Lei Guo, Yongbiao Huang, Ida Ritacco, Renhui Zhang, Jun Chang, Mohammad K. Al-Sadoon, Peng Chen and Amir Mahmoud Makin Adam
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引用次数: 0
Abstract
Aqueous Al–air batteries (AABs) are considered promising electrochemical energy devices due to their high-energy density, high-capacity density, and stable discharge voltage. However, the self-corrosion, passivation, and parasitic hydrogen precipitation side reactions in the aqueous electrolyte degrade the performance of these batteries, limiting their development. To overcome the problems related to the use of AABs, we introduce ethylenediaminetetraacetic acid disodium salt (EDTA-2Na) as an additive to the alkaline electrolyte. EDTA-2Na adsorbs strongly to the Al anode interface creating a protective layer capable of inhibiting water-induced parasitic reactions. In fact, in the presence of the additive, the hydrogen evolution tests have shown that the hydrogen evolution rate decreased from 0.70 to 0.30 mL cm−2 min−1. In addition, the electrochemical tests indicated an inhibition efficiency of 55%, the full-cell discharge tests suggested an increase in the specific capacity density of the battery from 943.6 to 2381.7 mA h g−1 and the anode utilization increased from 31.6% to 80.9%, greatly improving the performance of the battery. Surface characterization of the Al alloy surface was also carried out to investigate the adsorption of EDTA-2Na on it. This electrolyte modification strategy provides a promising option for modulating the anode/electrolyte interface chemistry to achieve high-performance AAB.
水性铝-空气电池(AAB)因其高能量密度、高容量密度和稳定的放电电压而被认为是前景广阔的电化学能源设备。然而,水溶液电解质中的自腐蚀、钝化和寄生析氢副反应降低了这些电池的性能,限制了它们的发展。为了克服与使用 AAB 有关的问题,我们引入了乙二胺四乙酸二钠盐(EDTA-2Na)作为碱性电解液的添加剂。EDTA-2Na 会强烈吸附在铝阳极界面上,形成一个保护层,能够抑制水引起的寄生反应。事实上,在添加剂的作用下,氢演化测试表明氢演化率从 0.70 mL cm-2 min-1 降至 0.30 mL cm-2 min-1。此外,电化学测试表明抑制效率为 55%,全电池放电测试表明电池的比容量密度从 943.6 mA h g-1 提高到 2381.7 mA h g-1,阳极利用率从 31.6% 提高到 80.9%,大大提高了电池的性能。此外,还对铝合金表面进行了表征,以研究 EDTA-2Na 在其上的吸附情况。这种电解质改性策略为调节阳极/电解质界面化学性质以实现高性能 AAB 电池提供了一种很有前景的选择。
期刊介绍:
An international, peer-reviewed journal covering all of the chemical sciences, including multidisciplinary and emerging areas. RSC Advances is a gold open access journal allowing researchers free access to research articles, and offering an affordable open access publishing option for authors around the world.