Interfacial metal-nitrogen units of NiCo/nitrogen-doped carbon for robust oxygen reduction reaction
| Autor: | Mingkai Zhang, Zhaoming Xia, Yaodong Yang, Yongquan Qu, Jihong Bian, Wangyan Gou, Yuxuan Liu, Qingchen Dong, Jiayuan Li |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Alloy chemistry.chemical_element Nanoparticle 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Alkali metal 01 natural sciences Nitrogen 0104 chemical sciences Corrosion Catalysis Metal chemistry Chemical engineering visual_art visual_art.visual_art_medium engineering General Materials Science Leaching (metallurgy) 0210 nano-technology |
| Zdroj: | Carbon. 155:545-552 |
| ISSN: | 0008-6223 |
| DOI: | 10.1016/j.carbon.2019.09.001 |
| Popis: | Corrosion-induced nitrogen (N) leaching limits the long-term applications of N-doped carbon (NC) catalysts for electrocatalytic oxygen reduction reaction (ORR). Anchored N for NC can suppress their corrosion and thus restrain the loss of catalytically active sites, resulting in the improved ORR durability. Herein, we report our strategies to suppress the leaching of N by embedding the NiCo alloy nanoparticles in NC nanowires and thus creating the interfacial metal-N units (M-N) for the robust ORR durability in alkali over 50 h. Also, the synergistic effects of Ni/Co–N, abundant active sites and favourable kinetics bring the high ORR activity over the Pt/C benchmark. Thus, our strategies with the improved durability and activity could create promising ORR catalysts with ∼5 times of activity-durability factor over the NC catalysts. |
| Databáze: | OpenAIRE |
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