催化作用
大孔隙
纳米颗粒
材料科学
化学工程
碳化
乙二胺四乙酸
热解
金属
三聚氰胺
氧气
氧还原
电极
电化学
化学
无机化学
螯合作用
纳米技术
介孔材料
有机化学
复合材料
冶金
物理化学
工程类
扫描电子显微镜
作者
Naiguang Wang,Jianwen Liang,Jingjing Liu,Qiong Cai,Jingsha Li,Jinpeng Chen,Tao Huang,Zhongqi Shi
标识
DOI:10.1016/j.jpowsour.2021.230707
摘要
Constructing the M-N-C (M = Fe, Co, etc.) with meso- and macroporous structures is an effective strategy for designing the high-performance catalysts towards oxygen reduction reaction (ORR). However, these structures can hardly be achieved via the pyrolysis of classic metal-organic frameworks. Herein, we prepare the CoFe nanoparticles with surface oxides dispersed in Co/Fe-N-C support via carbonizing melamine and ethylenediaminetetraacetic acid chelated with metal ions. This hybrid exhibits high proportions of meso- and macropores along with excellent ORR catalytic activity, as evidenced by the half-wave potentials of 0.91 and 0.61 V (vs. RHE) in 0.1 M KOH and 3.5 wt% NaCl, respectively. The Al/Mg-air batteries with this catalyst exhibit superior performance to those employing Pt/C, primarily derived from the enlarged pore diameters and the exposed ORR active sites substantially enhancing the air-electrode performance. Our study provides an avenue to broaden the pore sizes of M-N-C for boosting its ORR catalytic activity.
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