دورية
Highly active ZIF-8@CNT composite catalysts as cathode materials for anion exchange membrane fuel cellsElectronic supplementary information (ESI) available. See DOI: https://doi.org/10.1039/d3im00081h
| العنوان: | Highly active ZIF-8@CNT composite catalysts as cathode materials for anion exchange membrane fuel cellsElectronic supplementary information (ESI) available. See DOI: https://doi.org/10.1039/d3im00081h |
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| المؤلفون: | Kumar, Rohit, Mooste, Marek, Ahmed, Zubair, Akula, Srinu, Zekker, Ivar, Marandi, Margus, Käärik, Maike, Leis, Jaan, Kikas, Arvo, Treshchalov, Alexey, Otsus, Markus, Aruväli, Jaan, Kisand, Vambola, Tamm, Aile, Tammeveski, Kaido |
| المصدر: | Industrial Chemistry & Materials; 2023, Vol. 1 Issue: 4 p526-541, 16p |
| مستخلص: | Developing non-precious metal-based inexpensive and highly active electrocatalysts for the oxygen reduction reaction (ORR) in alkaline media is important for fuel cell applications. Herein, we report a simple and effective synthesis of transition-metal-doped zeolitic imidazolate framework-8 (ZIF-8) and carbon nanotube (CNT) composite catalysts (ZIF-8@CNT) prepared viahigh-temperature pyrolysis at 900 °C. The catalysts were characterized using different physicochemical techniques and employed as cathode materials in anion exchange membrane fuel cells (AEMFC). The prepared metal-free (ZNT-900), single-metal-doped (Fe-ZNT-900, Co-ZNT-900) and binary-metal-doped (Fe1Co1-ZNT-900, Fe1Co2-ZNT-900) catalysts had a sufficient amount of N-doping with the presence of FeCo moieties in the carbon skeleton of the latter two materials. N2adsorption–desorption isotherms showed that all the prepared catalysts possess a sufficient Brunauer–Emmett–Teller surface area with more micropores present in ZNT-900, while a combined micro–mesoporous structure was obtained for transition-metal-doped catalysts. Binary-metal-doped catalysts showed the highest number of ORR-active sites (pyridinic-N, pyrrolic-N, graphitic-N, M–Nx) and exhibited a half-wave potential (E1/2) of 0.846 and 0.847 V vs.RHE for Fe1Co1-ZNT-900 and Fe1Co2-ZNT-900, respectively, which surpassed that of the commercial Pt/C catalyst (E1/2= 0.834 V). In H2–O2AEMFCs, the Fe1Co2-ZNT-900 catalyst delivered a maximum power density (Pmax) of 0.171 W cm−2and current density at 0.5 V (j0.5) of 0.326 A cm−2, which is very close to that of the Pt/C catalyst (Pmax= 0.215 W cm−2and j0.5= 0.359 A cm−2). The prepared ZIF-8@CNT catalysts showed remarkable electrocatalytic ORR activity in 0.1 M KOH solution and fuel cell performance comparable to that of the benchmark Pt/C catalyst.Keywords: Rotating disk electrode; Anion exchange membrane fuel cell; Zeolitic imidazolate framework; Non-precious metal catalyst; Oxygen reduction reaction. |
| قاعدة البيانات: | Supplemental Index |
Full Text Finder | تدمد: | 27552608 27552500 |
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| DOI: | 10.1039/d3im00081h |