Tailoring the nano heterointerface of hematite/magnetite on hierarchical nitrogen-doped carbon nanocages for superb oxygen reduction
| العنوان: | Tailoring the nano heterointerface of hematite/magnetite on hierarchical nitrogen-doped carbon nanocages for superb oxygen reduction |
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| المؤلفون: | Yufei Jiang, Lijun Yang, Zheng Hu, Qingsong Wu, Xiao Du, Renchao Che, Ou Zhuo, Xiali Zhang, Kun Mao, Xizhang Wang, Hao Fan, Qiang Wu, Tao Sun, Jin Zhao, Meng Liu |
| المصدر: | Journal of Materials Chemistry A. 6:21313-21319 |
| بيانات النشر: | Royal Society of Chemistry (RSC), 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Materials science, Renewable Energy, Sustainability and the Environment, Limiting current, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrocatalyst, 01 natural sciences, 0104 chemical sciences, Nanocages, Chemical engineering, Nanocrystal, Carbothermic reaction, Scanning transmission electron microscopy, Nano, Reversible hydrogen electrode, General Materials Science, 0210 nano-technology |
| الوصف: | Nowadays the main challenge for large-scale applications of fuel cells is the designing of cheap and stable electrocatalysts for the oxygen reduction reaction (ORR). Herein, we report a convenient approach to a highly active cheap ORR electrocatalyst by tailoring the nano heterointerface of α-Fe2O3/Fe3O4 on hierarchical nitrogen-doped carbon nanocages (hNCNC) via the partial carbothermal reduction of α-Fe2O3 nanocrystals to Fe3O4. The so-constructed heterostructural α-Fe2O3/Fe3O4/hNCNC electrocatalyst exhibits excellent ORR performance surpassing commercial Pt/C, with a high onset potential (1.03 V vs. reversible hydrogen electrode) and half-wave potential (0.838 V), large limiting current density (6.02 mA cm−2 at 0.5 V), and robust durability and methanol tolerance. The heterostructure is identified by high-angle annular dark field scanning transmission electron microscopy coupled with electron energy-loss spectroscopy. Acid leaching experiments and theoretical calculations indicate that the heterostructural α-Fe2O3/Fe3O4 species with variable Fe valences are responsible for the high ORR performance. In principle, regulating the nano heterointerface based on the multivalent metal species in a nanocrystal matrix could become a new convenient approach to developing high-performance electrocatalysts or even various functional materials. |
| تدمد: | 2050-7496 2050-7488 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::f080a7a99310b27be4465799f3a3ba8bTest https://doi.org/10.1039/c8ta06442cTest |
| حقوق: | CLOSED |
| رقم الانضمام: | edsair.doi...........f080a7a99310b27be4465799f3a3ba8b |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20507496 20507488 |
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