Journal
CHEMICAL ENGINEERING JOURNAL
Volume 395, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.125064
Keywords
Molten salt boiling method; Bimetallic decoration; FeCoNC hollow nanospheres; Oxygen reduction; Zn-air battery; Direct ethanol fuel cell
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Funding
- Natural Science Foundation of Jiangsu Province [BK20170529]
- Jiangsu University [16JDG064]
- China Postdoctoral Science Foundation [2017M611714]
- High-tech Research Key laboratory of Zhenjiang [SS2018002]
- High-Level Innovative and Entrepreneurial Talents Introduction Plan of Jiangsu Province
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Previous studies have shown that introducing of an extra transition metal into the monometallic-nitrogen doped carbon (mono-MNC) could benefit oxygen adsorption, further weaken the O-O bond energy, and thus promote the electrocatalytic performance for oxygen reduction reaction (ORR). Up to now, the bimetallic-nitrogen doped carbons (bi-MNC) were mostly prepared by direct pyrolysis of in-situ mixed precursors or pre-formed bimetal-organic frameworks (bi-MOFs), sub-micro sized products with encapsulated metal particles were commonly formed, leading to lower utilization of the metal atoms and less active sites density of the catalysts. In this paper, surface anchored iron-cobalt-nitrogen doped carbon (FeCoNC) hollow nanospheres were properly designed by boiling the monodispersed polypyrrole nanospheres in Fe, Co ions involved molten salt. Even a trace amount of Fe, Co atoms were anchored on the nitrogen doped carbon hollow nanospheres, the onset potential, half-wave potential and limiting current density could reach to 0.950 V, 0.841 V and 6.898 mA/cm(2) respectively at low mass loading of 0.2 mg/cm(2), demonstrating high utilization of the metal atoms and dense active sites of the catalyst. The Zn-air battery and direct ethanol fuel cell tests also revealed that the FeCoNC hollow nanospheres could present high stability in both non-oxidizing and oxidizing alkaline conditions. The surface decoration of bimetallic atoms on nitrogen doped carbon nanospheres through molten salt boiling method provides an effective way to prepare superior electrocatalysts for ORR.
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