An easy procedure to build up membrane-electrode assemblies for applications dedicated to miniaturized PEMFC using H2 or CH3OH by a two-steps atmospheric plasma process is reported. Firstly, catalyst nanoparticles are grafted on carbon substrates by spraying a Pt colloidal solution in the post-discharge of an RF atmospheric plasma torch. In the second step, the resulting decorated electrodes are covered by plasma synthesized polymeric membranes in the discharge of a DBD. The sulfonated polystyrene membranes are synthesized by injecting simultaneously styrene and trifluoromethanesulfonic acid monomers, in the presence of a carrier gas (Ar or He). The membranes are chemically characterized by XPS, ToF-SIMS, and FTIR (IRRAS) and their deposition rate is investigated by SEM.
Air supply control for proton exchange membrane fuel cells without explicit modeling
Université de Lorraine（洛林大学）；Research Center for Automatic Control of Nancy (CRAN), UMR CNRS 7039, Université de Lorraine（南西自动控制中心（CRAN））；Laboratoire Jacques-Louis Lions (LJLL), UMR CNRS 7598, Sorbonne Université（雅克-路易·利翁斯实验室（LJLL））
Doped graphene/carbon black hybrid catalyst giving enhanced oxygen reduction reaction activity with high resistance to corrosion in proton exchange membrane fuel cells
碳的氮掺杂是通过铂-氮和碳-氮键改善质子交换膜燃料电池催化剂性能和耐久性的重要方法。该研究表明，连接铂和石墨烯/炭黑（石墨烯/炭黑的比例= 2/3）杂化载体材料的对苯基和石墨N作用桥实现了铂纳米颗粒的平均尺寸为（4.88 +/-1.79）nm。在0.60 V时，它使低温氢燃料电池的性能提高到0.934 W cm-2，是商用Pt/C的1.55倍。掺杂还增强了Pt与载体材料之间的相互作用和抗腐蚀性，从而提高了低温氢燃料电池的耐久性，在30k循环的原位加速应力降解试验中，Pt/C的催化剂降解衰减为92 mV，在0.80 A cm-2处的衰减为10 mV，远低于能源部的目标（<30 mV）。同时，Pt/NrEGO2-CB3在1.5A cm-2的碳腐蚀原位加速应力试验中，经过5k次循环后，仍保持初始功率密度的78%，比商业Pt/C的功率密度稳定，加速应力试验后仅保持54%。
Manganese oxide nano flakes onto simultaneously activated defective CNTs for the creation of CNTs-graphene supported oxygen reduction composite catalysts applied in air fuel cell
非贵金属氧化物与经济炭材料的合理组合是创造高性能空气电极材料的关键。在稀H $_2$ SO $_4$中，通过取消常规水热处理或添加表面活性剂模板剂，将商品化的碳纳米管（CNTs）与MnO $_4^-$反应，制备了CNTs负载的锰氧化物复合催化剂（CMnCs）。然后将CMnC组装成装备在金属空气燃料电池中的商用空气阴极。碳纳米管表现出结构上的缺陷。在合成过程中，外部CNT壁破裂成石墨烯纳米片，但仍保持部分附着于内部碳管。石墨烯平面的这种暴露表现出额外的氧还原反应性。在碳纳米管表面均匀生长了纳米级的氧化锰薄片（γ-MnOOH）。其沉积密度与KMnO $_4$对CNTs的添加量密切相关。在相同条件下，单独的CMnCs的ORR活性超过了原料CNT和合格的市场催化剂，并且在当前的生产工艺下，CMnCs添加的空气燃料电池能够在100 mA/cm $^2$下输出约15%以上的功率。
