A series of Co_xFe_1-x-PNS materials were synthesized at room temperature through the one-pot MgO-mediated method and were then used as catalysts for soot oxidation. Of all the catalyst samples prepared, the porous Co_0.8Fe_0.2-PNS nanosheets exhibited the highest catalytic performance for soot oxidation under both loose and tight contact modes. The 2D nanosheets provided a larger external surface area for contact between the catalyst and soot, and the porous structure was beneficial to the adsorption and diffusion of reactant gas. It was found that Fe was successfully doped in the lattice of Co₃O₄, and the mechanism regarding how Fe doping enhances intrinsic activity was investigated by a series characterization and DFT calculations. The results indicated that Fe doping made it easier to form oxygen vacancies and adsorb gaseous O₂, which effectively improved the catalytic activity of soot oxidation. Hence, it is believed that the synergy between the well-defined porous nanosheets morphology and the properties induced by the doping of Fe resulted in better catalytic activity. This study also provided insight into the design of 2D transition metal oxides nanosheets as catalysts for soot oxidation.

通过一锅MgO介导的方法在室温下合成了一系列Co _x Fe _1-x -PNS材料，然后用作烟灰氧化的催化剂。在制备的所有催化剂样品中，多孔 Co _0.8 Fe _0.2 -PNS 纳米片在松散和紧密接触模式下均表现出最高的烟尘氧化催化性能。二维纳米片为催化剂和烟尘之间的接触提供了更大的外表面积，多孔结构有利于反应气体的吸附和扩散。发现在Co ₃ O ₄的晶格中成功掺杂了Fe，并通过一系列表征和 DFT 计算研究了关于 Fe 掺杂如何增强内在活性的机制。结果表明，Fe的掺杂更容易形成氧空位和吸附气态O ₂，有效提高了烟尘氧化的催化活性。因此，据信，明确定义的多孔纳米片形态与 Fe 掺杂引起的性质之间的协同作用导致更好的催化活性。该研究还提供了对 2D 过渡金属氧化物纳米片作为烟尘氧化催化剂的设计的见解。