Deposition of Nickel Hydroxide Nanoparticles Derivatized from Nickel Chitosan Complex on Glassy Carbon Electrode for Oxidative Electrocatalysis

作者：Ciszewski Aleksander^*; Stepniak Izabela

来源：International Journal of Electrochemical Science, 2013, 8(5): 6377-6392.

• Electrocatalysis
• Modified electrodes
• Chitosan
• Ni(OH)(2)-nanoparticles
• Methanol

We demonstrate, for the first time, the chemical/electrochemical synthesis of uniformly dispersed nickel hydroxide nanoparticles (NPs) embedded in a chitosan (CH) membrane deposited on a glassy carbon (GC) electrode. The morphology of this composite was investigated by scanning electron microscopy (SEM). The SEM results show that NPs have a nano-globular structure in the range 10 (sic) 100 nm. This composite displays electrocatalytic activity toward oxidation of methanol in alkaline solution. The electrochemical properties of the resulting material deposited as a redox film have been investigated by cyclic voltammetry and chronoamperometric techniques. Using Lavirin's theory the electron-transfer rate constant and the transfer coefficient were determined to be k(s) = 4.1 s(-1) and alpha = .42, respectively, for a modifier film (GNi = 7.1 x 10-10 mol cm(-2)) on a GC electrode in 0.1 M sodium hydroxide solution. Chronoamperometric studies were also used to determine the catalytic rate constant for the catalytic reaction of the tested modifier with methanol (k(ch) = 1.7 x 104 cm(3) mol(-1) s(-1)). The dependence of the methanol oxidation current on alcohol concentration is discussed. The modified electrode for methanol oxidation is characterized by simple preparation, good stability and good reproducibility.

• 出版日期2013-5