氧电极催化剂是制约质子交换膜燃料电池(PEMFCs)发展和应用的一个重要因素,开发低价高效的非贵金属催化剂对PEMFCs来说已成为当务之急.本研究选择氮掺杂的碳载过渡金属(M-N/C)类催化剂为研究对象,以铁盐作为金属前驱体,BP2000为碳源,聚吡咯(PPy)为氮源,对甲基苯磺酸(TsOH)为掺杂剂,合成了非贵金属催化剂Fe-PPy-TsOH/C,探究了不同的热处理温度及钴原子的掺杂对其氧还原催化性能的影响.研究结果表明:800℃制备的Fe-PPy-TsOH/C催化剂因结晶度高、颗粒大小适中且分布均匀而具有最佳的氧还原催化性能;一定量的钴原子取代可以改善Fe-PPy-TsOH/C的氧还原催化性能,当钴的掺杂量为33.33％时(铁钴原子比为2:1),催化剂的性能达到最优.
Cathode catalyst is a dominant parameter hindering the development of proton exchange membrane fuel cells (PEMFCs),exploiting non-precious metal based catalysts with low cost and high activity has become an urgent task in recent decades.In this work,a non-precious metal based catalyst of heat-treated nitrogen doped carbon supported transition metal based catalyst (M-N/C catalyst) was chosen as the subject,and a series of Fe-PPy-TsOH/C catalysts were synthesized with iron salt as the metal precursor,BP 2000 carbon black as the carbon source,polypyrrole (PPy) as the nitrogen source,and methyl benzene sulfonic acid (TsOH) as the dopant.The effects of heat-treatment temperature and cobalt-doping on the phase structure,morphologyand catalytic performance towards oxygen reduction reaction (ORR) were comparatively investigated.It shows that 800℃ is the optimal heat-treatment temperature to prepare high performance Fe-PPy-TsOH/C catalyst.If the iron in the Fe-PPy-TsOH/C catalyst is replaced by appropriate amount of cobalt,its catalytic performance towards ORR could be further improved,and the best ORR performance could be achieved at a cobalt cotent of 33.33％ (Fe∶Co=2∶1 in ratio) in the range of 0-50at％.
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