基于四氧化三钴-多壁碳纳米管纳米复合材料修饰阳极的苯酚/氧气燃料电池的构建  

Construction of Phenol/Oxygen Fuel Cell Based on Cobaltosic Oxide-Multi-Walled Carbon Nanotubes Nanocomposite-modified Electrode as Anode

作　　者：刘书绘 雷杰 吴媛 晋晓勇[1] 彭娟[1] 倪刚[1] LIU Shu-Hui;LEI Jie;WU Yuan;JIN Xiao-Yong;PENG Juan;NI Gang(State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering,School of Chemistry and Chemical Engineering,Ningxia University,Yinchuan 750021,China)

机构地区：[1]省部共建煤炭高效利用与绿色化工国家重点实验室宁夏大学化学化工学院

出　　处：《分析化学》2019年第8期1195-1204,共10页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金项目(Nos.21765016,21765017,21567021);宁夏化学工程与技术国内一流学科建设项目(No.NXYLXK2017A04);西部一流大学建设重大创新项目(No.ZKZD2017003)资助~~

摘　　要：采用溶剂热法合成了四氧化三钴(Co 3O 4)纳米粒子,将其与酸化处理后的多壁碳纳米管(MWCNTs)通过超声辅助法制备出Co 3O 4-MWCNTs纳米复合材料,然后将纳米复合物修饰在玻碳电极上,制备苯酚/O 2燃料电池的阳极(Co 3O 4-MWCNTs/GCE)。采用扫描电镜、透射电镜及X-射线粉末衍射等方法对所得材料的形貌进行了表征,研究了苯酚在不同电极(GCE、MWCNTs/GCE、Co 3O 4/GCE及Co 3O 4-MWCNTs/GCE)上的循环伏安响应特性,考察了Co 3O 4-MWCNTs修饰电极在不同扫速(20~120 mV/s)和不同浓度(60~300 mg/L)苯酚溶液中电化学响应信号的变化。电化学测试结果表明,与单一的Co 3O 4或者MWCNTs相比,Co 3O 4-MWCNTs纳米复合材料对苯酚电催化氧化性能更好。采用循环伏安法电沉积铂膜为阴极氧还原催化剂,循环沉积30圈后得到铂膜修饰的玻碳电极(Pt/GCE)。以Co 3O 4-MWCNTs/GCE为阳极,Pt/GCE为阴极,构建了苯酚/O 2燃料电池,当苯酚浓度为500 mg/L时,此燃料电池的开路电位(OCP)为0.44 V,在0.35 V下测得最大功率密度(P max)为0.27 mW/cm 2。Cobaltosic oxide(Co 3O 4)nanoparticles were synthesized by solvothermal method,which were applied to prepare Co 3O 4-MWCNTs nanocomposites multi-walled carbon nanotubes(MWCNTs)by ultrasonic assisted method.Then,glassy carbon electrode(GCE)was modified with the nanocomposites(Co 3O 4-MWCNTs/GCE)as anode for the preparation of phenol/O 2 fuel cell.The morphology of the prepared materials was characterized by scanning electron microscopy,transmission electron microscopy and X-ray powder diffraction.In addition,the cyclic voltammetric response characteristics of phenol on different electrodes(GCE,MWCNTs/GCE,Co 3O 4/GCE and Co 3O 4-MWCNTs/GCE)were investigated.The electrochemical response signals at different scan rates(20-120 mV/s)and different concentrations(60-300 mg/L)of phenol on Co 3O 4-MWCNTs modified electrodes were also investigated.The results of electrochemical test showed that Co 3O 4-MWCNTs nanocomposites had better electrocatalytic performance for the oxidization of phenol than that of simplex Co 3O 4 or MWCNTs.The platinum film was electrodeposited by cyclic voltammetry as a cathode oxygen reduction catalyst,and a platinum film-modified glassy carbon electrode(Pt/GCE)was obtained after 30 CV deposition cycles.A phenol/O 2 biofuel cell was thus constructed with Co 3O 4-MWCNTs/GCE as anode and Pt/GCE as cathode.The open circuit potential(OCP)of the fuel cell was 0.44 V and the maximal power density(Pmax)measured at 0.35 V was 0.27 mW/cm 2 when the phenol concentration was 500 mg/L,exhibiting good application potential.

关 键 词：四氧化三钴 多壁碳纳米管 纳米复合材料 苯酚 燃料电池 

分 类 号：TB3[一般工业技术—材料科学与工程]