Hao Chen

High-volumetric-energy thick electrodes are essential for compact energy storage. However, conventional free-standing carbon scaffolds possess solely macroporous channels, thereby restricting electrolyte access to a single side. Such surface-limited infiltration confines reactions to the superficial layer, resulting in sluggish ion kinetics and poor bulk utilization. To overcome this, we designed a dual-pathway ion-supply interface within a wood-derived carbon/NH4V4O10 composite. This architecture establishes ion-enrichment interfaces at both the electrolyte and current collector sides, enabling cooperative NH4+ delivery throughout the electrode bulk. The dual-path supply drastically reduces the ion-diffusion barrier, boosting active-material utilization by 415% at 17.6 mg cm-2 and effectively eliminating “dead volume”. The optimized electrode achieves a volumetric capacitance of 37.1 F cm-3 at 1 mA cm-3. Kinetics analyses demonstrate an enhanced solid-state NH4+ diffusion coefficient (10-9–10-7 cm2 s-1), and Dunn analysis reveals a bulk-diffusion-dominated storage mechanism (84.7% contribution at 1 mV s-1). An assembled ammonium-ion hybrid capacitor delivers 7.2 mWh cm-3 at 17.8 mW cm-3, while a quasi-solid-state device reliably powers commercial electronics. This work redefines ion-transport pathways in thick electrodes and provides a design blueprint for high-loading, high-energy-density storage systems.

Low-cost graphite anodes from agricultural waste via one-step graphitization in K ₂ CO ₃ –Na ₂ CO ₃ molten salt remove SiO2, achieving a higher Li-ion capacity than commercial graphite (293 vs. 287.8 mA h g ⁻¹ ).

MXene is a cationic 2D material made of transition metal carbides known for its diverse structure and multifunctionality. It faces challenges like stacking, oxidation, and weak mechanical properties that limit its use. By integrating MXene with self‐supporting porous materials, it can be stabilized and converted from fragile 2D sheets to strong 3D structures. Wood, due to its natural structure and stability, is ideal for depositing MXene, which adheres to wood via adsorption, hydrogen bonding, or reactions with wood fibers. New MXene‐wood composites with improved functions have been created and show great potential for interdisciplinary research. This review covers preparation methods, applications, potential development, and challenges of MXene‐wood composites, aiming to provide a research framework and progressive direction for their future development.