Bagryantseva Irina, Ponomareva Valentina, Kungurtsev Yuri
Institute of Solid State Chemistry and Mechanochemistry SB RAS, 630090 Novosibirsk, Russia.
Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia.
Membranes (Basel). 2023 Jun 22;13(7):617. doi: 10.3390/membranes13070617.
The study is devoted to one of the important problems of hydrogen energy-the comparative analysis and creation of novel highly conductive and durable medium-temperature proton membranes based on cesium dihydrogen phosphate and fluoropolymers. The proton conductivity, structural characteristics and mechanical properties of (1 - x)CsHPO-x fluoropolymer electrolytes (x-mass fraction, x = 0-0.3) have been investigated and analyzed. UPTFE and PVDF-based polymers (F2M, F42, and SKF26) with high thermal stability and mechanical properties have been chosen as polymer additives. The used fluoropolymers are shown to be chemical inert matrices for CsHPO. According to the XRD data, a monoclinic CsHPO (P2/m) phase was retained in all of the polymer electrolytes studied. Highly conductive and mechanically strong composite membranes with thicknesses of ~50-100 μm were obtained for the soluble fluoropolymers (F2M, F42, and SKF26). The size and shape of CsHPO particles and their distribution have been shown to significantly affect proton conductivity and the mechanical properties of the membranes. The thin-film polymer systems with uniform distributions of salt particles (up to ~300 nm) were produced via the use of different methods. The best results were achieved via the pretreatment of the suspension in a bead mill. The ability of the membranes to resist plastic deformation increases with the growth of the polymer content in comparison with the pure CsHPO, and the values of the mechanical strength characteristics are comparable to the best low-temperature polymer membranes. The proton-conducting membranes (1 - x)CsHPO-x fluoropolymer with the optimal combination of the conductivity and mechanical and hydrophobic properties are promising for use in solid acid fuel cells and other medium-temperature electrochemical devices.
该研究致力于氢能的一个重要问题——基于磷酸二氢铯和含氟聚合物的新型高导电性和耐用性中温质子膜的比较分析与制备。研究并分析了(1 - x)CsHPO - x含氟聚合物电解质（x为质量分数，x = 0 - 0.3）的质子传导率、结构特征和机械性能。选择了具有高热稳定性和机械性能的基于超聚四氟乙烯（UPTFE）和聚偏氟乙烯（PVDF）的聚合物（F2M、F42和SKF26）作为聚合物添加剂。结果表明，所使用的含氟聚合物是CsHPO的化学惰性基质。根据X射线衍射（XRD）数据，在所有研究的聚合物电解质中均保留了单斜晶系的CsHPO（P2/m）相。对于可溶性含氟聚合物（F2M、F42和SKF26），获得了厚度约为50 - 100μm的高导电性和机械强度高的复合膜。已表明CsHPO颗粒的尺寸和形状及其分布对质子传导率和膜的机械性能有显著影响。通过使用不同方法制备了盐颗粒均匀分布（最大约300nm）的薄膜聚合物体系。通过在珠磨机中对悬浮液进行预处理获得了最佳结果。与纯CsHPO相比，膜抵抗塑性变形的能力随着聚合物含量的增加而增强，并且机械强度特性值与最佳低温聚合物膜相当。具有导电性、机械性能和疏水性最佳组合的质子传导膜(1 - x)CsHPO - x含氟聚合物有望用于固体酸燃料电池和其他中温电化学装置。
