As the platinum (Pt) loading in proton exchange membrane fuel cell cathodes is driven down to reduce costs, catalyst utilization becomes increasingly important. Here, we report an atomic layer deposition-facilitated electrode fabrication technique designed to improve the catalyst-ionomer interface. The ionomer solvent environment and carbon support nanoporosity are studied independently, and it is found that the combination of an agglomerated ionomer dispersion and a mesoporous support gives access to a high catalytic activity (mass activity [MA] = 0.31 A/mg_Pt with pure Pt) that can be maintained at high current densities. We hypothesize that the formulation results in Pt sufficiently withdrawn from the ionomer such that poisoning and transport losses are reduced. When paired with a low-resistance dispersion-cast membrane, a 0.1-mg_Pt/cm² cathode can deliver a 0.65-V power density of 1.0 W/cm² at 150 kPa and 80°C. The assembly also demonstrates impressive durability, losing only 33 mV after 30,000 cycles.

随着降低质子交换膜燃料电池阴极中铂（Pt）的含量以降低成本，催化剂的利用变得越来越重要。在这里，我们报告了一种旨在改善催化剂-离聚物界面的原子层沉积促进电极制造技术。分别研究了离聚物溶剂环境和碳载体纳米多孔性，发现团聚的离聚物分散体和中孔载体的组合可提供高催化活性（质量活性[MA] = 0.31 A / mg _Pt具有纯的Pt），可以保持高电流密度。我们假设该制剂导致Pt从离聚物中充分排出，从而减少了中毒和运输损失。与低电阻分散流延膜搭配使用时，在150 kPa和80°C下，0.1 mg _Pt / cm ²阴极可提供1.0 W / cm ²的0.65-V功率密度。该组件还显示出令人印象深刻的耐用性，在30,000次循环后仅损失33 mV。