硼掺杂金刚石薄膜电极上水杨酸的电化学行为  

Electrochemical behavior of salicylic acid at boron-doped diamond electrode

作　　者：吕江维[1] 曲有鹏[2] 田家宇[3] 高珊珊[3] 刘峻峰[3] 

机构地区：[1]哈尔滨商业大学药学院,黑龙江哈尔滨150076 [2]哈尔滨工业大学生命科学与技术学院,黑龙江哈尔滨150080 [3]哈尔滨工业大学城市水资源与水环境国家重点实验室,黑龙江哈尔滨150090

出　　处：《应用化工》2016年第11期2034-2038,共5页Applied Chemical Industry

基　　金：国家自然科学基金资助项目(51308171);黑龙江省教育厅科学技术研究项目资助(12541185)

摘　　要：硼掺杂金刚石(BDD)薄膜电极是用于电化学分析中的理想电极材料。以水杨酸(SA)为目标物,利用循环伏安法(CV)和电化学阻抗谱(EIS)对BDD电极上SA的电化学行为进行了研究。结果发现,SA的电化学过程有两个氧化峰,没有还原峰,氧化还原反应为不可逆反应。在低电势下出现的氧化峰电流正比于扫描速率的平方根,具有良好的线性关系,表明不可逆的氧化反应过程中扩散步骤为反应的控制步骤。电极/溶液界面的结构可以用R(QR)的等效电路拟合,当电极电位从开路电位(OCP)提高到2.5 V时,电荷转移电阻Rct从5.137×105Ω·cm2降低到4.171×102Ω·cm2,说明电极电位的增加能够加快氧化反应的进行,可以提高电催化反应速率大小。Boron-doped diamond （ BDD） electrode is an ideal electrode material used in electrochemical analysis.The electrochemical behavior of salicylic acid （SA） at BDD electrode was investigated by cyclic voltammetry （CV） and electrochemical impedance spectroscopy （EIS）.The oxidation-reduction reaction of SA was irreversible since two oxidation peaks without reduction peak were found at BDD electrode in the electrochemical process .The oxidation peak current at low potential was in proportion to square root of the scan rate with a good linear relationship ,indicating that the diffusion step was the control step of the irreversible oxidation reaction .The structure of electrode/solution interface was simulated by R （ QR ） equivalent circuit .When the polarization potential was increased from open circuit potential （ OCP ） to 2.5 V,the charge transfer resistance R ct was decreased from 5.137 x105 Ω·cm2 to 4.171 x 102 Ω·cm2 ,indicating that increasing the electrode potential could decrease the resistance of electrocata -lytic reaction that accelerated the oxidation reaction and its rate .

关 键 词：硼掺杂金刚石 循环伏安 电化学阻抗谱 水杨酸 电化学行为 

分 类 号：TQ150.1[化学工程—电化学工业]