化工进展 ›› 2022, Vol. 41 ›› Issue (10): 5645-5652.DOI: 10.16085/j.issn.1000-6613.2021-2606

• 资源与环境化工 • 上一篇    下一篇

磺酸修饰的金刚石掺杂磺化聚芳醚砜质子交换膜的制备与性能

王盟(), 刘莉莉, 李娜, 胡朝霞, 陈守文()   

  1. 南京理工大学环境与生物工程学院,江苏 南京 210094
  • 收稿日期:2021-12-22 修回日期:2022-03-02 出版日期:2022-10-20 发布日期:2022-10-21
  • 通讯作者: 陈守文
  • 作者简介:王盟(1996—),男,硕士研究生,研究方向为燃料电池电解质膜。E-mail:1294423465@qq.com

Preparation and properties of sulfonate modification nano-diamonds doped sulfonated poly(aryl ether sulfone) proton exchange membranes

WANG Meng(), LIU Lili, LI Na, HU Zhaoxia, CHEN Shouwen()   

  1. School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
  • Received:2021-12-22 Revised:2022-03-02 Online:2022-10-20 Published:2022-10-21
  • Contact: CHEN Shouwen

摘要:

利用KMnO4、浓H2SO4的氧化性及纳米金刚石边缘缺陷引入含氧官能团,得到氧化金刚石(OND)。OND在强碱条件下与1,4-丁磺酸内酯反应,进行烷基磺酸的接枝,制备带有磺酸烷基链的纳米金刚石(SND)。热重分析、红外光谱结果表明了烷基磺酸基团的成功引入,SND的离子交换容量(IEC)达到1.1mmol/g。SND与磺化聚芳醚砜(SPAES)共混后,通过溶液浇铸法制备了表面均匀平整的SPAES-SND复合膜。SPAES-SND复合膜具有较高的吸水率及较低的溶胀率、更高的氧化稳定性及电导率。其中,SPAES-SND-0.5在80℃时最高吸水率达到了75%,拉伸强度为31.3MPa,断裂伸长率为25.1%,在80℃水中的质子电导率达到166mS/cm,显示了良好的综合性能。SPAES-SND-0.5膜在80℃、100%相对湿度(RH)下燃料电池最大功率密度达到了527mW/cm2,相比于原始的SPAES膜(347mW/cm2)提高了51.9%,其优异的质子电导率和电池功率表现出较好的应用前景。

关键词: 燃料电池, 复合材料, 膜, 磺化聚芳醚砜, 纳米金刚石

Abstract:

Oxygen-containing functional groups were introduced on the surface of nano-diamond (ND) by the oxidation of edge defect carbons with KMnO4 and concentrated H2SO4 to get the oxide diamond (OND). Under strong alkali conditions, ONDs were reacted with 1,4-butylene sulfonate lactone to get the sulfonic acid alkyl nano-diamond (SND). The structure of the SND was confirmed by TGA and FTIR, and the ion exchange capability (IEC) reached to 1.1mmol/g. After blending with SPAES, a series of SPAES-SND composite membranes with uniform surface were prepared by solution casting method. SPAES-SND composite membranes indicated high water absorption, low swelling rate, high oxidation stability and conductivity. SPAES-SND-0.5 displayed the maximum water absorption of 75% at 80℃, 31.3MPa of tensile strength, 25.1% of elongation at break and 166mS/cm of proton conductivity in 80℃ water, suggesting the good comprehensive properties. For the fuel cell performance at 80℃ and 100% RH, the maximum power density of the SPAES-SND-0.5 membrane reached to 527mW/cm2, which was 51.9% higher than that of the pristine SPAES membrane (347mW/cm2). The excellent proton conductivity and battery power output SPAES-SND-0.5 showed its good application prospects.

Key words: fuel cells, composites, membranes, sulfonated poly(aryl ether sulfone), nano-diamonds

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