Journal
ACS APPLIED NANO MATERIALS
Volume 3, Issue 1, Pages 742-751Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.9b02260
Keywords
nonprecious metal electrocatalysts; hierarchical porous carbon; ZnO hard template; carbothermal reduction; electrochemical stability
Funding
- National Natural Science Foundation of China [21802069, 21676135]
- National Scientific Instrument Development Major Project of the National Natural Science Foundation of China [51627810]
- National Key R&D Program of China [2016YFB0101308]
- Fundamental Research Funds for the Central Universities of Ministry of Education of China
- China Postdoctoral Science Foundation [2018M642213]
- Liaoning of China [U1508202]
- Natural Science Foundation of Jiangsu Province [BK20161273]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- 333 High-Level Talents Cultivation Program of Jiangsu Province [BRA2018007]
- Six Talent Peaks Program of Jiangsu Province
- Scientific Research Foundation of Graduate School of Nanjing University [2017ZDL05]
- NJU National Demonstration Base for Innovation & Entrepreneurship [SCJDO20901]
- National Natural Science Foundation [U1508202]
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Nonprecious metal electrocatalysts (NPMEs) have been recognized as highly promising oxygen electroreduction catalysts, but improving their activity and stability in acidic electrolyte remains critical. Here, we integrated self-assembly technology induced by rotary evaporation with the hard-template method to synthesize Fe-N-codoped NPMEs with large specific surface areas and hierarchical pore structure. The presence of Fe3+ assisted complete removal of the ZnO hard template at a relatively low temperature, which is beneficial for both the in situ growth of micropores/mesopores within the carbon layers and the retention of more nitrogen-containing groups. The obtained Fe-N-C/ZnO porous carbon material exhibited outstanding oxygen reduction reaction catalytic activity, along with respectable electrochemical stability in a perchloric acid electrolyte. Applied in fuel cells, the electrocatalyst loading was reduced to 2.0 mg/cm(2) because of increased mass transfer arising from the hierarchical porous structure and resulting in a power density of 700 mW/cm(2).
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