全钒氧化还原液流电池的开路电压与紫外可见光谱法得出的电荷状态的函数关系

IF 3.2 Q2 CHEMISTRY, PHYSICAL Energy advances Pub Date : 2024-09-13 DOI:10.1039/D4YA00360H
Jana Heiß and Maximilian Kohns
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引用次数: 0

摘要

氧化还原液流电池(RFB)的一个独特特征是其开路电压(OCV)与充电状态(SOC)密切相关。本研究对全钒液流电池(AVRFB)的这种关系进行了实验研究,该电池在两个半电池中使用不同氧化态的钒离子作为氧化还原对。与一些利用 OCV 测量值通过内斯特方程推断 SOC 的文献研究不同,我们提出了一种基于紫外可见光谱的 SOC 估算方法,从而实现了完全独立的 SOC 和 OCV 测量值。此外,这种紫外可见光谱法不依赖于单一波长的数据,而是利用整个吸收光谱来获得更可靠的 SOC 值。所获得的 SOC-OCV 数据与文献值相当吻合,并揭示了溶液的热力学非理想性对 OCV 的重要影响,正如 Nernst 方程所描述的那样。
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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Open circuit voltage of an all-vanadium redox flow battery as a function of the state of charge obtained from UV-Vis spectroscopy†

A unique feature of redox flow batteries (RFBs) is that their open circuit voltage (OCV) depends strongly on the state of charge (SOC). In the present work, this relation is investigated experimentally for the all-vanadium RFB (AVRFB), which uses vanadium ions of different oxidation states as redox pairs in both half-cells. In contrast to several literature studies, which use OCV measurements to deduce the SOC via the Nernst equation, we propose a method based on UV-Vis spectroscopy for SOC estimation, thereby enabling completely independent SOC and OCV measurements. Moreover, rather than relying on data at a single wavelength this UV-Vis method uses the entire absorption spectrum to obtain more robust values for the SOC. The obtained SOC-OCV data agree reasonably well with literature values and reveal a significant influence of the thermodynamic non-ideality of the solutions on the OCV as described by the Nernst equation.

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