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Effect of Fluoride Ions on Oxygen Reduction and Evolution Reaction at α-MnO2 Cathode

机译:氟离子对α-MnO 2 阴极上氧还原反应及析出反应的影响

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Development of electrode materials and electrolytes with low overpotentials during oxygen reductionreaction (discharging) and oxygen evolution reaction (charging) is essential for achieving highefficiency in aqueous Li-air batteries. -MnO2 was hydrothermally synthesized and used as anelectrode to investigate its possible application in an aqueous Li-air battery. The electrolyte wasmodified by the addition of trace amounts of halide anions and alkali metal cations. Fluoride anionsand potassium cations are most effective in reducing the overpotential of oxygen reduction andevolution reactions. Electrochemical studies and XPS analysis support the fact that the specific- adsorption of F inside the double layer changes the oxidation state from Mn(IV) to Mn(III), resultingin an increase in catalytic activity for oxygen reduction/evolution reactions.
机译:氧还原反应(放电)和氧析出反应(充电)过程中低电势低的电极材料和电解质的开发对于在水性锂空气电池中实现高效率至关重要。 -MnO2是水热合成的,并用作电极来研究其在水性锂空气电池中的可能应用。通过添加痕量的卤化物阴离子和碱金属阳离子对电解质进行改性。氟化物阴离子和钾阳离子在减少氧还原和放出反应的过电位方面最有效。电化学研究和XPS分析支持以下事实:F在双层中的特异性吸附将氧化态从Mn(IV)转变为Mn(III),从而导致氧还原/释放反应的催化活性增加。

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