Research on metal-ion hybrid capacitors is emerging as one of the hottest topics in energy storage fields because of their combination of high power and energy densities. To improve the sluggish faradaic reaction in traditional electrode materials for metal-ion hybrid capacitors, intercalation pseudocapacitive materials have been developed as attractive candidates. However, all the previously reported pseudocapacitances in intercalation/deintercalation reactions are based on cations (Li⁺, Na⁺, Zn²⁺etc.). In this work, we demonstrated the high pseudocapacitance contribution in boron-doped graphite (BG) sheets by taking advantage of anion storage. The BG electrode can reversibly store anions (PF₆ ⁻) through both a surface-controlled pseudocapacitive reaction and a diffusion-limited intercalation/deintercalation reaction. The fabricated Na-ion hybrid capacitor with a BG cathode exhibits superior electrochemical performance. Density functional theory (DFT) calculation reveals that B-doping can significantly reduce the PF₆ ⁻ diffusion energy barrier in the graphite layers.

A dual-redox-additive-enhanced Zn–Br₂ “supercapattery” is demonstrated with battery-level energy density and capacitor-level power density.

TaS₂ nanosheet-based humidity sensors show ultrafast response for multifunctional applications, benefiting from a high surface/volume ratio.

The pseudocapacitive Na ion storage behaviour of WS₂ nanosheets was systematically investigated by various ex/in situ experimental analyses and theoretical calculations.