Synthesis, characterization and optimization of sulfonated poly-ether-ether-ketone (sPEEK)/functionalized carbon nanotubes (c-CNTs) nanocomposite membranes for fuel cell application

IF 1.2 4区化学 Q4 CHEMISTRY, ANALYTICAL

Chinese Journal of Analytical Chemistry Pub Date : 2024-02-01 DOI:10.1016/j.cjac.2024.100365

Mawlood Maajal Ali , Ali Basem , Ameer Azam , S.J.A. Rizvi , Farhan Lafta Rashid

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Abstract

Poly-ether ketone (PEEK) was modified to sulfonated poly-ether ketone (sPEEK) by sulfonation process with a degree of sulfonation 49.5%. Carbon nanotubes were acid-treated with sulfuric acid and nitric acid solution (3:1, v/v) for functionalization. sPEEK and sPEEK/c-CNT membranes were prepared by solvent casting method using dimethyl sulfoxide (DMSO) as solvent. The experimental part was conducted as per design of experiment employing response surface methodology consisting three factors, namely (A) c-CNT (wt.%), (B) mixing temperature (°C), and (C) sPEEK concentration (mg/mL). The ion exchange capacity was found to increase with c-CNT (wt.%). Fourier-transform infrared spectroscopy confirms the sulfonation of PEEK. X-Ray diffraction investigates the influence of the sulfonation in the crystal structure of the sPEEK and sPEEK/c-CNT. Scanning electron microscopy images show that c-CNTs are dispersed well in the sPEEK matrix. The results showed slightly increasing water uptake and swelling ratio of the composites membranes. The analysis of variance (ANOVA) revealed that c-CNT (wt.%) is highly affecting the responses. Proton conductivity of sPEEK specimen is about 23.9 mS/cm, which is significantly increased to 57.0 mS/cm for sPEEK/0.12 c-CNT (wt.%) membrane suggesting its application for fuel cell.

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用于燃料电池的磺化聚醚醚酮（sPEEK）/功能化碳纳米管（c-CNTs）纳米复合膜的合成、表征与优化

通过磺化工艺将聚醚醚酮（PEEK）改性为磺化聚醚醚酮（sPEEK），磺化度为 49.5%。用硫酸和硝酸溶液（3:1, v/v）对碳纳米管进行酸处理，以实现功能化。以二甲亚砜（DMSO）为溶剂，通过溶剂浇铸法制备 sPEEK 和 sPEEK/c-CNT 膜。实验部分按照响应面方法进行实验设计，包括三个因素，即 (A) c-CNT（重量百分比）、(B) 混合温度（°C）和 (C) sPEEK 浓度（毫克/毫升）。结果发现，离子交换容量随 c-CNT（重量百分比）的增加而增加。傅立叶变换红外光谱证实了 PEEK 的磺化作用。X 射线衍射研究了磺化对 sPEEK 和 sPEEK/c-CNT 晶体结构的影响。扫描电子显微镜图像显示 c-CNT 在 sPEEK 基体中分散良好。结果表明，复合膜的吸水率和膨胀率略有增加。方差分析（ANOVA）显示，c-CNT（重量百分比）对反应的影响很大。sPEEK 试样的质子传导率约为 23.9 mS/cm，而 sPEEK/0.12 c-CNT（重量百分比）膜的质子传导率则显著增加到 57.0 mS/cm，这表明它可用于燃料电池。

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来源期刊

Chinese Journal of Analytical Chemistry 化学-分析化学

CiteScore

3.60

自引率

25.00%

发文量

17223

审稿时长

35 days

期刊介绍： Chinese Journal of Analytical Chemistry(CJAC) is an academic journal of analytical chemistry established in 1972 and sponsored by the Chinese Chemical Society and Changchun Institute of Applied Chemistry, Chinese Academy of Sciences. Its objectives are to report the original scientific research achievements and review the recent development of analytical chemistry in all areas. The journal sets up 5 columns including Research Papers, Research Notes, Experimental Technique and Instrument, Review and Progress and Summary Accounts. The journal published monthly in Chinese language. A detailed abstract, keywords and the titles of figures and tables are provided in English, except column of Summary Accounts. Prof. Wang Erkang, an outstanding analytical chemist, academician of Chinese Academy of Sciences & Third World Academy of Sciences, holds the post of the Editor-in-chief.