Alkaline metal ion batteries are considered to be promising candidates in the energy storage domain, whereas the sluggish adsorption and diffusion ability by large radius of Na⁺/K⁺ constrain the large-scale application. Herein, we report the strongly coupled WSe₂ with P, N dual-doped carbon nanosheets (WSe₂/PNCNS) served as an anode electrode material, manifesting high specific capacities and superior cycling stability for both sodium and potassium ion storage. Theoretical calculation results demonstrate that the strongly coupled hybrids can achieve nearly zero diffusion barriers to enhance ion diffusion kinetics and adsorption energies, which could underpin the robust Na⁺/K⁺ storage capacity. Importantly, the potassium ion hybrid capacitors (KIHCs) display a high energy density of 111.9 Wh kg⁻¹ and long cycle life with 84.9% capacity retention after 10,000 cycles. This work not only offers the guide on regulating the diffusion kinetics, but it also paves the way on practical applications for Na⁺/K⁺ storage.

碱金属离子电池被认为是储能领域有前途的候选者，而大半径Na + ^/ K ⁺的缓慢吸附和扩散能力限制了大规模应用。在此，我们报告了强耦合的 WSe ₂与 P、N 双掺杂碳纳米片 (WSe ₂ /PNCNS) 作为阳极电极材料，表现出高比容量和优异的钠离子和钾离子存储循环稳定性。理论计算结果表明，强耦合杂化物可以实现几乎为零的扩散势垒，以增强离子扩散动力学和吸附能，这可以支撑稳健的 Na ⁺ / K ⁺存储容量。^{重要的是，钾离子混合电容器 (KIHC) 显示出 111.9 Wh kg −1}的高能量密度和长循环寿命，在 10,000 次循环后容量保持率为 84.9%。^{这项工作不仅为调节扩散动力学提供了指导，而且还为 Na +} /K ⁺存储的实际应用铺平了道路。