| 1 | Structure and oxygen-defect regulation of hydrated vanadium oxide for enhanced zinc ion storage via interlayer doping strategy显示文摘Hydrated vanadium oxide(VOH)is a promising cathode candidate for the aqueous zinc-ion batteries(AZIBs),due to the large interlayer spacing and high capacity.However,severe pulverization and structure collapse upon cycling limit its practical application.Herein,preintercalation strategy with higher positive charge of Cr^(3+) is proposed to regulate the structure and oxygen defect of the VOH-O_(d).The VOH-O_(d) with moderated amount of Cr^(3+) incorporation(M-CrVOH-O_(d)),showing a flower-like hierarchical structure assembled with thin nanosheets,can expand the interlayer spacing and increase the oxygen defect,inducing an enhanced high-rate cycling capability.As a result,M-CrVOH-O_(d) delivers a high capacity of 405 mAh·g^(−1)at 0.5 A·g^(−1),high capacity retention of 120%over 3,500 cycles,as well as an extraordinary energy output(297.3 Wh·kg^(−1)at 355.9 W·kg^(−1)).The density functional theory(DFT)calculations can prove the enhanced reaction kinetics with narrower bandgap and lower Zn^(2+) adsorption energy after the Cr-preintercalation.Meanwhile,based on the ex-situ X-ray diffraction(XRD)analysis,synergistic intercalation of the Zn^(2+)/H^(+)into the interlayers of M-CrVOH-O_(d) can bring the high specific capacity.This work could help us understand the enhanced performance of VOH from the point of the chemical reactions. | Bingchen Zhang Xihao Han Wenpei Kang Daofeng Sun | 2023 | Nano Research2023，16，5： | 0 |
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