A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, 28 Vavilova St., bld. 1, Moscow 119334, Russia.
A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninsky Av., Moscow 119991, Russia.
Int J Mol Sci. 2024 May 30;25(11):6001. doi: 10.3390/ijms25116001.
High-temperature polymer-electrolyte membrane fuel cells (HT-PEMFCs) are a very important type of fuel cells since they operate at 150-200 °C, making it possible to use hydrogen contaminated with CO. However, the need to improve the stability and other properties of gas-diffusion electrodes still impedes their distribution. Self-supporting anodes based on carbon nanofibers (CNF) are prepared using the electrospinning method from a polyacrylonitrile solution containing zirconium salt, followed by pyrolysis. After the deposition of Pt nanoparticles on the CNF surface, the composite anodes are obtained. A new self-phosphorylating polybenzimidazole of the 6F family is applied to the Pt/CNF surface to improve the triple-phase boundary, gas transport, and proton conductivity of the anode. This polymer coating ensures a continuous interface between the anode and proton-conducting membrane. The polymer is investigated using CO adsorption, TGA, DTA, FTIR, GPC, and gas permeability measurements. The anodes are studied using SEM, HAADF STEM, and CV. The operation of the membrane-electrode assembly in the H/air HT-PEMFC shows that the application of the new PBI of the 6F family with good gas permeability as a coating for the CNF anodes results in an enhancement of HT-PEMFC performance, reaching 500 mW/cm at 1.3 A/cm (at 180 °C), compared with the previously studied PBI-O-PhT-P polymer.
高温聚合物电解质膜燃料电池（HT-PEMFC）是一种非常重要的燃料电池，因为它们在 150-200°C 下运行，这使得使用含有 CO 的氢气成为可能。然而，需要提高气体扩散电极的稳定性和其他性能仍然阻碍了它们的推广。使用静电纺丝法从含有锆盐的聚丙烯腈溶液中制备基于碳纳米纤维（CNF）的自支撑阳极，然后进行热解。在 CNF 表面沉积 Pt 纳米粒子后，得到复合阳极。将一种新型自磷酰化的 6F 家族聚苯并咪唑应用于 Pt/CNF 表面，以改善阳极的三相界面、气体传输和质子导电性。这种聚合物涂层确保了阳极和质子传导膜之间的连续界面。通过 CO 吸附、TGA、DTA、FTIR、GPC 和气体渗透性测量研究了聚合物。使用 SEM、HAADF STEM 和 CV 研究了阳极。在 H/空气 HT-PEMFC 中的膜电极组件的运行表明，将具有良好气体渗透性的新型 6F 家族 PBI 作为 CNF 阳极的涂层应用，可提高 HT-PEMFC 的性能，在 180°C 时达到 500 mW/cm，在 1.3 A/cm 时（与之前研究的 PBI-O-PhT-P 聚合物相比）。
