International Journal of Hydrogen Energy, Vol.45, No.28, 14539-14546, 2020
A highly proton conductive membrane based on hydrolyzed NbCl5 and phytic acid
It is vital to choose economical and environmentally friendly proton conductive materials to improve the performance of proton exchange membranes, which occupies a unique position in proton exchange membrane fuel cells. This paper reports a new proton conductive nanocomposite, that was named NbO2(OH)-PA prepared from phytic acid (PA) and NbCl5. NbO2(OH)-PA showed an excellent proton conductivity of 135 mS cm(-1) at 85 degrees C and 97% relative humidity. In addition, NbO2 (OH)-PA was combined with sulfonated poly (ether ketone) (SPEEK) in different proportions to form proton conductive membranes, that are labeled SPEEK-x NbO2(OH)-PA. SPEEK-0.9% NbO2(OH)-PA exhibited the best proton conductivity of 0.17 S cm(-1) at 80 degrees C in water. This work may provide new ideas for improving proton conductivity of membranes through simple methods. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.