微超级电容器 VN 薄膜电极沉积条件的调整:厚度的影响

IF 3.1 4区 工程技术 Q2 ELECTROCHEMISTRY Journal of The Electrochemical Society Pub Date : 2024-09-10 DOI:10.1149/1945-7111/ad75be
Allan Lebreton, Jérémy Barbé, Christophe Lethien, Jonathan N. Coleman and Thierry Brousse
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引用次数: 0

摘要

氮化钒具有显著的电学和电化学特性,因此在用作双功能薄膜(即电极材料和电流收集器)时,是一种极有前景的微型伪电容器材料。然而,与高速循环相关的具体限制因素仍不清楚。在这项研究中,我们利用电化学阻抗光谱和循环伏安法测量,并结合常用于评估电池电极高倍率行为的半经验模型,评估了氮化钒薄膜充放电相关的特征时间是如何随薄膜厚度的变化而变化的。这两种方法非常吻合,并揭示了这种双功能材料的速率能力受到 VN 导电性的限制。为了证实这一发现,我们在铂集流器上溅射了 VN 薄膜,结果发现集流器/电极材料的充放电特性时间缩短了六倍。这强调了使用集流器的重要性,即使是高导电性电极材料也不例外。
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Tuning Deposition Conditions for VN Thin Films Electrodes for Microsupercapacitors: Influence of the Thickness
Vanadium nitride is a highly promising material for micro-pseudocapacitors when used as a bifunctional thin film, i.e. an electrode material and a current collector, owing to its remarkable electrical and electrochemical properties. However, the specific limitations associated with high-rate cycling remain unclear. In this study, we evaluate how the characteristic time associated with charge/discharge of vanadium nitride films is modified with the film thicknesses using electrochemical impedance spectroscopy and cyclic voltammetry measurements coupled to a semi-empirical model commonly utilized to assess the high-rate behaviour of battery electrodes. Both methodologies are in good agreement and revealed that rate capability of this bi-functional material is limited by the VN electrical conductivity. To confirm this finding, VN thin films were sputtered on platinum current collectors, leading to a six-fold reduction in the characteristic time associated with charge/discharge of the current collectors/electrode material. This underscores the importance of using current collectors even for highly conductive electrode materials.
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来源期刊
CiteScore
7.20
自引率
12.80%
发文量
1369
审稿时长
1.5 months
期刊介绍: The Journal of The Electrochemical Society (JES) is the leader in the field of solid-state and electrochemical science and technology. This peer-reviewed journal publishes an average of 450 pages of 70 articles each month. Articles are posted online, with a monthly paper edition following electronic publication. The ECS membership benefits package includes access to the electronic edition of this journal.
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