Fe-N-C catalysts for oxygen electroreduction under external magnetic fields:Reduction of magnetic O_(2) to nonmagnetic H_(2)O  

作　　者：Wojciech Kicinski Jakub P.Sek Agata Kowalczyk Sylwia Turczyniak-Surdacka Anna M.Nowicka Slawomir Dyjak Boguslaw Budner Mikolaj Donten 

机构地区：[1]Institute of Chemistry,Military University of Technology,2 Kaliskiego Str.PL 00-908 Warsaw,Poland [2]Faculty of Chemistry,University of Warsaw,Pasteura 1 Str,PL 02-093 Warsaw,Poland [3]Faculty of Chemistry,Biological and Chemical Research Centre,University of Warsaw,Zwirki i Wigury 101 Str,PL 02-089 Warsaw,Poland [4]Institute of Optoelectronics,Military University of Technology.2 Kaliskiego Str,PL 00-908 Warsaw,Poland

出　　处：《Journal of Energy Chemistry》2022年第1期296-308,I0008,共14页能源化学（英文版）

基　　金：supported by the National Science Centre,Poland,UMO-2016/23/B/ST5/00127。

摘　　要：An extensive analysis of iron-nitrogen-carbon(Fe-N-C)electrocatalysts synthesis and activity is presented concerning synthesis conditions such as initial Fe content,pyrolysis temperature and atmosphere(inert N_(2),reducing NH_(3),oxidizing Cl_(2) and their sequential combinations)and the influence of an external magnetic field on their performance in oxygen reduction reaction(ORR).Thermosetting porous polymers doped with FeCl_(3) were utilized as the Fe-N-C catalysts precursors.The pyrolysis temperature was varied within a 700-900℃range.The temperature and atmosphere of pyrolysis strongly affect the porosity and compositi on of the resultant Fe-N-C catalysts,while the in itial amount of Fe precursor shows much weaker impact.Pyrolysis under NH_(3) yields materials similar to those pyrolyzed under an inert atmosphere(N_(2)).In contrast,pyrolysis under Cl_(2) yields carbon of peculiar character with highly disordered structure and extensive microporosity.The application of a static external magnetic field strongly enhances the ORR process(herein studied in an alkaline environment)and the enhancement correlates with the Fe content in the Fe-N-C catalysts.The Fe-N-C materials containing ferromagnetic iron phase embedded in N-doped microporous carbon constitute attractive catalysts for magnetic field-aided anion exchange membrane fuel cell technology.

关 键 词：Oxygen reduction reaction Fe-N-C catalyst PGM-free catalyst Magnetic field CHRONOAMPEROMETRY Anion exchange membrane fuel cell (AEMFC) 

分 类 号：O64[理学—物理化学]