Mo掺杂对Pt/C催化剂乙醇氧化催化性能的影响

直接乙醇燃料电池(DEFC)由于其高能量密度、绿色无污染等优势受到广泛关注, 寻找和开发具有高乙醇氧化催化活性和抗CO中毒能力的阳极催化剂对DEFC的未来发展和商业应用具有重要意义。本研究采用微波法合成了一系列Mo掺杂的Pt/C催化剂, 并通过循环伏安法、交流阻抗法、计时电流法等电化学技术考察了Mo的掺杂量对Pt/C催化剂乙醇氧化催化活性和稳定性的影响。结果表明: Pt₂Mo/C催化剂在乙醇氧化催化过程中表现出与Pt/C相当的起始电位、最大的峰电流密度和最慢的衰减速度, 说明该催化剂具有最高的乙醇氧化催化活性和最稳定的工作性能。

Effects of Mo Doping on Properties of Pt/C as Catalyst towards Electro-oxidation of Ethanol

Direct Ethanol Fuel Cells (DEFCs) have attracted lots of interest with the merits of high energy density and environmental benignity. Thus, development of novel efficient catalyst with high activity and excellent durability is of great importance for the future large-scale application of DEFCs. A series of Mo-doped Pt/C catalysts were synthesized with microwave assisted technology, and the effects of Mo content on the activity as well as durability of the resulted catalyst towards ethanol oxidation were comparatively investigated by using cyclic voltammetry, electrochemical impedance spectroscopy and chronoamperometry. The result shows that the Pt₂Mo/C catalyst demonstrates a comparable onset potential to Pt/C, the highest current density and the slowest deterioration towards ethanol oxidation, implying that the Pt₂Mo/C catalyst is best one to achieve highest activity and best durability.