Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 39, Pages 12074-12081Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta12493b
Keywords
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Funding
- National Natural Science Foundation of China [21236003, 21206042, 20925621, 21176083]
- Basic Research Program of Shanghai [13NM1400700, 13NM1400701]
- Fundamental Research Funds for the Central Universities
- Shanghai Leading Academic Discipline Project [B502]
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Three-dimensional (3D) hierarchical porous Co-containing N-doped carbon materials (HP-Co-CNs) have been successfully prepared for the first time by using cyanamide as a nitrogen source and poly(vinyl alcohol) (PVA) hydrogel-based composites as in situ templates. Remarkably, the resulting HP-Co-CNs possess controllable nitrogen content, high surface area, hierarchical interconnected macro-/mesoporous structure, and a certain amount of Co-N-x moieties which could act as active sites in the oxygen reduction reaction (ORR). In studying the application of HP-Co-CNs for the ORR, the HP-Co-CNs showed excellent electrocatalytic performance for a four-electron ORR, and longer-term stability and higher methanol tolerance then the commercial Pt/C electrocatalyst in alkaline medium, highlighting the importance of macropores for diffusion and a sufficient amount of active sites related to high specific surface area for improving the ORR performance.
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