金电极面积两种计算方法的比较研究  

Comparative Study on Two Calculation Methods of Gold Electrode Area

作　　者：张玲玲 骆恩淇 刘玉革 贾永梅 李靓 姚佳琳 李志果 ZHANG Lingling;LUO Enqi;LIU Yuge;JIA Yongmei;LI Liang;YAO Jialin;LI Zhiguo(School of Chemistry and Chemical Engineering,Key Laboratory of Clean Energy Materials Chemistry of Guangdong Higher Education Institutes,Lingnan Normal University,Zhanjiang 524048)

机构地区：[1]岭南师范学院化学化工学院,清洁能源材料化学广东普通高校重点实验室,广东湛江524048

出　　处：《分析科学学报》2024年第6期613-619,共7页Journal of Analytical Science

基　　金：广东省自然科学基金(2023A1515011176,2022A1515011908);湛江市科技发展专项基金(2020A01041);广东省教育厅科研项目基金(2023ZDZX2037,2022KTSCX072);岭南师范学院科研项目基金(YL20200207)。

摘　　要：基于电沉积方法,通过改变沉积时间(t)在金电极表面沉积纳米金,得到纳米金修饰电极。运用Randles-Sevcik法和氧还原法分别求算电极面积(A_(D)和A_(O))和粗糙因子(R_(f(D))和R_(f(O))),探讨两种方法求算结果的相关性。研究表明,电极面积随t的增长而线性增大。和Randles-Sevcik法相比,氧还原法得到的电极面积和粗糙因子较大,A_(O)和R_(f(O))~t的线性斜率是A_(D)和R_(f(D))~t的7倍。因此,氧还原法求算的面积更能反映电极的微观粗糙度。当R_(f(O))较小时,R_(f(D))/R_(f(O))接近1,两种方法求得的粗糙因子接近;随着R_(f(O))的增大,R_(f(D))/R_(f(O))逐渐降低;当R_(f(O))大于5时,R_(f(D))/R_(f(O))在0.25附近,基本不变。这些结论对于金电极面积的计算及应用具有一定的指导意义。In this article we electrodeposited nanogold on a bare gold surface to obtain a series of nanogold modified electrodes by changing the electrodeposition time(t).The electrode area(A_(D) and A_(O))and roughness factor(R_(f(D))and R_(f(O)))were calculated based on the Randles-Sevcik method and oxygen reduction method respectively,and the relationship between the two methods was explored.Results indicated that the electrode area increased linearly with the increase of t.Compared with the Randles-Sevcik method,the electrode area and roughness factor obtained by the oxygen reduction method increased more rapidly with t.The linear slope of A_(O) and R_(f(O))-t was seven times that of A_(D) and R_(f(D))-t.Therefore,the area calculated by the oxygen reduction method could better reflect the real electrode roughness.When R_(f(O))was smaller,R_(f(D))/R_(f(O))approached 1,and the roughness factors obtained by the two methods were close;As R_(f(O))increased,R_(f(D))/R_(f(O))gradually decreased;When R_(f(O))was bigger than 5,R_(f(D))/R_(f(O))remained basically unchanged around 0.25.These conclusions provided guidance for the calculation and application of gold electrode area.

关 键 词：金电极 电沉积 电极面积计算 粗糙因子 

分 类 号：O657.1[理学—分析化学]