掺硼金刚石中硼和石墨相含量对燃料电池阴极催化性能影响

摘要

掺硼金刚石是一种理想的燃料电池氧还原反应非金属催化剂阴极材料.报道了掺硼金刚石中硼含量以及sp2杂化的石墨相含量与氧还原反应电位、电流密度之间的关系.研究结果表明,掺硼金刚石中一定含量的硼对催化氧还原反应活性有积极作用.随着硼含量的增加,氧还原反应电位无明显变化,反应活性先增大后减小,变化规律与催化位点和台阶原子密度两个因素有关.sp2杂化石墨相有利于氧还原反应活性电位向正向移动.%Boron-doped diamonds are good candidates as metal-free catalysts for the cathodic oxygen reduction reaction of fuel cells. The relationship between the content of doped boron and sp2 hybridized graphite phase in boron-doped diamonds with the oxygen reduction reaction potential and the current density is investigated.The results show that a certain amount of boron in boron-doped diamonds has a positive effect on the catalytic activity of the oxygen reduction reaction.With the increase of boron content,the oxygen reduction reaction activity increases first and then decreases while there is no significant change in the oxygen reduction reaction potential.Catalytic sites and step atomic density are considered to play a synthetic role.Moreover,sp2 hybridized graphite phase can make the potential of the oxygen reduction reaction shift toward more positive.