Hierarchical N-doped CNTs grafted onto MOF-derived porous carbon nanomaterials for efficient oxygen reduction
| Autor: | Anrui Dong, Qi Huang, Yue Hu, Shaoming Huang, Jinjie Qian, Qipeng Li, Yuanyuan Guo |
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| Rok vydání: | 2022 |
| Předmět: |
Materials science
Nanoparticle Carbon nanotube Electrocatalyst Nanomaterial-based catalyst Surfaces Coatings and Films Electronic Optical and Magnetic Materials Nanomaterials law.invention Biomaterials Colloid and Surface Chemistry Chemical engineering law Calcination Metal-organic framework Pyrolysis |
| Zdroj: | Journal of Colloid and Interface Science. 606:1833-1841 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2021.08.180 |
| Popis: | The rational design and preparation of nonprecious metal-based oxygen reduction reaction (ORR) catalysts to facilitate electron and mass transport are of great significance in oxygen-involved energy applications. Herein, a stepwise approach to synthesize a type of hierarchically porous N-doped carbon nanotubes (CNTs) grafted onto zinc-based coordination polymer derived carbon nanomaterials (M−NCNT, M = Fe/Co/Ni) is proposed. At first, an isostructural zinc-based metal–organic framework (MOF) to HKUST-1(Cu) (ZnHKUST-1) is solvothermally prepared, and then under pyrolysis to obtain MOF-derived porous carbon. After the secondary calcination, the in-situ formed N-doped CNTs are efficiently catalyzed by iron group metal-based nanoparticles (Fe/Co/Ni), which are thermally reduced by porous carbon together with additional urea. The synergistic effect between ultrahigh porosity, large surface area, suitable N-doping, high graphitization degree, and ultrafine metal particles prompts M−NCNT series to exhibit satisfactory electrocatalysis in oxygen reduction. Among them, Fe-NCNT owns the optimal ORR activity with high positive onset potential (0.987 V), half-wave potential (0.860 V) and large diffusion-limited current density (4.893 mA cm−2). Meanwhile, it shows a high current retention of 90.7% after the 24-hour stability, and the obtained Zn-air battery by Fe-NCNT with open-circuit voltage of 1.44 V owns moderate capacity and satisfying stability. The demonstrated method to prepare hierarchically porous N-doped carbon nanomaterials stemmed from MOF precursors unfolds a new route for the facile construction of efficient nanocatalysts for advanced energy applications. |
| Databáze: | OpenAIRE |
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