Introducing Ce ions and oxygen vacancies into VO2 nanostructures with high specific surface area for efficient aqueous Zn-ion storage

ChemPhysMater Pub Date : 2025-01-01 DOI:10.1016/j.chphma.2024.05.004

Mingying Bao , Zhengchunyu Zhang , Xuguang An , Baojuan Xi , Shenglin Xiong

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Abstract

Positive electrodes play a decisive role in exploring the Zn²⁺ storage mechanism and improving the electrochemical performance of aqueous Zn-ion batteries (AZIBs). Feasible design and preparation of cathode materials have been crucial for AZIBs in recent years. Herein, taking the advantage of the tunnel structure of VO₂, which can withstand volume change during charging/discharging, VO₂ doped with Ce ions is synthesized by a simple one-step hydrothermal method and oxygen vacancies are synchronously generated during synthesis. It delivers a capacity of 158.5 mAh g⁻¹ at the current density of 5 A g⁻¹ after 1000 cycles and exhibits an excellent energy density of 312.8 Wh kg⁻¹ at the power density of 142 W kg⁻¹. The structural modification and prospect of enhancing its conductivity by doping with rare-earth metals and introducing oxygen vacancies may aid in improving the stability of AZIBs in the future.

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在具有高比表面积的 VO2 纳米结构中引入 Ce 离子和 O2 缺陷，实现 Zn 离子的高效水溶液储存

正极对于探索Zn2+的储存机理和提高水性锌离子电池（AZIBs）的电化学性能起着决定性作用。可行的阴极材料设计和制备是近年来azib的关键。本文利用VO2的隧道结构可以承受充放电过程中体积的变化，通过简单的一步水热法合成了掺杂Ce离子的VO2，并且在合成过程中同步产生了氧空位。在5a g−1电流密度下，经过1000次循环后，其容量可达158.5 mAh g−1；在142w kg−1功率密度下，其能量密度可达312.8 Wh kg−1。通过掺杂稀土金属和引入氧空位对azib的结构进行修饰和提高其导电性的前景可能有助于提高azib的稳定性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ChemPhysMater

CiteScore

3.90

自引率

0.00%

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