Electrochemical Activation of 2D MXene‐Based Hybrid for High Volumetric Mg‐Ion Storage Capacitance,Batteries & Supercaps

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Electrochemical Activation of 2D MXene‐Based Hybrid for High Volumetric Mg‐Ion Storage Capacitance
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-02-11 , DOI: 10.1002/batt.201900185
Min Gyu Jung ₁ , Girish Sambhaji Gund ₁ , Yury Gogotsi ₂ , Ho Seok Park _{1,

3}

Affiliation

Electrochemical capacitors are considered as a strong candidate of energy storage device due to their high power density and long cycle lifetime. However, commercial carbon‐based electrochemical capacitors provide only about 60 F cm⁻³ of volumetric capacitance due to low packing density and intrinsic areal capacitance. Two‐dimensional (2D) transition metal carbides/nitrides, known as MXenes, have received attention due to their high electronic conductivity, surface modification, and abilities to achieve superior ion intercalation and packing density. Here, we report the improved volumetric Mg‐ion storage capacitance of 2D MXene/reduced graphene oxide (rGO) hybrid through electrochemical activation. Along with high volumetric capacitance of 439 F cm⁻³ at 2 mV s⁻¹, MXene/rGO hybrid electrode exhibits superior capacitive retention of 87 % after 10,000 cycles in aqueous Mg‐ion system. Thus, our hybrid electrode and electrochemical activation approach opens new avenues to store Mg and other multivalent ions for high volumetric capacitance of electrochemical capacitors.

中文翻译：

2D MXene基杂化材料的电化学活化，可实现高容量的镁离子存储电容

电化学电容器由于其高功率密度和长循环寿命而被认为是能量存储设备的强大候选者。然而，由于低的堆积密度和本征面电容，商用碳基电化学电容器仅提供约60 F cm ^-3的体积电容。二维（2D）过渡金属碳化物/氮化物，称为MXene，由于其高电导率，表面改性以及实现优异的离子嵌入和堆积密度的能力而受到关注。在这里，我们报告了通过电化学活化改善的二维MXene /还原氧化石墨烯（rGO）杂化物的体积Mg离子存储电容。在2 mV s ^-1时具有439 F cm ^-3的高体积电容，MXene / rGO混合电极在水性Mg离子系统中经过10,000次循环后，电容保持率高达87％。因此，我们的混合电极和电化学活化方法为储存Mg和其他多价离子开辟了新途径，以实现电化学电容器的高容量电容。

更新日期：2020-02-11

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