Plasma-Induced Oxygen-Rich Vanadium Hexacyanoferrate Embedded in Hierarchical Porous Carbon Framework for Superior Aqueous Manganese-Ion Storage
Ke Mao, Jundong Shao, Ying Huang*, Wei Tu, Junke Li, Sheng Yang, Faxing Wang, Yao Gao, Panpan Zhang*, Xing Lu*
Adv. Funct. Mater. 2025
https://doi.org/10.1002/adfm.202517468
Abstract
As a new energy storage device, manganese-ion hybrid supercapacitor (Mn2+ HSC) shows great potential due to the characteristics combined with high theoretical capacity, great safety, low cost and environmental friendliness. However, it remains a great challenge to develop electrode materials with fast manganese-ion storage kinetics. Herein, a plasma-induced oxygen-rich vanadium hexacyanoferrate (VHCF) embedded in hierarchical porous carbon framework (HPCF) (denoted as VHCF/HPCF-O) is reported, which serves as an outstanding manganese-ion storage material for Mn2+ HSCs. The VHCF/HPCF-O composite shows high electrical conductivity, enhanced hydrophilicity, multiple active sites and electrochemical stability, resulting in a remarkable specific capacitance of 240 F g−1 with a low polarization of 142 mV at 5 mV s−1 and excellent cycling stability (102.1% after 10 000 cycles). Both experimental results and theoretical calculations verify that two redox-active sites of V = O and Fe-C≡N contribute to the high capacitance and the high-rate storage benefiting from the interconnected conductive network. By pairing the VHCF/HPCF-O cathode with the Ti3C2Tx anode, the assembled Mn2+ HSC delivers a remarkable energy density of 23.3 Wh kg−1 at 180 W kg−1, superior to most recently reported HSCs. This work highlights the material design for manganese-ion storage and its great potential for novel energy storage devices.
