聚吡咯改性炭载Pd催化剂促进甲酸电氧化

直接甲酸燃料电池(DFAFC)阳极活性炭载Pd催化剂活性组分易聚集,分散差且存在炭载体的电腐蚀作用,造成催化活性低稳定性差。 为解决上述问题,本文通过调控炭载Pd催化剂的载体改善催化活性和稳定性。 采用低温化学氧化法制备了聚吡咯(PPy)与活性炭复合材料,在聚合过程中加入活性炭,经过高温热解聚吡咯形成复合碳载体负载Pd催化剂,并表征了热解聚吡咯碳修饰催化剂表面形貌,发现聚吡咯修饰后的催化剂载体表面氮元素以吡咯氮的形式存在,催化剂活性组分Pd纳米粒子可稳定在2.25 nm。 通过甲酸电催化氧化性能测试,结果表明,Pd单位质量比活性比Pd/C催化剂提高了2.5倍。

Polypyrrole Modified Carbon-Supported Pd Catalyst for Formic Acid Electrooxidation

The active component of active carbon-supported Pd of the anode catalyst in direct formic acid fuel cell(DFAFC) is easy to aggregate and has electrocorrosive effect on the carbon carrier, resulting in low catalytic activity and stability. In this paper, regulating the carbon catalyst carrier effectively improved the catalytic activity and stability for formic acid electrooxidation. The polypyrrole(PPy) doped carbon was synthesized by low temperature chemical oxidation and activated carbon was added during the polymerization process. Pd catalyst supported on the carbon composites was prepared. The surface morphology of the pyropolypyrrole doped catalyst was characterized. It is found that the Pd nanoparticles could be stabilized at 2.25 nm. The surface nitrogen element of the catalyst exists in the form of pyrrole nitrogen. The carbon-based pyrolytic polypyrrole supported Pd has excellent performance for the formic acid electrocatalytic oxidation. Compared with the Pd/C catalyst, the specific activity per Pd unit mass is increased by 2.5 times.