A Trifunctional Hydroxylated Borophene-Mediated MXene Enabled Super-Stable and Fast-Kinetics Interface Storage
ADVANCED FUNCTIONAL MATERIALS(2024)
Abstract
The high electronic conductivity and tailorable structural properties of MXene materials make them promising candidates for energy storage. However, their poor chemical instability and self-stacking effect greatly limit their application, especially in aqueous systems. Here, using a eutectic etching approach, hydroxylated borophene is used as a trifunctional mediator to construct robust Ti3C2Tx-based MXene/B self-assembled film electrodes for zinc-ion capacitors (ZICs). Due to this mediator, the as-formed strong interfacial binding within the heterostructure can give rise to an integrated modification effect and promote high-efficiency interface energy storage. One is to strengthen the thermodynamic stability of local Ti & horbar;O bonds and inhibit the irreversible degradation of MXene; two is to enlarge the interface space of the MXene electrode and boost the ion transport; three is to improve the interfacial Zn2+ trapping ability without affecting Zn2+ migration on the MXene surface. Thus, the MXene/B electrode exhibits a high areal capacitance (537.9 mF cm-2) at a current density of 0.2 mA cm-2 and an extraordinary cycling stability at 1 mA cm-2, with 99.64% retention after 40 000 cycles, which far surpasses that of most previous reports. This work provides a pathway for overcoming the interface storage limit of MXene electrodes to construct high-performance ZICs. This report highlights the design concept of trifunctional hydroxylated borophene mediated self-assembled heterostructure electrode for zinc ion capacitors, to unlock an efficient interface storage with an unexpectedly 40000-cycle lifespan. Benefited from a multiscale interfacial synergistic effect, an integrated regulation of the self-stacking effect, ion capture capability and thermodynamic stability of Ti & horbar;O bond of the MXene electrode can be achieved. image
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Key words
hydroxylated borophene,interface storage,multiscale synergistic effect,trifunctional mediator,zinc-ion capacitors
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