Fe, N, S-codoped carbon frameworks derived from nanocrystal superlattices towards enhanced oxygen reduction activity
| Autor: | Baixu Zhu, Angang Dong, Biwei Wang, Jinxiang Zou, Yuchi Yang, Han Wenqian |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
lcsh:Biotechnology Heteroatom Single atom chemistry.chemical_element 02 engineering and technology 010402 general chemistry lcsh:Chemical technology 01 natural sciences lcsh:Technology Oxygen reduction reaction lcsh:TP248.13-248.65 General Materials Science lcsh:TP1-1185 lcsh:Science Heteroatom doping Tafel equation lcsh:T Research Doping General Engineering Self-assembly 021001 nanoscience & nanotechnology Sulfur Nitrogen lcsh:QC1-999 0104 chemical sciences Nanocrystals chemistry Nanocrystal Chemical engineering lcsh:Q 0210 nano-technology Carbon lcsh:Physics |
| Zdroj: | Nano Convergence, Vol 6, Iss 1, Pp 1-10 (2019) Nano Convergence |
| ISSN: | 2196-5404 |
| Popis: | Recently, iron, nitrogen and sulfur codoped carbon-based materials have gained increasing attention for their synergistic effect towards superior electrocatalytic oxygen reduction performance. To gain insight into the contributions of the heteroatoms, we developed a facile and reproducible method for constructing Fe, N, S-codoped carbon frameworks derived from self-assembled Fe3O4 nanocrystal superlattices. The material constructed by the suggested method exhibited excellent ORR activity with more positive half-wave potential (∼ 0.869 V, vs RHE), higher diffusion-limiting current density (∼ 5.88 mA/cm2) and smaller Tafel slope (45 mV/dec) compared with Fe, N-codoped carbon frameworks and Pt/C. Notably, Fe3O4 nanocrystals served as both the building blocks for constructing carbon frameworks and the source of Fe residues leaving in the frameworks at the same time. By artificially tailoring the doping type and level as well as the homogeneousness of heteroatoms, the results discussed herein prove the importance of each kind of heteroatom in boosting ORR activity. Electronic supplementary material The online version of this article (10.1186/s40580-019-0174-5) contains supplementary material, which is available to authorized users. |
| Databáze: | OpenAIRE |
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