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

This report demonstrated the first study on the use of a new 2D nanomaterial (Mxene) for enhancing membrane performance of intermediate temperature (>100 °C) 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 3 wt% Ti3C2Tx-MXene showed the proton conductivity more than 2 times higher than that of pristine PBI membrane at the temperature range of 100 °C–170 °C, and led to substantial increase in maximum power density of fuel cells by ∼30% tested at 150 °C. The addition of Ti3C2Tx-MXene also improved the mechanical properties and thermal stability of PBI membranes. At 3 wt% Ti3C2Tx-MXene, the elongation at break of phosphoric acid doped PBI remained unaffected at 150 °C, 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.