电催化剂
催化作用
材料科学
热解
无机化学
甲醇
电化学
杂原子
硫脲
三聚氰胺
硫氰酸盐
钴
硫黄
兴奋剂
碳纤维
化学
有机化学
电极
冶金
物理化学
复合材料
复合数
光电子学
戒指(化学)
作者
Kui Hu,Tao Li,Dongdong Liu,Jia Huo,Shuangyin Wang
标识
DOI:10.1021/acsami.6b02078
摘要
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 °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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