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首页> 外文期刊>Advanced Sustainable Systems >Development of In Situ Formed Metal Pyrophosphates (MP2O7, Where M = Sn, Ti, and Zr)/PA/PBI Based Composite Membranes for Fuel Cells
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Development of In Situ Formed Metal Pyrophosphates (MP2O7, Where M = Sn, Ti, and Zr)/PA/PBI Based Composite Membranes for Fuel Cells

机译：原位成型金属焦磷酸盐（MP2O7，其中M = Sn、Ti和Zr）/PA/PBI基燃料电池复合膜的开发

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Abstract Development of high temperature polymer electrolyte membrane fuel cells (HT‐PEMFCs) at elevated temperatures is important for the enhancement of tolerance toward CO impurities and for the development of non‐precious metal catalysts. The key challenge in such HT‐PEMFCs is the high temperature polymer electrolyte membranes. Herein, the development of in situ formed metal pyrophosphates (MP2O7, where M = Sn, Ti, and Zr) in phosphoric acid doped polybenzimidazole (PA/PBI) composite membranes for HT‐PEMFCs is reported. The formation mechanism of MP2O7, and characteristics of MP2O7/PA/PBI composite membranes are studied in detail. In contrast to the rapid decay in performance of pristine PA/PBI membrane cells, the in situ formed MP2O7/PA/PBI composite membranes show significantly higher proton conductivity, improved performance, and stability at elevated temperatures of 200–250 °C. The best results are obtained on the in situ formed SnP2O7/PA/PBI composite membrane cells, exhibiting a high peak power density of 476 mW cm−2 and proton conductivity of 51.3 mS cm−1 at 250 °C. The excellent durability of SnP2O7/PA/PBI composite membrane is due to the uniform distribution of in situ formed SnP2O7 nanoparticles in PBI membranes and the formation of a gel‐like region, thin and irregular amorphous layer on the SnP2O7 with the high acid retention ability. This effectively alleviates the PA leaching at elevated temperatures of the new HT‐PEMFCs.
机译：摘要高温聚合物的发展电解质膜燃料电池(HT必经质子交换膜燃料电池)升高的温度是很重要的增强对杂质和宽容发展的非贵金属催化剂。高温聚合物电解质膜。形成金属焦磷酸(M = Sn MP2O7,在磷酸钛,锆掺杂聚苯并咪唑(PBI / PA)复合膜HT必经质子交换膜燃料电池的报道。MP2O7机理和特点MP2O7 / PA / PBI复合膜进行了研究细节。性能的原始PA / PBI膜细胞,原位形成MP2O7 / PA / PBI复合质子膜显示更高导电率、改进的性能和稳定性在升高的温度下的200 - 250°C。结果得到原位形成的SnP2O7 / PA / PBI复合膜细胞,表现出较高的峰值功率密度476 mW厘米−2和51.3厘米−1女士的质子导电率250°C。复合膜是由于制服原位形成SnP2O7的分布纳米粒子在PBI膜和形成的凝胶类地区,薄和不规则非晶层的SnP2O7高酸保留能力。的爸爸在更高的温度下浸出

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