Two‐dimensional V₂CT_x In‐situ Derived Porous V₂O₃@C Flakes Towards Zinc‐Ion Capacitors as a Competitive Cathode Material

Abstract Zinc‐ion capacitors (ZICs) are promising electrochemical devices for energy storage due to their advantages including environmental friendliness, safety, and simple assembly. However, its application is still subject to modest rate and stable performance of the involved cathodes. In this work, we in‐situ fabricate a two‐dimensional flake‐shape framework containing amorphous carbon‐coated V₂O₃ nanowires (V₂O₃@C) by using few‐layered V₂CT_x (f‐V₂CT_x) as the raw material, and further utilize it as an appealing cathode material for ZICs. Thanks to the nanowires‐assembled porous architecture, conductive carbon coating, and rich defects through in‐situ lattice tunnel distortion of corundum‐type V₂O₃, the V₂O₃@C cathode delivers an excellent rate capability of ∼175 mAh g⁻¹ at 8.0 A g⁻¹, and the stable long‐term cycling behavior (∼168.0 mAh g⁻¹ remained after 6500 cycle at 5.0 A g⁻¹s). Furthermore, the V₂O₃@C based ZICs exhibit a specific energy density of ∼36.3 Wh kg⁻¹ and a long‐term cycle life with a capacity retention value of 74.3% after 10,000 cycles at 1.0 A g⁻¹. This highlights that our V₂O₃@C is a competitive cathode candidate for advanced ZICs.