In Situ Synthesis of Manganese Oxide as an Oxygen‐Evolving Catalyst: A New Strategy

Abstract

All studies on oxygen-evolutionr eaction by Mn oxides in the presence of cerium(IV)a mmonium nitrate (CAN) have been so far carriedo ut by synthesizing Mn oxides in the first step. And then, followed by the investigation of the Mn oxides in the presence of oxidants for oxygen-evolution reaction (OER). This paperp resents ac ase study of an ew and promising strategy for in situ catalyst synthesis by the adding Mn II to either CAN or KMnO 4 /CAN solution, resulting in the formationo fM n-based catalysts for OER. The catalysts were characterized by scanning electron microscopy,e nergy-dispersive spectroscopy,t ransmission electron microscopy,X-ray diffraction, Fourier transform infrared spectroscopy,X-ray absorption spectroscopy,a nd Xray photoelectron spectroscopy. Both compounds contained nano-sized particlest hat catalyzed OER in the presenceo f CAN. The turnover frequencies for both catalysts were 0.02 (mmol O 2 /mol Mn •s).

Manganese-Based Catalysts for Indoor Volatile Organic Compounds Degradation with Low Energy Consumption and High Efficiency

“…Although noble metal-based catalysts possess the advantages of high efficiency and low ignition temperature, the great cost and poor thermal stability limit their wide application [58]. Transition metal-based catalysts generally have the advantages of excellent stability and low cost; however, they suffer from low catalytic efficiency [36,[38][39][40][41]59]. Mn, a typical earth-abundant transition metal with diverse valence states, is widely used in catalytic reaction [60].…”

“…Mn-based catalysts have been widely studied in thermocatalytic degradation of VOCs; however, the catalytic activities still need to be improved [42,61]. In view of the existing problems, researchers have improved the activity and stability of Mn-based catalyst by means of structural design and decorating modification [36,38,39,42,[61][62][63][64].…”

“…Till now, a large number of catalysts including noble metals and transition metal oxides have been developed for catalytic oxidation of VOCs. Among them, manganesebased catalysts have attracted tremendous attention due to their excellent catalytic performance, unique structure, large specific surface area, excellent adsorption ability and low cost [36,[38][39][40][41]. Lots of progresses have been made using manganese-based catalysts for the degradation of VOCs [28,35,[42][43][44].…”