State Key Laboratory of Organic-Inorganic Composites and ‡Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China.
ACS Appl Mater Interfaces. 2017 Sep 27;9(38):32859-32867. doi: 10.1021/acsami.7b11371. Epub 2017 Sep 18.
The severe dependence of oxygen reduction reaction (ORR) in fuel cells on platinum (Pt)-based catalysts greatly limits the process of their commercialization. Therefore, developing cost-reasonable non-precious-metal catalysts to replace Pt-based catalysts for ORR is an urgent task. Here, we use the composite of inexpensive polyaniline and superfine polytetrafluoroethylene powder as precursor to synthesize a metal-free N,F-codoped porous carbon catalyst (N,F-Carbon). Results indicate that the N,F-Carbon catalyst obtained at the optimized temperature 1000 °C exhibits almost the same onset (0.97 V vs RHE) and half-wave potential (0.84 V vs RHE) and better durability and higher crossover resistance in alkaline medium compared to commercial 20% Pt/C, which is attributed to the good dispersion of fluorine and nitrogen atoms in the carbon matrix, high specific surface area, and the synergistic effects of fluorine and nitrogen on the polarization of adjacent carbon atoms. This work provides a new strategy for in situ synthesis of N,F-codoped porous carbon as highly efficient metal-free electrocatalyst for ORR in fuel cells.
燃料电池中氧还原反应（ORR）对铂（Pt）基催化剂的严重依赖极大地限制了其商业化进程。因此，开发经济合理的非贵金属催化剂来替代 Pt 基催化剂用于 ORR 是一项紧迫的任务。在这里，我们使用廉价的聚苯胺和超细聚四氟乙烯粉末的复合材料作为前体制备了一种无金属的 N，F 共掺杂多孔碳催化剂（N，F- Carbon）。结果表明，在优化温度 1000°C 下获得的 N，F-Carbon 催化剂在碱性介质中具有几乎相同的起始电位（相对于 RHE 为 0.97 V）和半波电位（相对于 RHE 为 0.84 V），并且具有更好的耐久性和更高的交叉电阻，优于商业 20%Pt/C，这归因于氟和氮原子在碳基质中的良好分散、高比表面积以及氟和氮对相邻碳原子极化的协同作用。这项工作为在燃料电池中作为高效无金属电催化剂原位合成 N，F 共掺杂多孔碳提供了一种新策略。
