Novel polybenzimidazole/graphitic carbon nitride nanosheets composite membrane for the application of acid-alkaline amphoteric water electrolysis

• 作者: Bo Lv Hang Yin Zhigang Shao Zoujie Luan Ziyi Huang Shucheng Sun Yue Teng Chunhui Miu Qiang Gao
• 来源期刊: 能源化学
• 年，卷（期）: 2022,（1）
• 页码范围: 607-614
• 页数: 8页
• 语种: 英文

摘要

It is a great challenge to develop membrane materials with high performance and long durability for acid-alkaline amphoteric water electrolysis.Hence,the graphitic carbon nitride (g-C3N4) nanosheets were compounded with the (2,2'-m-phenylene)-5,5'-benzimidazole (m-PBI) matrix for the preparation of m-PBI/g-C3N4 composite membranes.The synthesis of g-C3N4 nanosheets and m-PBI matrix have been confirmed by X-ray diffraction (XRD),scanning electron microscopy (SEM),transmission electron micro-scoy (TEM) and 1H nuclear magnetic resonance spectra (1H NMR),respectively.The fourier transform infrared spectroscopy (FT-IR) and SEM of the composite membranes showed the g-C3N4 nanosheets were well dispersed in the m-PBI/g-C3N4 composite membrane.The mechanical properties test exhibited the good mechanical strength,and the TGA curves of m-PBI showed the high thermal stability of composite membranes.Besides,the m-PBI/g-C3N4 composite membrane showed excellent proton and hydroxide ion conductivity,which was higher than pure m-PBI and Nation 115 membrane.The acid-alkaline ampho-teric water electrolysis test showed m-PBI/1％ g-C3N4 composite membrane has the best performance with a current density of 800 mA cm-2 at cell voltage of 1.98 V at 20 ℃.It showed that m-PBI/g-C3N4 composite membrane has a good application prospect for acid-alkaline amphoteric water electrolysis.