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High areal capacitance of manganese oxide electrodes with cerium as rare earth modification

机译：具有铈作为稀土改性铈氧化锰电极的高面积电容

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Manganese oxides have attracted wide attention as promising electrode materials for high-energy density supercapacitors. However, the electrochemical performance of the manganese oxide materials deteriorates considerably with the increase in mass loading due to their moderate electronic and ionic conductivities. This phenomenon leads to low areal capacitance, which limits the practical application of these materials. Herein, we perform a potentiostatic electrodeposition of manganese oxides with Ce as rare earth (RE) modification on a nickel (Ni) foam substrate to achieve high areal capacitance. Under optimum conditions, manganese oxide nanosheets are axially grown on Ni foam to form a hierarchically porous network nanostructure, which ensures facile ionic and electric transport. The Ce-modified manganese oxide with the Mn:Ce molar ratio of 1:0.1 yields an outstanding areal capacitance of 3.67 F cm(-2)at 2 mA cm(-2)and a good rate capability compared with the capacitance of 2.59 F cm(-2)at 2 mA cm(-2)of pure manganese oxide without the addition of Ce. This result verifies the importance of Ce modification to manganese oxides. Our results suggest the important role played by the RE element Ce in enhancing the electrochemical performance of high areal capacitance manganese oxide electrodes, which is essential to bringing them one step toward further practical applications.
机译：锰氧化物引起了广泛的关注作为高能量密度超级电容器的有前途的电极材料。然而，由于其中等的电子和离子导电性，氧化锰材料的电化学性能随着质量负荷的增加而显着恶化。这种现象导致低面积电容，这限制了这些材料的实际应用。在此，我们在镍（Ni）泡沫基板上具有Ce作为稀土（RE）改性的锰氧化物的电位电沉积电沉积，以实现高面积的电容。在最佳条件下，锰氧化物纳米片在Ni泡沫上轴向生长，以形成分层多孔网络纳米结构，其确保容易离子和电动运输。具有Mn的Ce改性锰氧化物：Ce摩尔比为1：0.1，与2.59 f的电容相比，在2 mA cm（-2）中的出色的面积电容为3.67 f cm（-2），并且良好的速率能力Cm（-2）在2 mA cm（-2）的纯锰氧化物，没有添加Ce。该结果验证CE改性对氧化锰的重要性。我们的研究结果表明，RE元件CE在提高高面积电容氧化锰电极的电化学性能方面发挥的重要作用，这对于使它们迈向进一步的实际应用至关重要。

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