Tuning the Performance of Nanofiller Reinforced Phosphorylated Chitosan-Based Proton Exchange Membrane
writer：Saad Ahmed,1,z Zhengyuan Tao, Hao Zhang, Naveed Ahmed, Haroon Gulzar, Jianli Wang
keywords：chitosan, multiwalled carbon nanotubes,
source：期刊
specific source：Journal of The Electrochemical Society
Issue time：2023年
本研究采用ATMP一步法磷酸化殼聚糖(CS)，然后利用氨基功能化多壁碳納米管(MWCNTs-NH2)制備PCS/N-MWCNTs膜。采用傅里葉變換紅外(FTIR)、x射線衍射(XRD)、能量色散x射線能譜(EDX)、掃描電鏡(SEM)和透射電鏡(TEM)對CS和后來的PCS/N-MWCNTs納米復(fù)合膜的磷酸化進(jìn)行了表征。還對它們的機(jī)械性能、吸水率、面積膨脹比、離子交換容量(IEC)和質(zhì)子電導(dǎo)率進(jìn)行了評估。MWCNTs的-NH2基團(tuán)與-膦酸以及PCS的-NH2基團(tuán)之間的界面相互作用為質(zhì)子轉(zhuǎn)移提供了額外的位點(diǎn)，從而提高了PCS/N-MWCNTs膜的質(zhì)子導(dǎo)電性。這些結(jié)果表明，在PCS鏈中加入N-MWCNTs降低了PCS鏈的遷移率，最終改善了復(fù)合膜的熱性能和力學(xué)性能。在80℃時，N-MWCNTs含量為5 wt.%的復(fù)合膜的質(zhì)子電導(dǎo)率為0.045 S.cm?1。因此，PCS/N-MWCNTs納米復(fù)合膜作為PEM可用于燃料電池。利用這一優(yōu)勢，N-MWCNTs填充氫燃料電池優(yōu)于PCS填充膜。
In this study, a one-step method was enforced for the phosphorylation of chitosan (CS) using ATMP, and later amino functionalized multiwalled carbon nanotubes (MWCNTs-NH2) were used for the fabrication of PCS/N-MWCNTs membranes. The phosphorylation of CS and later PCS/N-MWCNTs nanocomposite membranes were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). They were also evaluated for their mechanical properties, water uptake, area swelling ratio, ion-exchange capacity (IEC), and proton conductivity. Interfacial interaction among an -NH2 group of MWCNTs and -phosphonic acid as well as the -NH2 group of PCS provided extra sites for proton transfer, thus improving the proton conductivity of PCS/N-MWCNTs membranes. These results revealed that the incorporation of N-MWCNTs into PCS chains lowers PCS chain mobility and ultimately improved the thermal and mechanical properties of the composite membranes. The proton conductivity of the composite membrane with 5 wt.% of N-MWCNTs at 80 °C was 0.045 S.cm?1 . Thus, PCS/N-MWCNTs nanocomposite membranes as a PEM can be used in fuel cells. With this advantage, the N-MWCNTs-fifilled hydrogen fuel cell outperforms compared to PCS fifilled membrane.
圖1.磷酸化殼聚糖的反應(yīng)方案。
國家自然科學(xué)基金(22178317、22109138)資助;中國博士后科學(xué)基金(2020M671790)和高等教育委員會;巴基斯坦(編號527/IPFP-II(Batch-I)/ SRGP/NAHE/HEC/2020/275)。