碱性溶液中离子注入钯的玻璃碳电极上硝基苯的电化学还原

Electroreduction of nitrobenzene on palladium-implanted glass carbon electrode in basic solution

用循环伏安法在离子注入钯的玻璃碳电极上 ,研究了硝基苯在 0 .1 mol/L Na OH溶液中的电还原过程 ,通过 AES测量了离子注入电极的表面组成和各元素的浓度 -深度分布 .在 40 ke V下 ,将注入剂量为 1× 1 0 1 7离子 /cm2 的钯注入到玻璃碳 (GC)中可产生钯原子最大百分含量为2 0 %的近表面区 ,原基体注入钯后比未注入的 GC对硝基苯 (NB)的电还原有更高的活性 .用现场ESR与电化学方法联用检测到硝基苯的单电子还原产物硝基苯阴离子自由基 ,用现场 UV光谱法也检测到硝基苯的电还原产物苯胺 。

The electroreduction processes of nitrobenzene (NB) in 0.1 mol/L NaOH solution at the palladium implanted glass carbon (GC) electrodes by cyclic voltammetry.The surface composition of implanted electrode and concentration depth profiles of various elements are measured by AES. Implantation of palladium into GC at 40 keV to a fluence of 1×10 17 ions · cm -2 produced a surface near region with a maximum atomic concentration of 20% palladium. The implanted substrates are much more active than the untreated one in the electroreduction of NB. The NB radical anion,which is the product of one electron electroreduction of NB, is detected by ESR in situ in conjuction with electrochemical methods. Aniline is also detected as a product of electroreduction of NB by using UV spectra in situ. According to the experimental results,the electroreduction mechanism of NB is discussed.