The combination of the high-power density of supercapacitors and the high energy density of batteries makes hybrid sodium-ion capacitors (HSICs) a promising device. HSICs can provide better performance characteristics by harnessing both ion adsorption/desorption in the capacitor-type electrode and sodium-ion intercalation in the battery-type electrode. Here, the synthesis of MXene (Ti3C2Tx), a two-dimensional (2D) carbide and nitride is reported. Delaminated MXene (D-Ti3C2Tx) is a promising candidate for anode material in HSIC due to its large surface area (∼ 42 m2/g) and good electronic conductivity. Electrochemical study indicates that D-Ti3C2Tx anode exhibits a high discharge capacity of ∼213 mAh/g at a current rate of 20 mA/g. Further the presodiated D-Ti3C2Tx anode is paired with Na [Ni0.60Mn0.35Co0.05] O2 (P2-NMC) cathode to obtain the configuration of HSIC. The HSIC exhibits good specific capacitance of ∼187 F/g and specific discharge capacity of ∼110 mAh/g at a current density of 10 mA/g, according to the electrochemical analysis. A notable improvement in specific energy density (∼ 256 Wh/kg) and specific power density (∼579 W/kg) is also demonstrated by the HSIC. With P2-NMC being used as the cathode material rather than traditional activated carbon, there has been a rise in specific energy density.

中文翻译：

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基于Na[Ni0.60Mn0.35Co0.05]O2电池型阴极和预处理D-Ti3C2TX赝电容阳极的新型混合钠离子电容器


超级电容器的高功率密度和电池的高能量密度的结合使混合钠离子电容器（HSIC）成为一种有前途的设备。通过利用电容器型电极中的离子吸附/解吸和电池型电极中的钠离子嵌入，HSIC 可以提供更好的性能特征。在此，报道了 MXene (Ti3C2TX)、一种二维 (2D) 碳化物和氮化物的合成。分层 MXene (D-Ti3C2TX) 因其大表面积 (∼ 42 m2/g) 和良好的电子导电性而成为 HSIC 阳极材料的有前途的候选材料。电化学研究表明，D-Ti3C2TX 负极在 20 mA/g 的电流倍率下表现出~213 mAh/g 的高放电容量。此外，预处理的 D-Ti3C2TX 阳极与 Na [Ni0.60Mn0.35Co0.05] O2 (P2-NMC) 阴极配对以获得 HSIC 的构型。根据电化学分析，HSIC 在 10 mA/g 的电流密度下表现出良好的比电容（约 187 F/g）和比放电容量（约 110 mAh/g）。 HSIC 还证明了比能量密度（∼ 256 Wh/kg）和比功率密度（∼579 W/kg）的显着改善。使用P2-NMC代替传统活性炭作为正极材料，比能量密度有所提高。