Pd-Ru/C催化剂的制备及其甲酸氧化活性研究

利用微波辅助有机溶胶法成功制备了Pd3Ru/C纳米电催化剂。相比传统的高压有机溶胶法,该法大大降低了有机溶剂的使用量并缩减了反应时间,是一种环境友好和资源节约的新型方法。采用XRD,TEM,XPS和电化学测试等手段对其结构和电化学性能进行了表征和评价。XRD和TEM结果表明微波辅助制备的Pd3Ru/C催化剂其粒径只有约3.0 nm,分散性也较Pd/C得到显著改善;XPS谱图证实催化剂活性组分Pd和Ru的原子比约为3.13∶1,Pd和Ru两种元素间发生了相互作用。与同条件制备的Pd/C催化剂相比,Pd3Ru/C催化剂在电极上发生甲酸氧化反应的主要峰电位负移了约100 mV,峰电流密度增大了2/3左右,其甲酸电氧化活性得到明显提高。

Research on the Preparation and Oxidation Activity of the Formic Acid of Pd-Ru/C Catalysts

The Pd3Ru/C nano-electro-catalyst was successfully prepared with the microwave-assisted organic sol-gel method.Compared with the traditional organic sol-gel method,the method greatly reduces the usage amount of organic solvent and reaction time and is a novel environment-friendly and resource-saving one.The structure and electrochemical performance were characterized and evaluated by XRD,TEM,XPS and electrochemical measurement.The XRD and TEM results show that the Pd3Ru/C catalyst has the particle size of about 3.0 nm and better dispersion than that of the Pd/C catalyst.The XPS confirms the atom ratio of Pd and Ru is about 3.13∶1,and some interactions exist between them.Compared with the Pd/C catalyst prepared with the same condition,the main peak potential of the Pd3Ru/C catalyst shifts negatively about 100 mV,and the peak current density increases about 2/3 for the oxidation of formic acid on the electrode.The activity of the Pd3Ru/C catalyst for the formic acid electro-oxidation is improved obviously.