NiCo alloy nanoparticles encapsulated in N-doped 3D porous carbon as efficient electrocatalysts for oxygen reduction reaction
| Autor: | Dan Wang, Shunda Jiang, Shaohua Luo, Yahui Zhang, Yanguo Liu, Kangze Dong, Zhiyuan Wang, Qingyu Wang, Ting-Feng Yi, Qing Wang |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Alloy Doping Energy Engineering and Power Technology Nanoparticle 02 engineering and technology Conductivity engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Corrosion Fuel Technology Chemical engineering Mass transfer engineering 0210 nano-technology Dissolution Pyrolysis |
| Zdroj: | International Journal of Hydrogen Energy. 45:22797-22807 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2020.06.138 |
| Popis: | A series of N-doped three dimensional porous carbons loaded with NiCo alloy nanoparticles (NiCo@NpCs) have been successfully fabricated by a template-assisted in-situ pyrolysis strategy and the ORR activities of different-concentration alloy supported N-doped carbons are systematically investigated. The optimized sample exhibits a positive half-wave potential of 0.78 V (vs. RHE), a high diffusion-limited current density (5.120 mA cm−2), and a high durability over 92%, which is superior to the Pt/C. The excellent activity and stability are mainly due to synergistic effect between carbon matrix and NiCo alloy. The N-doped porous carbon support with high surface area and good conductivity not only provides more active sites but also promotes electron transport and mass transfer process. Furthermore, the unique core-shelled structure NiCo@NpCs can effectively avoid the dissolution and corrosion of alloy particles and the surface peeling of particles during the catalyze reaction, which is beneficial to improving the activity and stability. |
| Databáze: | OpenAIRE |
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