期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 30, 页码 19379-19385出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b02078
关键词
Fe/N/C; ORR; sulfur; doping; electrocatalyst
资金
- National Natural Science Foundation of China [51402100, 21573066]
The high-temperature pyrolyzed Fe/N/C is one of the tremendous potential nonprecious metal electrocatalysts for oxygen reduction reaction (ORR). Metal-free carbon materials doped with heteroatoms have also demonstrated prominent electrocatalytic performance for ORR The previous work of S-doping Fe/N/C was produced by pyrolyzing melamine and iron thiocyanate, in which S was from iron thiocyanate. Here, for the first time, we realized an in situ S-doping in Fe/N/C (denoted as S-Fe/N/C) electrocatalyst with S doping reaching 4.76 at % by pyrolyzing thiourea as the S source and iron acetate showing high-performance ORR activity in both alkaline and acid solution. The catalyst pyrolyzed at 700 degrees C and the mass ratio 1:0.2 shows the best activity for ORR. The optimal catalyst displays much greater durability and higher tolerance to methanol than Pt/C (20 wt %). Results of electrochemical measurements show that the S-Fe/N/C follows 4e pathway in alkaline and acid conditions.
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