Cobalt-based catalysts were synthesized through the evolution of Co₃O₄ nanoparticles into holey nanosheets. The holey Co-Ce oxide nanosheets were found to have the highest activity and stability for soot combustion at loose contact mode as a result of the successful doping of trace amount of Ce ions in Co₃O₄, which improves the intrinsic activity. Additionally, better solid-solid contact was also achieved on holey Co-Ce oxide nanosheets because of the mesoporous structure and large external surface formed. The catalytic mechanism was investigated with in-situ Raman spectra, which indicated that the superoxide species and ${\text{O}}_2^{\text{δ}-}$ (0 < $\text{δ}$ < 1) species had reacted with soot preferentially, and the weakly bonded oxygen species had a low temperature activity even in the absence of O₂. Overall, this study indicated that the two-dimensional (2D) holey Co-Ce nanosheets exhibited superior catalytic performance for soot combustion, which is of great significance for future applications.

通过将Co ₃ O ₄纳米颗粒演化为多孔纳米片，合成了钴基催化剂。由于成功地将痕量的Ce离子掺杂到Co ₃ O _4中，发现多孔的Co-Ce氧化物纳米片在松散接​​触模式下具有最高的烟灰燃烧活性和稳定性，从而提高了固有活性。另外，由于中孔结构和形成的大外表面，在多孔的Co-Ce氧化物纳米片上也实现了更好的固-固接触。用原位拉曼光谱研究了催化机理。${\text{Ø}}_2^{\text{δ}--}$ （0 < $\text{δ}$<1）物种优先与烟灰反应，弱结合的氧物种即使在没有O ₂的情况下也具有低温活性。总体而言，这项研究表明二维（2D）多孔Co-Ce纳米片对烟尘燃烧表现出优异的催化性能，这对未来的应用具有重要意义。