The pH-dependence of oxygen reduction on multi-walled carbon nanotube modified glassy carbon electrodes
The pH-dependence of oxygen reduction on multi-walled carbon nanotube modified glassy carbon electrodes
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DOI：
10.1016/j.carbon.2008.10.032
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发表时间：
2009-03-01
期刊：
影响因子：
10.9
通讯作者：
Tammeveski, Kaido
中科院分区：
文献类型：
--
作者：
Kruusenberg, Ivar;Alexeyeva, Nadezda;Tammeveski, Kaido
研究了多壁碳纳米管（MWCNT）修饰玻碳（GC）电极上氧电还原的pH依赖性。在电极修饰中使用了多种表面活性剂：双十六烷基磷酸氢盐、十六烷基三甲基溴化铵、十二烷基硫酸钠和Triton X-100。采用旋转圆盘电极（RDE）法在0.5M H2SO 4溶液、乙酸盐缓冲液（pH 5）、磷酸盐缓冲液（pH 6、7和8）、硼酸盐缓冲液（pH 10）、0.01M KOH、0.1M KOH和1 M KOH溶液中进行电化学实验。比较了不同pH值下碳纳米管修饰电极的氧还原行为。RDE结果表明，高pH溶液中氧还原的半波电位（E-1/2）较高。在较低pH（pH < 10）下，E-1/2的值基本上不依赖于溶液pH。与之前的裸GC研究相比，MWCNT上氧还原的半波电位的pH依赖性。改性的GC电极遵循与裸GC所观察到的趋势类似的趋势。(C)2008爱思唯尔有限公司保留所有权利。
The pH-dependence of oxygen electroreduction has been investigated on multi-walled carbon nanotube (MWCNT) modified glassy carbon (GC) electrodes. Various surfactants were used in the electrode modification: dihexadecyl hydrogen phosphate, cetyltrimethylammonium bromide, sodium dodecyl sulfate and Triton X-100. Electrochemical experiments were carried out in 0.5 M H2SO4 solution, acetate buffer (pH 5), phosphate buffers (pH 6, 7 and 8), borate buffer (pH 10), 0.01 M KOH, 0.1 M KOH and in 1M KOH solution, using the rotating disk electrode (RDE) method. The oxygen reduction behaviour of MWCNT-modified GC electrodes at different pHs was compared. The RDE results revealed that the half-wave potential (E-1/2) of oxygen reduction was higher in solutions of high pH. At lower pHs (pH < 10) the value of E-1/2 did not essentially depend on the solution pH. A comparison with previous studies on bare GC showed that the pH-dependence of the half-wave potential of oxygen reduction on MWCNT-modified GC electrodes follows a similar trend to that observed for bare GC. (C) 2008 Elsevier Ltd. All rights reserved.