三聚氰胺甲醛树脂废弃物制备氧还原电催化剂研究

在燃料电池阴极催化剂的研究中，FeNx/C材料与目前广泛应用在燃料电池中的Pt基催化剂相比，不仅价格低廉，而且表现出良好的氧还原催化活性. 尽管如此，设计合成性能高、成本低的FeNx/C催化剂仍面临巨大挑战. 在此，作者提出废物利用的方法，以三聚氰胺甲醛树脂固体废物为前驱体，合成了具备介孔结构和较大的比表面积的非贵金属催化剂. 经酸性条件半电池测试，这种电催化剂的氧还原催化活性接近5%商业Pt/C性能. 本文工作为三聚氰胺甲醛树脂固体废弃物处理提供了新思路.

Recycling MF Solid Waste into Mesoporous Nitrogen-doped Carbon with Iron Carbide Complex in Graphitic Layers as An efficient Catalyst for Oxygen Reduction Reaction

Nitrogen-doped carbon materials with iron ions are known as catalytic growth agents for the oxygen reduction reaction (ORR) in fuel cells, but the design and synthesis of high-performance and low-cost catalysts still remain a significant challenge. Herein, we present a cost-effective approach to dispose of MF solid waste as the precursor for the synthesis of MCFes catalyst with the favorable structure features such as the high specific surface area, abundant active sites and suitable pore structure. The results showed that the MCFe-10/10/2 had specific surface area as high as 780.7 m²•g^-1 and high efficient catalytic activity comparable to commercial 5% Pt/C catalyst for the ORR in acid media. Furthermore, the influences in the contents of N through heat-treated at NH₃ atmosphere were also investigated in detail. It was found that the catalytic activity was sensitive to N type, particularly the ratio of pyridinic-N to total N atoms. The large N contents did not lead to higher ORR activities ofMCFes and NMCFe-10/10/2. While the pyridinic N content improved the onset potential for ORR. Furthermore, iron carbide nanoparticles were well encapsulated in N-doped graphene-like layers, which determined the limiting current density. This judicious transformation of organic-rich waste not only addresses the disposal issue, but also generates valuable functional carbon materials from the discard. The as-synthesized carbon will certainly have greater economic ramifications by creating value added materials from wastes.