“…Volatile organic compounds (VOCs), emitted by various industrial processes and residential activities, have drawn worldwide attention because of their adverse impact on air quality and human health. , Catalytic oxidation is an effective method to control the emission of VOC, and the utmost priority for this technology is the development of highly efficient catalysts. − Generally, the catalysts could be classified into two categories, i.e., the noble metal-based catalysts and the transition metal oxide-based catalysts. , Among them, manganese dioxide (MnO 2 ) can be regarded as one of the most promising candidates due to its nature of low cost, substantial reserves, changeable crystal structures (α-, β-, γ-, δ-, and λ-MnO 2 ), and varying valences (Mn 2+ , Mn 3+ , and Mn 4+ ). − However, compared to the noble metal-based catalysts, the catalytic activity of MnO 2 at low temperatures is inferior, which is the major obstacle to its large-scale practical application. , …”