5 years ago

Polybenzimidazole/Mxene composite membranes for intermediate temperature polymer electrolyte membrane fuel cells.

Chenxi Xu, Jigui Cheng, Ruizhi Lin, Mingming Fei, Renji Bian, Hongxi Xian, Yuming Deng, Dongyu Cai, Xiaole Zhang
This report demonstrated the first study on the use of a new 2D nanomaterial (Mxene) for enhancing membrane performance of intermediate temperature (>100 oC) polymer electrolyte membrane fuel cells (ITPEMFCs). In this study, a typical Ti3C2Tx-MXene was synthesized and incorporated into polybenzimidazole (PBI)-based membranes by using a solution blending method. The composite membrane with 3wt.% Ti3C2Tx-MXene showed the proton conductivity more than 2 times higher than that of pristine PBI membrane at the temperature range of 100-170 ºC, and led to substantial increase in maximum power density of fuel cells by ~ 30% tested at 150 oC. The addition of Ti3C2Tx-MXene also improved the mechanical properties and thermal stability of PBI membranes. At 3wt.% Ti3C2Tx-MXene, the elongation at break of phosphoric acid doped PBI remained unaffected at 150 ºC, and the tensile strength and Young's modulus was increased by ~150% and ~160%, respectively. This study pointed out promising application of MXene in ITPEMFCs.

Publisher URL: http://doi.org/10.1088/1361-6528/aa9ab0

DOI: 10.1088/1361-6528/aa9ab0

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