We report a new method of generating catalytic active sites for the oxygen reduction reaction (ORR) through the immobilization of molecular Fe sites in a cationic polymer (CXL-HCP-Fe) via counterion exchange combined with pyrolysis. Pyrolysis at different temperatures leads to the formation of novel non-precious metal catalysts consisting of Fe₃C nanoparticles encapsulated in porous graphitic carbon materials (CXL-HCP-Fe-t). Electrochemical characterization shows that the CXL-HCP-Fe-900 obtained at a pyrolysis temperature of 900 °C has excellent ORR electrocatalytic activity that is comparable to the commercial Pt/C catalyst, and even better catalytic durability. In addition, ⁵⁷Fe Mössbauer spectroscopy, inductively coupled plasma spectrometry and X-ray diffraction measurements show that Fe₃C-based active sites with relatively high crystallinity species and content contribute to the high ORR catalytic activity of CXL-HCP-Fe-900.

我们报告了一种通过抗衡离子交换与热解相结合的方法，通过固定阳离子聚合物（CXL-HCP-Fe）中的分子Fe位点来生成催化活性位点的方法，用于氧还原反应（ORR）。在不同温度下的热解导致形成新型非贵金属催化剂，该催化剂由包裹在多孔石墨碳材料（CXL-HCP-Fe- t）中的Fe ₃ C纳米颗粒组成。电化学特性表明，在900°C的热解温度下获得的CXL-HCP-Fe-900具有与市售Pt / C催化剂相当的ORR电催化活性，甚至具有更好的催化耐久性。另外⁵⁷FeMössbauer光谱，电感耦合等离子体光谱和X射线衍射测量表明，具有较高结晶度和含量的Fe ₃ C基活性位点有助于CXL-HCP-Fe-900的高ORR催化活性。