Sulfonic-Group-Grafted Ti3C2Tx MXene: A Silver Bullet to Settle the Instability of Polyaniline toward High-Performance Zn-Ion Batteries

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Polyaniline (PANI) is a promising cathode materials for Zn-ion batteries (ZIBs) as a consequence of its intrinsic conductivity and redox exercise; nonetheless, the achievements of PANI in high-performance ZIBs are largely hindered by its instability throughout the repeated cost/discharge. Benefiting from the excessive conductivity, flexibility, and grafting means collectively, a surface-engineered TithreeC2Tx MXene is designed as a silver bullet to battle in opposition to the deprotonation and swelling/shrinking points occurring within the redox technique of PANI, that are the origins of its instability. Particularly, the sulfonic-group-grafted TithreeC2Tx(S-TithreeC2Tx) constantly offers protons to enhance the protonation diploma of PANI and maintains the polymer spine at a domestically low pH, which successfully inhibits deprotonation and brings excessive redox exercise together with good reversibility. In the meantime, the conductive and versatile natures of S-TithreeC2Tx help the quick redox response of PANI and concurrently buffer its corresponding swelling/shrinking. Due to this fact, the S-TithreeC2Tx-enhanced PANI cathode concurrently achieves a excessive discharge capability of 262 mAh g–1 at zero.5 A g–1, a superior price functionality of 160 mAh g–1 at 15 A g–1, and a great cyclability over 5000 cycles with 100% coulombic effectivity. This work enlightens the event of versatile MXene through floor engineering for superior batteries.


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