Redox flow batteries using cerium salts and anthraquinone-2,7-disulfonic acid as new redox couple dissolved in mixture solution of methanesulfonic and perchloric acids,International Journal of Energy Research

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Redox flow batteries using cerium salts and anthraquinone-2,7-disulfonic acid as new redox couple dissolved in mixture solution of methanesulfonic and perchloric acids
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2022-08-05 , DOI: 10.1002/er.8465
Agnesia Permatasari ₁ , Wonmi Lee ₁ , Yongchai Kwon _{1,

2,

3}

Affiliation

Aqueous redox flow batteries (ARFBs) using acidic supporting electrolytes are one of promising future batteries because the acidic supporting electrolytes can increase the solubility of active materials and their ionic conductivity, followed by energy density and efficiencies of ARFBs using these. Nevertheless, discovering proper redox couple with a high open circuit voltage (OCV) in acidic media is still challengeable because a low OCV is a main drawback of the conventional redox couples dissolved in acidic media. To increase OCV without sacrificing the solubility of active materials, a new redox couple consisting of cerium salts and anthraquinone-2,7-disulfonic acid (AQDS) that are dispersed in methanesulfonic acid (MSA) is suggested. With cerium salts and AQDS dissolved in acidic MSA, a high OCV of 1.45 V is achieved, while MSA affects the increases in solubility and stability of cerium salts. To further increase the solubility of AQDS and facilitate its redox reactivity, the mixture of MSA and perchloric acid (HClO₄) is used as supporting electrolyte. Based on that, the solubility of AQDS is improved from 0.35 to 0.5 M, while ARFB using 1 M cerium ions and 0.5 M AQDS dissolved in the mixture solution of 4 M MSA and 1 M HClO₄, shows excellent performances such as discharge capacity of 20.3 Ah L⁻¹, energy efficiency of 86.5%, and capacity retention of ~99% over 100 cycles.

中文翻译：

氧化还原液流电池使用铈盐和蒽醌-2,7-二磺酸作为新的氧化还原对溶解在甲磺酸和高氯酸的混合溶液中

使用酸性支持电解质的水系氧化还原液流电池（ARFBs）是有前途的未来电池之一，因为酸性支持电解质可以增加活性材料的溶解度及其离子电导率，然后是使用这些电解质的 ARFBs 的能量密度和效率。然而，在酸性介质中发现具有高开路电压 (OCV) 的合适氧化还原电对仍然具有挑战性，因为低 OCV 是溶解在酸性介质中的传统氧化还原电对的主要缺点。为了在不牺牲活性材料溶解度的情况下提高 OCV，提出了一种由分散在甲磺酸 (MSA) 中的铈盐和蒽醌-2,7-二磺酸 (AQDS) 组成的新型氧化还原电对。将铈盐和 AQDS 溶解在酸性 MSA 中，可实现 1.45 V 的高 OCV，而 MSA 影响铈盐溶解度和稳定性的增加。为了进一步增加 AQDS 的溶解度并促进其氧化还原反应，MSA 和高氯酸 (HClO₄）用作支持电解质。在此基础上，AQDS 的溶解度从 0.35 提高到 0.5 M，而 ARFB 使用 1 M 铈离子和 0.5 M AQDS 溶解在 4 M MSA 和 1 M HClO ₄的混合溶液中，表现出优异的性能，例如放电容量20.3 Ah L ^-1，能量效率为 86.5%，100 次循环后容量保持率约为 99%。

更新日期：2022-08-05

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