Electrochemical energy storage (EES) devices with high‐power density such as capacitors,
supercapacitors, and hybrid ion capacitors arouse intensive research passion. Recently …

Potassium ion energy storage devices are competitive candidates for grid-scale energy
storage applications owing to the abundancy and cost-effectiveness of potassium (K) …

Currently, tremendous efforts have been made to obtain a single efficient energy storage
device with both high energy and power density, bridging the gap between supercapacitors …

Hard carbon (HC) is a promising anode material for K+-storage due to its randomly oriented
turbostratic structure. However, most reported HC anodes exhibit low initial coulombic …

Limited lithium resources have promoted the exploration of new battery technologies.
Among them, potassium‐ion batteries are considered as promising alternatives. At present …

Alkali metal‐ion capacitors integrate two electrodes from both batteries and supercapacitors
(SCs), combining the advantages of large capacity, high‐rate performance, and long cycle …

The sodium (potassium)‐metal anodes combine low‐cost, high theoretical capacity, and
high energy density, demonstrating promising application in sodium (potassium)‐metal …

Hard carbons with low cost and high specific capacity hold great potential as anode
materials for potassium‐based energy storage. However, their sluggish reaction kinetics and …