碳纳米管表面Pd纳米颗粒对甲醇的电催化氧化研究

采用电化学循环伏安法分别在碳纳米管(CNT)和玻碳(GC)电极表面沉积Pd纳米颗粒。扫描电镜(SEM)和XRD分析显示了Pd纳米颗粒均匀分散于碳纳米管表面,而在GC表面则趋向于堆积形成Pd金属薄膜。比较研究了Pd/CNT和Pd/GC电极在碱液中对甲醇的电催化氧化性能,循环伏安结果发现,Pd/CNT对甲醇的催化活性要高于Pd/GC电极;而交流阻抗谱研究发现,Pd/CNT电极对甲醇具有更快的催化氧化速率。另外,不同Pd载量,不同环境温度以及不同甲醇浓度的研究表明,相对于Pd/GC电极,Pd/CNT电极对甲醇的催化氧化具有更高的灵敏度和电化学稳定性。

Electrocatalytic oxidation of methanol on palladium nanoparticles deposited carbon nanotube electrodes

Palladium nanoparticles were electrochemically deposited onto both carbon nanotubes (CNT) and glassy carbon (GC) electrodes through cyclic voltammetry (CV) method.SEM and XRD analysis showed that Pd nanoparticles were well dispersed on CNT electrodes,but Pd nanoparticles tended to form Pd thin film on GC electrodes.Electrocatalytic activities of both electrodes to the oxidation of methanol,including the catalytic velocity and efficiency as well as electrodes stability,had been investigated and compared in alkali liquor.Higher electrocatalytic activity has been achieved on Pd/CNT electrodes.The systematic study of affecting factors such as Pd nanoparticles loading,reaction temperature,and reactant concentration further suggested that Pt/CNT possessed higher electrocatalytic activity and higher efficiency toward the electrooxidation of methanol.