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Molybdenum Doped Manganese Oxide as a Highly Efficient and Economical Water Oxidation Catalyst

wallpapers News 2021-04-25
Molybdenum Doped Manganese Oxide as a Highly Efficient and Economical Water Oxidation Catalyst
 
The development of efficient, precious metal-free electrocatalysts for challenging oxygen evolution reactions (OER) is key to sustainable energy solutions. In this paper, a simple co-precipitation method was used to synthesize low-cost water electrooxidation catalyst -α-Mn2O3 doped materials (Mn2O3:1.72%Mo, Mn2O3:2.64%Mo, Mn2O3:32.23%Mo, Mn2O3:49.67%Mo) in N2/ air after thermal synthesis. Powder X-ray diffraction (PXRD), extended X-ray absorption fine structure (EXAFS), X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HRTEM) studies show that the molybdenum doped α-Mn2O3 main lattice (Mn2O3:2.64%Mo) has strong distortion, and the average oxidation state is Mn2.8+.Several test analyses showed that these structural features significantly promoted OER activity.Mn2O3:2.64%Mo found that the series exhibited very good activity in ammonium cerium nitrate (which can) subsidize the construction of water oxidation with the highest turnover frequency (TOF) of 585 μmol O2 of H-M -2, This is a 15-fold increase in pure α-Mn2O3 activity and is higher than the previously reported value of the benchmark Mn-based catalyst, Birnessite. The optimized catalyst (Mn2O3:2.64%Mo) excelled through a low incidence potential (300 mV) and a promising overvoltage of 570 mV 10 mA cm-2 OER with a current density that was only 20 mV higher than the benchmark RuO2 precious metal electrode and competed with the most active Mn-based catalyst at the reporting date. Electrochemical impedance spectroscopy (EIS) showed that the catalytic activity of Mn2O3:2.64%Mo for OER was much higher than that of α-Mn2O3.In addition, the catalyst remained stable and non-degradable for 30 h, exceeding the current wide range of precious metal-free electrocatalysts. This study provides a simple and effective way to prepare an economical and efficient electrooxidation catalyst for Mn-based water.
 
High activity (YE-A01) natural manganese dioxide (YE-A09) is directly used as the cathode material of batteries. Over time, its resources have been depleted. The research on the use of low activity and high-grade natural manganese dioxide has always been the focus of research and assistance for scientists in the manganese industry and battery industry. Based on a large number of experiments, an activation system of "disproportionation activation with electrolytic manganese dioxide (EMD) electrolyte as an acidic medium, adding a small amount of NaClO3 and aluminum-containing polychloride" was proposed. The roasting, disproportionation activation and optimal combination of activation system for active manganese dioxide were studied in depth.

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Tag: Doped   Molybdenum   Manganese   and   Highly   Efficient   oxide