Defect engineering is an effective strategy to enhance the activity of catalysts for various applications. Herein, it was demonstrated that in addition to enhancing surface properties via doping, the influence of dopants on the surface–intermediate interaction is a critical parameter that impacts the catalytic activity of doped catalysts for low-temperature formaldehyde (HCHO) oxidation. The incorporation of Co into the lattice structure of δ-MnO₂ led to the generation of oxygen vacancies, which promoted the formation of surface active oxygen species, reduced activation energy, and enhanced catalytic activity for low-temperature oxidation of HCHO. On the contrary, Cu doping led to a drastic suppression of the catalytic activity of δ-MnO₂, despite its enhanced redox properties and slight increase in the surface concentration of active oxygen species, compared to pristine δ-MnO₂. Diffuse reflectance infrared Fourier transform analysis revealed that in the presence of Cu, carbonate intermediate species accumulate on the surface of the catalysts, leading to partial blockage of active sites and suppression of catalytic activity.

中文翻译：

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钴和铜掺杂物对水钠锰矿MnO ₂催化剂催化低温甲醛氧化的相反作用

缺陷工程是提高催化剂在各种应用中的活性的有效策略。本文证明，除了通过掺杂提高表面性能外，掺杂剂对表面-中间相互作用的影响是影响掺杂催化剂对低温甲醛（HCHO）氧化的催化活性的关键参数。Co的掺入δ-的MnO的晶格结构₂为HCHO的低温氧化导致的氧缺陷，促进表面活性氧种，降低活化能的形成的产生，和增强的催化活性。相反，铜掺杂导致的催化活性的抑制急剧δ-的MnO ₂，尽管它的增强的氧化还原性能和在活性氧种的表面浓度略有增加，相比于原始δ-的MnO ₂。漫反射红外傅里叶变换分析表明，在存在铜的情况下，碳酸盐中间物类积累在催化剂表面，导致部分活性位阻滞并抑制了催化活性。