摘要
用循环伏安法和恒电位法研究了硼掺杂多晶金刚石薄膜电极(DFE)的若干电化学特性.电极面积4×4mm^2.在0.1mol/L KCI,NaNO_3,NaOH和KH_2PO_4+Na_2HPO_4(pH=6.86)电解质溶液中电势窗口均为-500^+800mV,而在0.lmol/L HCI和H_2SO_4溶液中电势窗口为-200^+1100mV.K_3Fe(CN)_6的氧化峰电位为+500mV,与Pt电极测量相同;校正曲线线性范围为25~400μmol/L;灵敏度为0.63μA/mm^2·mmol/L,高于铂薄膜电极的0.18μA/mm^2·mmol/L;响应时间为4s,相对标准偏差为2.3%(n=10).响应电流与扫描速率平方根成正比.连续使用二个月未发现其电化学性质有明显变化.
The electrochemical characteristic of boron-doped polycrystalline diamond thin film electrodes with 4 mm×4 mm in size was studied using cyclic voltammetry and potentio-static method. The potential windows all are - 500- + 800 mV in the electrolyte solution of 0. 1 mol/L KC1, NaNO3, NaOH and KH2PO4+Na2HPO4(pH = 6. 86), but -200- + 1100 mV in 0.1 mol/L H2SO4 and HC1. The oxide peak potential of K[Fe(CN)6] is +500 mV, and similar to that of Pt electrode. The response current is proportional to the square root of scan rate. The linear range of calculation curve, response time and relative standard deviation are 25-400 μmol/L, 3 s and 2. 3% (n=10), respectively. The sensitivity is 0. 63 μA/ (mmol/L) · (mm2) and higher than 0. 18 μA/(mmol/L) · (mm2) of planar Pt thin film electrode with 4 mm × 4 mm in size under the same experimental condition. It is observed that the electrochemical characteristics of the electrode do not change during two months of the operating period.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1995年第7期824-827,共4页
Chinese Journal of Analytical Chemistry
基金
国家自然科学基金资助项目(NO.29445008)
关键词
电化学特性
循环伏安法
DFE
金刚石薄膜电极
Diamond thin film, electrochemical characteristic, cyclic voltammetry, potassium ferricyanide
