Tong Lei, Wang Yu-Cheng, Chen Ming-Xi, Chen Zhi-Qing, Yan Qiang-Qiang, Yang Cheng-Long, Zhou Zhi-You, Chu Sheng-Qi, Feng Xinliang, Liang Hai-Wei
Hefei National Laboratory for Physical Sciences at the Microscale , Department of Chemistry , University of Science and Technology of China , Hefei , 230026 , China . Email:
State Key Laboratory of Physical Chemistry of Solid Surfaces , Collaborative Innovation Center of Chemistry for Energy Materials , College of Chemistry and Chemical Engineering , Xiamen University , Xiamen , 361005 , China.
Chem Sci. 2019 Jul 22;10(35):8236-8240. doi: 10.1039/c9sc01154d. eCollection 2019 Sep 21.
The development of high-performance non-platinum group metal (non-PGM) catalysts for the oxygen reduction reaction (ORR) is still of significance in promoting the commercialization of proton exchange membrane fuel cells (PEMFCs). In this work, a "hierarchically porous carbon (HPC)-supporting" approach was developed to synthesize highly ORR active Fe-phenanthroline (Fe-phen) derived Fe-N -C catalysts. Compared to commercial carbon black supports, utilizing HPCs as carbon supports can not only prevent the formation of inactive iron nanoparticles during pyrolysis but also optimize the porous morphology of the catalysts, which eventually increases the amount of reactant-accessible and atomically dispersed Fe-N active sites. The prepared catalyst therefore exhibits a remarkable ORR activity in both half-cells (half-wave potential of 0.80 V in 0.5 M HSO) and H-air PEMFCs (442 mA cm at a working voltage of 0.6 V), making it among the best non-PGM catalysts for PEMFCs.
开发用于氧还原反应（ORR）的高性能非铂族金属（non-PGM）催化剂对于推动质子交换膜燃料电池（PEMFC）的商业化仍具有重要意义。在这项工作中，开发了一种“分级多孔碳（HPC）负载”方法来合成具有高ORR活性的菲咯啉铁（Fe-phen）衍生的Fe-N-C催化剂。与商业炭黑载体相比，使用HPC作为碳载体不仅可以防止热解过程中形成无活性的铁纳米颗粒，还可以优化催化剂的多孔形态，最终增加可接触反应物且原子分散的Fe-N活性位点的数量。因此，所制备的催化剂在半电池（在0.5 M HSO中半波电位为0.80 V）和氢-空气PEMFCs（在0.6 V工作电压下为442 mA cm）中均表现出显著的ORR活性，使其成为用于PEMFCs的最佳非PGM催化剂之一。
