Bottom-up synthesis of MOF-derived hollow N-doped carbon materials for enhanced ORR performance
| Autor: | Jinjie Qian, Ting-Ting Li, Leqiong Xu, Xian Wang, Lulu Chai, Linjie Zhang, Yue Hu, Cheng Han, Shaoming Huang |
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| Rok vydání: | 2019 |
| Předmět: |
Tafel equation
Materials science Coordination polymer Doped carbon chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis Amorphous solid Metal chemistry.chemical_compound Chemical engineering chemistry visual_art visual_art.visual_art_medium General Materials Science 0210 nano-technology Selectivity Carbon |
| Zdroj: | Carbon. 146:248-256 |
| ISSN: | 0008-6223 |
| DOI: | 10.1016/j.carbon.2019.02.006 |
| Popis: | The search on low-cost, ultra-stable, and high-performance non-novel metal replacements to the Pt-based catalysts for oxygen reduction reaction (ORR) is of great urgency. Herein, a bottom-up method has been proposed to synthesize unique hollow N-doped carbon spheres (HNCSs) from an initial amorphous coordination polymer (CP) template-assisted route for the first time. HNCSs exhibit competitively comparable high electrocatalytic ORR activity, excellent reaction selectivity, and stronger long-term stability and negligible methanol crossover effect compared to the commercial Pt/C under the alkaline medium. Together with the other two reported carbonaceous ORR catalysts, including SCSs and NGPCs, our HNCSs possess the lowest Tafel slope of 65.7 mV dec−1 which is close to Pt/C (62.6 mV dec−1), and show much enhanced ORR activity (JL = 5.34 mA cm−2) and stability (Retention = 96.5%, Time = 10 h). This CP-templated route for hollow carbon materials will shed light on a new synthetic strategy to prepare high-performance carbon-based and/or metal-free ORR catalysts. |
| Databáze: | OpenAIRE |
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