Designing hierarchical porous structures is widely recognized as an effective strategy to improve ion transport and create active sites for disordered carbon anodes of sodium-ion batteries (SIBs). Herein, hierarchical porous hard carbon (hp-HC) is synthesized using zinc acetate as a templating agent. The hierarchical porous structure facilitates effective Na⁺ ion storage with a high reversible capacity of 327 mA h g⁻¹ at a current density of 0.1 A g⁻¹. Notably, the sodium storage behavior is capacitance-dominated, with the capacity primarily characterized by slope capacity. Additionally, the hp-HC retains 94.5 % of its capacity after 6000 cycles at 1.0 A g⁻¹. This work provides a convenient route for manipulating pore types, which is of great significance for developing high-capacity hard carbon electrodes for enhanced sodium-ion storage.

中文翻译：

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用于增强钠离子储存的斜面型硬碳多级孔工程


设计多级多孔结构被广泛认为是改善离子传输和为钠离子电池 （SIB） 的无序碳负极创建活性位点的有效策略。在此，使用乙酸锌作为模板剂合成了多级多孔硬碳 （hp-HC）。多级多孔结构有助于有效的钠 ⁺ 离子储存，在 0.1 A g ⁻¹ 的电流密度下具有 327 mA h g ⁻¹ 的高可逆容量。值得注意的是，钠储存行为以电容为主，容量主要以斜率容量为特征。此外，hp-HC 在 1.0 A g ⁻¹ 下循环 6000 次后仍能保留 94.5% 的容量。这项工作为纵孔型提供了一条便捷的途径，对于开发用于增强钠离子储存的高容量硬碳电极具有重要意义。