材料科学
电催化剂
纳米片
催化作用
纳米颗粒
热解
化学工程
兴奋剂
氧还原反应
碳纳米管
铂金
碳纤维
纳米技术
氧气
电化学
复合数
电极
物理化学
化学
有机化学
复合材料
工程类
光电子学
作者
Jirong Bai,Yang Fu,Pin Zhou,Peng Xu,Lingling Wang,Jianping Zhang,Xiankai Jiang,Quanfa Zhou,Yaoyao Deng
标识
DOI:10.1021/acsami.2c08572
摘要
PGM-free (platinum group metal) electrocatalysts are intensively investigated and used as low-cost catalysts for the oxygen reduction reaction (ORR) in the field of fuel cells, but further studying their performance improvement methods and actual reaction mechanism is still a big a challenge. In this work, a novel eletrocatalyst containing atomically dispersed Mn/Fe single atoms (SAs) and Fe nanoparticles (NPs) on N-doped carbonaceous (nanosheet/nanotube hybrids) is fabricated via a simple pyrolysis method. This high-activity ORR electrocatalyst has higher half-wave potential (E1/2 = 0.91 V) and superior long-term durability in alkaline solutions and outperforms Pt/C catalysts, which can be ascribed to the synergetic interaction between Mn/Fe SAs and Fe-NPs. FeNPs/MnFeSAs-NC-25 has stronger reactant adsorption ability and a lower dissociation energy barrier than FeNPs/FeSAs-NC, which is conducive to breaking the O-O bond and accelerating ORR kinetics. This work presents a method to synthesize carbon-based electrocatalysts with high ORR activity and stability and shows that a variety of active sites encapsulated in N-doped carbonaceous materials can be a class of competitive candidates for PGM-free electrocatalysts.
科研通智能强力驱动
Strongly Powered by AbleSci AI