双金属片
催化作用
材料科学
热解
氧还原
碳纤维
氧气
金属
兴奋剂
阴极
非金属
化学工程
无机化学
硫黄
氧还原反应
纳米技术
化学
电极
电化学
物理化学
有机化学
冶金
复合材料
工程类
复合数
光电子学
作者
Dexin Liu,Bo Wang,Hongguan Li,Shan Huang,Minmin Liu,Jing Wang,Qingjie Wang,Jiujun Zhang,Yufeng Zhao
出处
期刊:Nano Energy
[Elsevier]
日期:2019-04-01
卷期号:58: 277-283
被引量:207
标识
DOI:10.1016/j.nanoen.2019.01.011
摘要
M-Nx-C (M stands for Fe, Co, Ni) represent a typical type of highly efficient oxygen reduction reaction (ORR) nonprecious-metal catalyst, of which the catalytic activity can be further boosted by introducing other metal or nonmetal species. However the rational design and construction of such system remains conceptually challenging and requires in-depth research both experimentally and theoretically. In this work, highly active sulfur (S)-modified Zn,Co-Nx-C-Sy bimetallic sites confined in dentric carbon are developed through a facile simultaneous coordination pyrolysis method. Such an architecture offers two fold advantages in ORR catalysis: 1) The enhanced binding between O2 and Zn-Co bimetallic site can facilitate the O-O activation and reduce the cleavage barrier of O-O bond in the step of *OOH + e-→*O + OH-; 2) the S doping can engineer the charges around Zn,Co active center, and strengthen the interaction with oxygenated species by decreasing the free energy changes of *O2 + e- + H2O→*OOH + OH- step. As a result, the as prepared Zn,Co-Nx-C-Sy exhibits outstanding electrocatalytic performance with a half wave potential 67 mv more positive than commercial Pt/C (0.893 V vs. 0.826 V), as well as excellent stability ( ~ 4.4% current loss after 20,000 s test). The material also shows promising potential as cathode catalyst in flexible Zn-air batteries.
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