Poly(Vinyl Alcohol)/Poly(Acrylic Acid) Gel Polymer Electrolyte Modified with Multi-Walled Carbon Nanotubes and SiO2 Nanospheres to Increase Rechargeability of Zn-Air Batteries.

IF 5 3区 化学 Q1 POLYMER SCIENCE Gels Pub Date : 2024-09-12 DOI:10.3390/gels10090587
Lucia Díaz-Patiño, Minerva Guerra-Balcázar, Lorena Álvarez-Contreras, Noé Arjona
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Abstract

Zn-air batteries (ZABs) are a promising technology; however, their commercialization is limited by challenges, including those occurring in the electrolyte, and thus, gel polymer electrolytes (GPEs) and hydrogels have emerged as substitutes for traditional aqueous electrolytes. In this work, PVA/PAA membranes were synthesized by the solvent casting method and soaked in 6 M KOH to act as GPEs. The thickness of the membrane was modified (50, 100, and 150 μm), and after determining the best thickness, the membrane was modified with synthesized SiO2 nanospheres and multi-walled carbon nanotubes (CNTs). SEM micrographs revealed that the CNTs displayed lengths of tens of micrometers, having a narrow diameter (95 ± 7 nm). In addition, SEM revealed that the SiO2 nanospheres had homogeneous shapes with sizes of 110 ± 10 nm. Physicochemical experiments revealed that SiO2 incorporation at 5 wt.% increased the water uptake of the PVA/PAA membrane from 465% to 525% and the ionic conductivity to 170 mS cm-1. The further addition of 0.5 wt.% CNTs did not impact the water uptake but it promoted a porous structure, increasing the power density and the stability, showing three-times-higher rechargeability than the ZAB operated with the PVA/PAA GPE.

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用多壁碳纳米管和二氧化硅纳米球改性的聚(乙烯醇)/聚(丙烯酸)凝胶聚合物电解质可提高锌-空气电池的充电能力。
锌-空气电池(ZABs)是一项前景广阔的技术;然而,其商业化受到包括电解质在内的各种挑战的限制,因此凝胶聚合物电解质(GPEs)和水凝胶已成为传统水性电解质的替代品。在这项工作中,采用溶剂浇铸法合成了 PVA/PAA 膜,并将其浸泡在 6 M KOH 中作为 GPE。在确定最佳厚度后,用合成的二氧化硅纳米球和多壁碳纳米管(CNTs)对膜进行改性。扫描电镜显微照片显示,碳纳米管的长度为数十微米,直径较窄(95 ± 7 nm)。此外,扫描电镜显示,二氧化硅纳米球形状均匀,大小为 110 ± 10 纳米。理化实验表明,加入 5 wt.% 的 SiO2 可使 PVA/PAA 膜的吸水率从 465% 提高到 525%,离子导电率提高到 170 mS cm-1。进一步添加 0.5 wt.% 的 CNTs 不会影响吸水率,但却促进了多孔结构的形成,提高了功率密度和稳定性,与使用 PVA/PAA GPE 的 ZAB 相比,充电能力提高了三倍。
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来源期刊
Gels
Gels POLYMER SCIENCE-
CiteScore
4.70
自引率
19.60%
发文量
707
审稿时长
11 weeks
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