Potassium-ion hybrid capacitors (PIHCs) have been considered as promising potentials in mid- to large-scale storage system applications owing to their high energy and power density. However, the process involving the intercalation of K⁺ into the carbonaceous anode is a sluggish reaction, while the adsorption of anions onto the cathode surface is relatively faster, resulting in an inability to exploit the advantage of high energy. To achieve a high-performance PIHC, it is critical to promote the K⁺ insertion/desertion in anodic materials and design suitable cathodic materials matching the anodes. In this study, we propose a facile “homologous strategy” to construct suitable anode and cathode for high-performance PIHCs, that is, unique multichannel carbon fiber (MCCF)-based anode and cathode materials are firstly prepared by electrospinning, and then followed by sulfur doping and KOH activation treatment, respectively. Owing to a multichannel structure with a large interlayer spacing for introducing S in the sulfur-doped multichannel carbon fiber (S-MCCF) composite, it presents high capacity, super rate capability, and long cycle stability as an anode in potassium-ion cells. The cathode composite of activated multichannel carbon fiber (aMCCF) has a considerably high specific surface area of 1445 m² g⁻¹ and exhibits outstanding capacitive performance. In particular, benefiting from advantages of the fabricated S-MCCF anode and aMCCF cathode by homologous strategy, PIHCs assembled with the unique MCCF-based anode and cathode show outstanding electrochemical performance, which can deliver high energy and power densities (100 Wh kg⁻¹ at 200 W kg⁻¹, and 58.3 Wh kg⁻¹ at 10,000 W kg⁻¹) and simultaneously exhibit superior cycling stability (90% capacity retention over 7000 cycles at 1.0 A g⁻¹). The excellent electrochemical performance of the MCCF-based composites for PIHC electrodes combined with their simple construction renders such materials attractive for further in-depth investigations of alkali-ion battery and capacitor applications.

钾离子混合电容器（PIHC）因其高能量和功率密度而被认为在中大型存储系统应用中具有广阔的应用前景。然而，K ⁺嵌入碳质阳极的过程是一个缓慢的反应，而阴离子在阴极表面的吸附相对较快，导致无法发挥高能量的优势。要实现高性能 PIHC，关键是要推广 K ⁺插入/离开阳极材料，并设计与阳极匹配的合适阴极材料。在这项研究中，我们提出了一种简便的“同源策略”来构建适合高性能 PIHC 的阳极和阴极，即首先通过静电纺丝制备独特的多通道碳纤维 (MCCF) 基阳极和阴极材料，然后再通过分别进行硫掺杂和KOH活化处理。由于在硫掺杂多通道碳纤维（S-MCCF）复合材料中引入了具有大层间距的多通道结构，它作为钾离子电池的阳极具有高容量、超倍率能力和长循环稳定性。活性多通道碳纤维（aMCCF）阴极复合材料具有相当高的比表面积，达到 1445 m ² g^-1并表现出出色的电容性能。特别是，得益于通过同源策略制造的 S-MCCF 阳极和 aMCCF 阴极的优势，由独特的 MCCF 基阳极和阴极组装的 PIHC 表现出出色的电化学性能，可以提供高能量和功率密度（100 Wh kg ^-1在 200 W kg ^-1和 58.3 Wh kg ^-1在 10,000 W kg ^{-1下），同时表现出优异的循环稳定性（在 1.0 A g -1}下 7000 次循环后的容量保持率为 90%）。用于 PIHC 电极的 MCCF 基复合材料的优异电化学性能与其简单的结构相结合，使此类材料对于进一步深入研究碱离子电池和电容器应用具有吸引力。