Pt Anchored on Mn(Co)CO₃/MnCo₂O₄ Heterostructure for Complete Oxidation of Formaldehyde at Room Temperature

Abstract

Mn(Co)CO3/MnCo2O4 hybrids were prepared via a hydrothermal following by heat‐treatment process and used as novel supports of Pt nanoparticles for formaldehyde (HCHO) removal at room temperature. The catalyst heat‐treated at 150 °C had a primary nanorod‐like morphology, however, its well‐defined structure was obviously collapsed when the heat‐treatment temperature was above 350 °C. In the static experiment where indoor HCHO removal was simulated at room temperature, the catalyst heat‐treated at 150 °C with only 0.4 wt % Pt showed the best catalytic activity among the investigated samples, which possessed a HCHO removal efficiency of 92.2 % in 60 min under the initial HCHO concentration at approximately 180 ppm. The unique nanorod feature and heterogeneous interface between MnCo2O4 and Mn(Co)CO3 (MnCO3 and CoCO3) with a proper weight ratio are the main contributions to the superior catalytic performance of the catalyst by boosting the charge transfer and active oxygen species formation in the process of HCHO catalytic oxidation reaction. Our work indicates that well‐defined morphological heterostructures which facilitate the charge migration and formation of reactive oxygen species, could be the potential alternative catalysts in the enhancement of HCHO decomposition at room temperature.