Zinc-ion hybrid supercapacitors emerge as a promising energy storage device in benefit of the merits from both battery and supercapacitor. However, the challenges induced by the low energy density and poor cycling stability of the cathodes hinder the practical applications of zinc-ion hybrid supercapacitors. To address these issues, a structural engineering of carbonaceous cathode into a hierarchical porous architecture based on a hydrothermal-assisted molecular-scale mixing strategy is proposed. The key structures of the as-fabricated hierarchical porous carbon consist of high specific surface area, well-interconnected hierarchical porous morphology and favorable graphitization degree with good conductivity, which promises great conceptual and technological potential for high-performance zinc ion storage. It is demonstrated that the high specific surface area supply sufficient active sites for zinc ion storage, and collectively, the valuable hierarchical porous structure and high electric conductivity is beneficial for rapid transfer/diffusion of zinc ion. An ultrahigh capacity of 305 mAh g⁻¹, a high energy density of 118 Wh kg⁻¹, good rate capability, and excellent cycling stability of over 94.9% after 20000 cycles at a high current density of 2 A g⁻¹ can be achieved when hierarchical porous carbon (HPC) is used as the cathode of a zinc-ion hybrid supercapacitor.

受益于电池和超级电容器的优点，锌离子混合超级电容器成为有前途的储能设备。然而，由于阴极的低能量密度和较差的循环稳定性引起的挑战阻碍了锌离子混合超级电容器的实际应用。为了解决这些问题，提出了将碳质阴极结构化为基于水热辅助分子尺度混合策略的分级多孔结构的技术。所制备的分级多孔碳的关键结构包括高比表面积，良好互连的分级多孔形态和良好的石墨化度以及良好的导电性，这为高性能锌离子存储提供了巨大的概念和技术潜力。结果表明，高比表面积为锌离子的存储提供了足够的活性位点，总的来说，有价值的分级多孔结构和高电导率有利于锌离子的快速转移/扩散。305 mAh g的超高容量^-1，当使用分级多孔碳（HPC）时，在2 A g ^-1的高电流密度下，在20000次循环后，具有118 Wh kg ^-1的高能量密度，良好的倍率能力和出色的循环稳定性，超过94.9％用作锌离子混合超级电容器的阴极。