Advanced integrated nanoarray (NA) catalysts have been designed by growing metal-doped Co₃O₄ arrays on nickel foam with robust adhesion. Ternary MCo₂O₄ NA catalysts were prepared by doping urchin-like Co₃O₄ with different transition metals (Cu²⁺, Mn²⁺, Fe²⁺, Ni²⁺, Zn²⁺, Fe³⁺ and Al³⁺). These catalysts exhibited novel morphologies and can be directly applied as monolithic materials for CO oxidation. Among the MCo₂O₄ NA catalysts, CuCo₂O₄ nanoneedles manifested the highest catalytic activity in dry air, achieving an efficient 100% CO oxidation conversion of 20 000 h⁻¹ at 146 °C, due to its reducibility at lower temperature, lattice distortion of the spinel structure, and abundant surface-adsorbed oxygen (O_ads). The doped catalytic systems were further optimized by controlling the volume ratio of reactive components in the mixed solvent, the Cu or Mn contents to determine excellent catalysts for direct application to CO oxidation at 1.0 vol% moisture. Penthorum chinense-like MnCo₂O₄ NAs showed optimal catalytic performance at 1 vol% moisture (T₁₀₀ = 175 °C), with activity higher than that of the CuCo₂O₄ NA catalyst, indicating that the synergistic effect between MnO_x and Co₃O₄ improved the moisture resistance and stability. It was concluded that the moisture resistance provided by introducing active sites on Co-based catalysts decreased as follows: Mn sites > Co sites > Cu sites > Ni sites. MCo₂O₄ NAs, with predominantly exposed {110} surfaces, showed higher catalytic activity than catalysts with exposed {111} surfaces. This study suggests that the as-prepared MnCo₂O₄ NAs anchored on 3D Ni foam with remarkable moisture resistance have potential applications in CO oxidation.

中文翻译：

---

固定在三维Ni泡沫上的 整合的拟除草的类似于chinense chinense的MnCo ₂ O ₄阵列上的低温CO氧化†

先进的集成纳米阵列（NA）催化剂是通过在镍泡沫上生长具有坚固附着力的掺杂金属的Co ₃ O ₄阵列而设计的。通过用不同的过渡金属（Cu 2 ⁺，Mn 2 ⁺，Fe 2 ⁺，Ni 2 ⁺，Zn 2 ⁺，Fe ³⁺和Al ^3+）掺杂类顽固的Co ₃ O ₄来制备三元MCo ₂ O ₄ NA催化剂。）。这些催化剂表现出新颖的形态，可以直接用作用于CO氧化的整体材料。在MCo ₂ O ₄ NA催化剂中，CuCo ₂O ₄纳米针在干燥空气中表现出最高的催化活性，由于其在较低温度下的还原性，尖晶石结构的晶格畸变和丰富的表面活性，在146°C时可实现20 000 h ^-1的有效100％CO氧化转化。吸附的氧气（O _ads）。通过控制混合溶剂中反应性组分的体积比，Cu或Mn含量，可以进一步优化掺杂的催化体系，从而确定可直接应用于水分含量为1.0 vol％的CO氧化的优异催化剂。猪对虾类MnCo ₂ O ₄ NAs在湿度为1％（T ₁₀₀ = 175°C）时表现出最佳的催化性能，其活性高于CuCo。₂ O ₄ NA催化剂，表明MnO _x和Co ₃ O ₄的协同作用提高了耐湿性和稳定性。结论是，通过在Co基催化剂上引入活性位而提供的耐湿性降低如下：Mn位> Co位> Cu位> Ni位。具有主要暴露的{110}表面的MCo ₂ O ₄ NAs显示出比具有暴露的{111}表面的催化剂更高的催化活性。这项研究表明，固定在3D Ni泡沫上且具有出色的耐湿性的MnCo ₂ O ₄ NAs可能在CO氧化中具有潜在的应用。