Department of Advanced Interdisciplinary Studies, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8904, Japan.
Advanced Technologies Development Center, Eco Solutions Company, Panasonic Corporation, 1048 Kadoma, Kadoma, Osaka, 571-8686, Japan.
Angew Chem Int Ed Engl. 2016 Oct 10;55(42):13184-13188. doi: 10.1002/anie.201607741.
Reducing the use of platinum (Pt) on polymer electrolyte fuel cell anodes is critical for the widespread dissemination of these energy conversion systems. Although Pt usage can be minimized by the even dispersion of isolated Pt atoms, no atomically dispersed Pt catalysts that promote hydrogen oxidation at a rate required for practical fuel cells have been reported to date. Covalent triazine frameworks with atomically dispersed Pt atoms (0.29 wt %) are described and it is demonstrated that the material has a high electrocatalytic hydrogen oxidation activity without an overpotential. Importantly, when the loading amount was increased to 2.8 wt %, the electrocatalytic hydrogen oxidation activity of the resulting electrode was comparable to that of commercial carbon supported 20 wt % Pt catalysts, and the catalytic activity for oxygen reduction was markedly reduced. Thus, Pt-modified covalent triazine frameworks selectively catalyze hydrogen oxidation, even in the presence of dissolved oxygen, which is critical for limiting cathode degradation during the start-stop cycles of fuel cells.
减少聚合物电解质燃料电池阳极上的铂 (Pt) 使用对于这些能量转换系统的广泛传播至关重要。虽然通过孤立 Pt 原子的均匀分散可以最小化 Pt 的使用，但迄今为止尚未报道具有促进实际燃料电池所需速率的氢氧化的原子分散 Pt 催化剂。本文描述了具有原子分散 Pt 原子 (0.29wt%) 的共价三嗪框架，并证明该材料具有高电催化氢氧化活性而没有过电势。重要的是，当负载量增加到 2.8wt%时，所得电极的电催化氢氧化活性可与商业碳负载 20wt%Pt 催化剂相媲美，并且对氧还原的催化活性明显降低。因此，Pt 修饰的共价三嗪框架即使在溶解氧存在下也能选择性地催化氢氧化，这对于限制燃料电池的启动-停止循环期间阴极降解至关重要。
