02418nas a2200241   4500008004100000022001400041245010900055210006900164260000900233300001100242490000800253520160500261653002101866653002101887653002601908653001001934653002101944653001601965100002501981700002202006700002102028856012702049       2026                        eng d  a2352-152X00aMolecularly engineered PW12@Polypyrrole/MXene composite for high-energy, high-rate lithium-ion capacitor0 aMolecularly engineered PW12PolypyrroleMXene composite for highen  cFEB   a1201650 v1483 a<p>
	Due to inherent differences in the charge storage mechanisms of anode and cathode in a hybrid lithium-ion capacitor (LIC), a significant kinetic balance exists, necessitating the need to improve the ion/electron transfer capability of anode materials. In this study, we have developed a ternary pseudocapacitive composite comprising redox-active phosphotungstic acid nanoclusters (PW12) anchored to polypyrrole nanofibers (PPy), which are further decorated with Ti3C2Tx MXene (PW12@PPy/Ti3C2Tx) synthesized via an in-situ polymerization strategy. Here, Ti3C2Tx MXene serves as a conductive scaffold for PW12 wrapped PPy nanofibers, promoting efficient electron/ion transport. Simultaneously, the incorporation of PW12-anchored PPy nanofibers effectively mitigates the natural tendency of MXene to restack, thus preserving its layered structure. The PW12@PPy/Ti3C2Tx hybrid composite material delivers a high specific capacity of 767 mAh g-1 at 0.1 A g-1 after 100 cycles and a promising cycling stability of 280 mAh g-1 at 1 A g-1 up to 600 cycles. Moreover, an assembled LIC device using PW12@PPy/Ti3C2Tx as anode with nitrogen-doped sucrose carbon (NSC) as cathode demonstrates the highest energy density of 125 Wh kg-1 and maximum power density of 17,058 W kg-1. The device also maintains good cycling stability of 78.4 % capacity retention after 10,000 cycles at 1 A g-1. These results highlight a promising pathway for designing MXene-based hybrid composites with enhanced lithium storage performance, effectively addressing the kinetic mismatch challenges in LIC anode applications.</p>
10aFull cell device10aLi ion diffusion10aLithium-ion capacitor10aMXene10apolyoxometalates10apolypyrrole1 aPawar, Meenakshi, D.1 aPandey, Priyanshi1 aShelke, Manjusha  uhttps://library.ncl.res.in/content/molecularly-engineered-pw12polypyrrolemxene-composite-high-energy-high-rate-lithium-ion