非化学计量的混合价态氧化钼(VI,V)修饰微电极的电化学制备

在新鲜配制的Na2MoO4的弱酸性水溶液中, 通过循环电位扫描在碳纤维微电极表面可沉积一层均匀的蓝色氧化钼(VI, V)薄膜, 膜的厚度通过电量进行控制。在电沉积之前, 电极的阳极化处理不仅可以加快氧化钼的电沉积, 而且可以改善膜的伏安行为。溶液的pH值对膜的电沉积和伏安行为有极大的影响。膜的阴极过程被认为是产生青钼铜: HxMoO3 (0

Electrochemical preparation of microelectrodes modified with non- stoichiometric mixed-valent molybdenum oxides

A compact non-stoichiometric molybdenum (VI, V) oxide of blue film was grown on carbon fiber (CF) microelectrode surface by cycling the potential between +0.2V and -0.70V in a freshly prepared Na2MoO4 solution containing 5×10^-^3mol/L H2SO4. The quantity of the oxide is controlled by the charge passing the electrode. The electrochemical pretreatment of CF microelectrode not only raises the deposition velocity of molybdenum oxide on CF surface, but also improves greatly the cyclic voltammetric behavior of the molybdenum oxide film prior to the electrodeposition. The cathodic processes are believed to yield the hydrogen molybdenum oxide bronzes, HxMoO3 (0