Carbon/transition metal oxide composites exhibit promising potential as electrode materials for energy storage, but regulating their interfacial composite structures remains a formidable challenge. In this work, we develop a lignosulfonate-assisted synthesis strategy to fabricate a porous carbon-supported MnO₂ composite (LSC/MnO₂-2) with a robust interface for asymmetric supercapacitors (ASCs). The functionalized lignin porous carbon, achieved through π–π interactions with lignosulfonate, exhibited improved dispersibility, thereby facilitating the deposition of MnO₂ onto the carbon matrix. Consequently, LSC/MnO₂-2 demonstrates uniform MnO₂ loading and enhanced interfacial bonding. The robust interaction between Mn sites and the lignosulfonate-functionalized carbon substrate can promote electron transfer and ion transfer kinetics, effectively activating the electrochemical activity of MnO₂. The as-prepared LSC/MnO₂-2 demonstrates high specific capacitances of 750 F/g at 0.5 A/g and 400 F/g at 10.0 A/g in a 1 M KOH electrolyte. Furthermore, the assembled ASC exhibits an outstanding energy density of 54.4 Wh/kg at 998.2 W/kg and excellent cyclic stability (94.7% retention over 10,000 cycles at 2.0 A/g). This study presents an alternative method to precisely control the deposition of metal oxides onto carbon materials, aiming to enhance the performance of carbon composites.

中文翻译：

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木质素磺酸盐辅助合成具有增强界面键合的多孔碳负载 MnO2 复合材料，用于高性能不对称超级电容器

碳/过渡金属氧化物复合材料作为储能电极材料表现出广阔的潜力，但调节其界面复合结构仍然是一个艰巨的挑战。在这项工作中，我们开发了一种木质素磺酸盐辅助合成策略来制造具有用于不对称超级电容器（ASC）的稳健界面的多孔碳支撑的MnO ₂复合材料（LSC/MnO _{2 -2）。通过与木质素磺酸盐的π-π相互作用实现的功能化木质素多孔碳表现出改善的分散性，从而促进MnO 2}在碳基质上的沉积。因此，LSC/MnO ₂ -2表现出均匀的MnO ₂负载和增强的界面结合。 Mn位点与木质素磺酸盐功能化碳基底之间的强大相互作用可以促进电子转移和离子转移动力学，有效激活MnO ₂的电化学活性。所制备的LSC/MnO ₂ -2 在1 M KOH电解质中表现出高比电容，在0.5 A/g下为750 F/g，在10.0 A/g下为400 F/g。此外，组装的ASC在998.2 W/kg下表现出出色的能量密度54.4 Wh/kg和出色的循环稳定性（在2.0 A/g下10,000次循环后保留94.7%）。这项研究提出了一种精确控制金属氧化物在碳材料上沉积的替代方法，旨在提高碳复合材料的性能。