical Detection of H_(2)O_(2)

以六水氯化钴、聚乙烯亚胺和辛胺为主要原料,通过水热法得到片状氢氧化钴(Co(OH)_(2))前驱体,并进一步煅烧得到片状Co_(3)O_(4)电催化活性材料。采用滴涂法制备Co_(3)O_(4)/GCE修饰电极,通过循环伏安法和计时安培法对过氧化氢(H_(2)O_(2))进行电化学检测分析,研究煅烧温度对所得到的Co_(3)O_(4)形貌以及H_(2)O_(2)检测性能的影响。结果表明:经200℃煅烧得到的Co_(3)O_(4)晶体为稳定的六方形片状结构,修饰电极200-Co_(3)O_(4)/GCE对H_(2)O_(2)检测表现出最高的响应电流值,该电极电流响应值与H_(2)O_(2)浓度在0.01~0.20 mmol/L范围内具有良好线性关系,检测限为6.53μmol/L(S/N=3),灵敏度为875.66μA/(mmol·L^(-1)·cm^(2));同时修饰电极Co_(3)O_(4)/GCE在对H_(2)O_(2)检测中表现出较好抗干扰能力。

Herein,the cobalt hydroxide is firstly prepared by hydrothermal method using cobalt chloride(CoCl_(2)·6H_(2)O),polyethyleneimine(BPEI),and octylamine.Then,the Co_(3)O_(4) is prepared by thermal decomposition of cobalt hydroxide.The Co_(3)O_(4)/glass carbon electrode(Co_(3)O_(4)/GCE)is fabricated by dropping Co_(3)O_(4) suspension on surface of GCE and is applied to detect the hydrogen peroxide(H_(2)O_(2))through the cyclic voltammetry and timing ampere response.The effects of calcination temperature on shape of Co_(3)O_(4) and performance of Co_(3)O_(4)/GCE to detect H_(2)O_(2) are systematically studied.The results demonstrate that the Co_(3)O_(4) prepared at annealing temperature of 200℃presents a hexagonal nanoplates shape and the 200-Co_(3)O_(4)/GCE shows the highest response current value to H_(2)O_(2).The current response of the 200-Co_(3)O_(4)/GCE has a good linear relationship with the concentration of H_(2)O_(2) in the range of 0.01~0.20 mmol/L,the detection limit is 6.53μmol/L(S/N=3),and the sensitivity is 875.66μA/(mmol·L^(-1)·cm^(2)).In addition,200-Co_(3)O_(4)/GCE also shows a good anti-interference ability for H_(2)O_(2) detection.