壳聚糖修饰PdCe催化剂的甲醇电氧化性能

The Methanol Electrooxidation Performance of Chitosan Modified PdCe Catalyst

鉴于直接甲醇燃料电池(DMFC)商业化发展中存在的制约因素,包括阳极催化剂活性低及甲醇向阴极渗透等问题,本文采用壳聚糖修饰载体和过渡金属Ce掺杂等手段对DMFC的Pd基阳极催化剂进行改性,以微波辅助乙二醇还原法制备PdCe/(CNT-CS)阳极催化剂,并研究其甲醇电氧化性能。结果表明,PdCe/(CNT-CS)催化剂具有较高的甲醇电催化氧化活性和良好的电化学稳定性。其甲醇氧化峰电流密度约为Pd/CNT峰电流密度的1.4倍;单电势阶跃计时电流试验结果显示,经过1200s试验后,其电流衰减幅度为78.6%,远低于Pd/CNT催化剂。

In view of the constraints of the commercial development of direct methanol fuel cells(DMFC),including the low activity of the anode catalyst and the penetration of methanol into the cathode,etc,a chitosan modified PdCe anode catalyst i.e.PdCe/(CNT-CS)is prepared using a microwave assisted ethylene glycol reduction method,and its electrocatalytic performance for methanol oxidation is measured.The result shows that PdCe/(CNT-CS)has a high catalytic activity for methanol electrooxidation and a good electrochemical stability.The peak current density of methanol oxidation is 1.4 times higher than that of Pd/CNT,and the current decay amplitude is 78.6% after a chronoamperometry test for 1200 s.