Discrete V2O5/NCQDs heterogeneous assemblies synergizing built-in fields and confinement for enhanced aqueous zinc ion storage

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-06-24 DOI:10.1063/5.0278578

Guiling Lu, Tianqi Yong, Yinsong Wang, Yingqiang Yang, Xinyu Li

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引用次数: 0

Abstract

Aqueous zinc-ion batteries show promise for sustainable energy storage but face practical challenges due to sluggish Zn2+ diffusion and irreversible vanadium dissolution in cathode materials. This study proposes an in situ chemical bonding strategy to anchor nitrogen-doped carbon quantum dots (NCQDs) onto V2O5 nanoparticles, forming heterostructured units with built-in electric fields. These units further self-assemble into spherical assemblies (V2O5/NCQDs), which are embedded within a porous graphene aerogel (GA) matrix to construct a V2O5/NCQDs@GA composite cathode with a hierarchical confinement framework. The discrete arrangement of V2O5/NCQDs heterostructured units forms multi-point conductive network and open ion channels, reducing charge transfer resistance and enhancing Zn2+ diffusion. The spatial confinement and concentration gradient effects of GA synergistically suppress vanadium dissolution and mitigate solvent corrosion, enhancing the structural stability of the electrode. Consequently, the V2O5/NCQDs@GA electrode shows excellent rate capability (309 mAh g−1 at 3.0 A g−1) and cycling stability (retaining 268 mAh g−1 after 1000 cycles).

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离散V2O5/NCQDs非均相组件协同内置场和约束增强锌离子水溶液存储

水锌离子电池具有可持续储能的前景，但由于阴极材料中Zn2+扩散缓慢和钒不可逆溶解，面临着实际挑战。本研究提出了一种原位化学键策略，将氮掺杂碳量子点（NCQDs）锚定在V2O5纳米颗粒上，形成具有内置电场的异质结构单元。这些单元进一步自组装成球形组件（V2O5/NCQDs），嵌入多孔石墨烯气凝胶（GA）基质中，构建具有分层约束框架的V2O5/NCQDs@GA复合阴极。V2O5/NCQDs异质结构单元的离散排列形成了多点导电网络和开放的离子通道，降低了电荷传递阻力，增强了Zn2+的扩散。GA的空间约束和浓度梯度效应协同抑制了钒的溶解，减轻了溶剂腐蚀，提高了电极的结构稳定性。因此，V2O5/NCQDs@GA电极表现出优异的倍率性能（在3.0 A g−1时为309 mAh g−1）和循环稳定性（在1000次循环后保持268 mAh g−1）。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.