Zinc-ion hybrid capacitors (ZHCs) have attracted increasing attention due to their advantages such as low cost,improvedsafety and long-term cycling stability. However,despite these advantages,the development of ZHCs is still in its early stages and faces anumber of challenges,such as the growth of electrode dendrites and the energy density is still unsatisfactory. Therefore,it is extremelycrucial to develop reasonably matched electrode materials. Porous carbon materials have become one of the most potential cathodematerials for ZHCs because of the advantages of low price,high porosity and stable performance. However,the low conductivity andinappropriate pore size distribution of traditional porous carbon materials limit their application in ZHCs. It is hoped that the problemscan be tackled through the selection of raw materials and structure design. Herein,the hierarchical porous carbons (HPC/RHCx) wereprepared from rice husk and coal tar pitch using double template of KCl and MgO coupled with K2CO3 activation strategy. TheHPC/RHC6 features interconnected nanocapsule-like structure,large specific surface area (1 234 m/g) and hierarchical pore structure.As the cathode material of ZHCs,HPC/RHC6 exhibits excellent zinc storage performance. At the current density of 0.1 A/g,the specificcapacity of HPC/RHC6 reaches 125.3 mA·h/g,and at the power density of 115.4 W/kg,the energy density is 92.4 W·h/kg. After10 000 cycles of charge and discharge at a current density of 5 A/g,the capacity retention is 99.9%,showing excellent cycle stability.

彭国栋(1999—),男,安徽安庆人,硕士研究生,E-mail:gdpenggd@163.com

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PENG Guodong,ZHU Aoyang,ZHU Yiquan,et al. Rice husk/coal tar pitch based hierarchical porous carbons as thecathode of zinc ion hybrid capacitors[J].Clean Coal Technology,2025,31(1):69−77.