Zhang Jun, Ma Xuwen, Li Zhongping, Dong Chuan
J Nanosci Nanotechnol. 2014 Sep;14(9):7242-9. doi: 10.1166/jnn.2014.8928.
A Pd nanoparticle modified indium tin oxide (Pd NPs/ITO) electrode was prepared by cyclic voltammetry (CV) methods. The surface morphology of the modified electrode was characterized by scanning electron microscopy (SEM). The Pd NPs/ITO electrode exhibits excellent electrocatalytic activity towards the oxidation of four low-carbon alcohols including methanol, ethanol, propanol and isopropanol in alkaline electrolyte at room temperature. The effects of reactant concentration and scan rate on the alcohols electrocatalytic oxidation at the Pd NPs/ITO electrode were discussed in detail and the electrocatalytic oxidations of four alcohols are confirmed as diffusion-controlled process from their similar CV characteristic. These low-carbon alcohols or their dissociation products are adsorbed on the surface of Pd NPs/ITO electrode, and simultaneously inhibit the adsorption and desorption of hydrogen, leading to the dominant of alcohol oxidation. The oxidation processes of four low-carbon alcohols are irreversible on Pd NPs/ITO electrode. The activity order of alcohol oxidation on Pd NPs/ITO electrode is identified as ethanol > propanol > methanol > isopropanol. The four alcohols can be easily identified from their positions of oxidation peak.
采用循环伏安法（CV）制备了钯纳米粒子修饰的氧化铟锡（Pd NPs/ITO）电极。通过扫描电子显微镜（SEM）对修饰电极的表面形貌进行了表征。Pd NPs/ITO电极在室温下的碱性电解质中对甲醇、乙醇、丙醇和异丙醇这四种低碳醇的氧化表现出优异的电催化活性。详细讨论了反应物浓度和扫描速率对Pd NPs/ITO电极上醇类电催化氧化的影响，并且从它们相似的循环伏安特性证实了四种醇的电催化氧化为扩散控制过程。这些低碳醇或其解离产物吸附在Pd NPs/ITO电极表面，同时抑制了氢的吸附和解吸，导致醇氧化占主导地位。四种低碳醇在Pd NPs/ITO电极上的氧化过程是不可逆的。确定了Pd NPs/ITO电极上醇氧化的活性顺序为乙醇>丙醇>甲醇>异丙醇。可以从它们的氧化峰位置轻松识别这四种醇。
