Tunable Platform Capacity of Metal–Organic Frameworks via High-Entropy Strategy for Ultra-Fast Sodium Storage

• A novel high-entropy metal–organic frameworks (HE-MOFs) electrode for fast sodium-ion storage devices has been realized by introducing five metallic elements. • The platform capacity/voltage of the electrode materials are precisely regulated by the adjustable metal species/content of HE-MOFs. • The sodium-ion capacitors assembled based on high-entropy MOFs electrode exhibit high-power density (20,000 W kg-1) and high-energy density (99.4 Wh kg-1). • The HE-MOFs material maintains a reversible specific capacity of 89 mAh g−1 at 20 A g−1 and an ideal sodium storage voltage plateau of ~0.5 V, with platform capacity increased to 122.7 mAh g−1.