In the field of supercapacitors, carbide MXenes have recently received significant attention as pseudocapacitive electrode materials due to their unique multilayered structure, high metallic conductivity, pseudocapacitive charge storage mechanism and tunable surface terminations. Herein, synthesis and electrochemical performance of 2D molybdenum carbide (Mo₂C) MXene-based electrode is presented for supercapacitor applications. Mo₂C MXene was synthesized by using simple solid-state thermal reduction technique. The crystalline structure, surface morphologies, specific capacitance, electronic conductivity and reaction kinetics of as-synthesized Mo₂C MXene were examined using XRD (X-ray diffraction) analysis, FESEM (field emission scanning electron microscopy), CV (cyclic voltammetry) and EIS (electrochemical impedance spectroscopy) measurements, respectively. The hexagonal phase (with P6₃/mmc symmetry) of Mo₂C MXene was confirmed by XRD analysis. The 2D multilayered structure was displayed by FESEM results. The cyclic voltammograms revealed an efficient electrochemical performance of 2D Mo₂C MXene. Due to its high current density, large surface area and abundance of redox acive sites, MXene-based electrode displayed high specific capacitance of 916 F/g at 5 mV/s. Further, excellent electronic conductivity and minimum charge transfer resistance was observed by EIS plots. The significant electrochemical performance of Mo₂C MXene-based electrode governs its implementation for developing highly efficient supercapacitors with high energy and power densities.

中文翻译：

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用于超级电容器应用的 2D 碳化钼 （MXene） 的合成和电化学性能


在超级电容器领域，碳化物 MXenes 由于其独特的多层结构、高金属导电性、伪电容电荷存储机制和可调表面端接，最近作为伪电容电极材料受到广泛关注。本文介绍了用于超级电容器应用的 2D 碳化钼 （Mo₂C） MXene 基电极的合成和电化学性能。采用简单的固相热还原技术合成了 Mo₂C MXene。分别使用 XRD （X 射线衍射） 分析、FESEM （场发射扫描电子显微镜）、CV （循环伏安法） 和 EIS （电化学阻抗谱） 测量检查合成的 Mo₂C MXene 的晶体结构、表面形貌、比电容、电子电导率和反应动力学。通过 XRD 分析证实了 Mo₂C MXene 的六方相 （P6₃/mmc 对称性）。FESEM 结果显示了 2D 多层结构。循环伏安图揭示了 2D Mo₂C MXene 的高效电化学性能。由于其高电流密度、大表面积和丰富的氧化还原活性位点，MXene 基电极在 5 mV/s 时显示出 916 F/g 的高比电容。此外，通过 EIS 图观察到优异的电子导电性和最小的电荷转移电阻。Mo₂C MXene 基电极的显着电化学性能决定了其在开发具有高能量和功率密度的高效超级电容器方面的实施。