制备环保型生物聚合物电解质--K-卡拉胶与六水硝酸锌盐,以应用于电化学装置

IF 2.4 4区 化学 Q3 CHEMISTRY, PHYSICAL
Ionics Pub Date : 2024-09-09 DOI:10.1007/s11581-024-05786-w
K. Yoghananthan, P. N. Palanisamy, S. Selvasekarapandian, S. Kamatchi Devi
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引用次数: 0

摘要

利用溶液浇铸法,将卡拉胶和不同浓度的六水硝酸锌结合在一起,开发出了一种锌离子传导生物聚合物电解质膜。为了检测样品的无定形性质,使用了 X 射线衍射(XRD)研究。在 1 g K-carrageenan 与 1.1 M. wt % 的六水硝酸锌生物聚合物膜中观察到了最大的无定形性质。傅立叶变换红外光谱(FTIR)研究表明,K-卡拉胶与六水硝酸锌发生了络合反应。通过扫描电镜分析研究了纯 K-卡拉胶、1 克 K-卡拉胶与 1.1 M.wt % 的六水硝酸锌和 1 克 K-卡拉胶与 1.2 M.wt % 的六水硝酸锌的表面形态。纯 K-卡拉胶膜(SEM)表面均匀,具有均匀的小孔。含有 1.1 M.wt % 六水硝酸锌的 1 克 K- 卡拉胶膜(扫描电镜)呈现矩形棒状,孔隙直径适中。1 g K-carrageenan 与 1.2 M.wt % 的六水硝酸锌膜(扫描电镜)显示出矩形杆状性质,以及中等直径的孔隙和聚集体。对于掺锌的生物聚合物膜样品,采用差示扫描量热法(DSC)测定玻璃化转变温度。纯 K 卡拉胶的 Tg 值为 37.04 °C。当盐浓度增加到 0.9 M.wt % 时,Tg 值升高。当盐浓度进一步增加到 1.1 M.wt % 时,Tg 值下降。最高锌离子导电膜的 Tg 值为 75.95 °C。电化学阻抗光谱(EIS)显示,1 克 K-卡拉胶与 1.1 M. wt % 的六水硝酸锌膜的锌离子导电率最高,为 2.9 × 10-3 S cm-1。根据线性扫描伏安法(LSV)的研究,含有 1.1 M. wt % 六水硝酸锌膜的 1 g K-carrageenan 显示出 2.75 V 的宽电化学稳定性窗口。循环伏安法研究了导电性最高的生物聚合物膜(Zn2+ 离子)的循环稳定性。构建原生锌电池时使用的电解液是 1 克 K-卡拉胶和 1.1 M. wt % 的六水硝酸锌,后者具有最高的锌离子传导性。该内置电池的 OCV(开路电压)为 1.43 V。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Preparation of eco-friendly biopolymer electrolyte, K-carrageenan with zinc nitrate hexahydrate salt, for application in electrochemical devices

Preparation of eco-friendly biopolymer electrolyte, K-carrageenan with zinc nitrate hexahydrate salt, for application in electrochemical devices

K-carrageenan and various concentrations of zinc nitrate hexahydrate have been combined to develop a zinc ion-conducting biopolymer electrolyte membrane using the solution casting method. To examine the amorphous nature of the samples, X-ray diffraction (XRD) study has been used. The maximum amorphous nature is observed for 1 g K-carrageenan with 1.1 M. wt % of zinc nitrate hexahydrate biopolymer membrane. Fourier transform infrared spectroscopy (FTIR) investigations have shown that the complexation occurs between the K-carrageenan with zinc nitrate hexahydrate. Surface morphology of Pure K-carrageenan, 1 g K-carrageenan with 1.1 M.wt % of zinc nitrate hexahydrate and 1 g K-carrageenan with 1.2 M.wt % of zinc nitrate hexahydrate have been studied by SEM analysis. Pure K-carrageenan membrane (SEM) has uniform surface with uniform small pores. 1 g K-carrageenan with 1.1 M.wt % of zinc nitrate hexahydrate membrane (SEM) shows rectangular rod-shaped nature along with pores of moderate diameter. 1 g K-carrageenan with 1.2 M.wt % of zinc nitrate hexahydrate membrane SEM shows rectangular rod-shaped nature along with pores of moderate diameter and aggregates. For the zinc-doped biopolymer membrane samples, the differential scanning calorimetry (DSC) is used to determine the glass transition temperature. Pure K-carrageenan has got Tg value at 37.04 °C. When the salt concentration is increased upto 0.9 M.wt % of the Tg value increases. When the salt concentration is further increased upto 1.1 M.wt % of the Tg value decreases. Highest zinc ion conducting membrane has got a Tg value of 75.95 °C. According to electrochemical impedance spectroscopy (EIS), the 1 g K-carrageenan with 1.1 M. wt % of zinc nitrate hexahydrate membrane has highest zinc ion conductivity of 2.9 × 10−3 S cm−1. According to the linear sweep voltammetry (LSV) investigation, the 1 g K-carrageenan with 1.1 M. wt % of zinc nitrate hexahydrate membrane has shown a wide electrochemical stability window of 2.75 V. The Evans polarization method determined that Zn2+ ion has a transference number of 0.42. The cyclic stability of highest conducting biopolymer membrane (Zn2+ ion) is studied by Cyclic Voltammetry. The electrolyte used in the construction of the primary zinc battery is 1 g K-carrageenan with 1.1 M. wt % of zinc nitrate hexahydrate having highest zinc ion conductivity. For this built-in battery, the OCV (Open Circuit Voltage) is found to be 1.43 V.

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来源期刊
Ionics
Ionics 化学-电化学
CiteScore
5.30
自引率
7.10%
发文量
427
审稿时长
2.2 months
期刊介绍: Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.
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