Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 47, Pages 23716-23724Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta05605e
Keywords
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Funding
- National Natural Science Foundation [21303058]
- Shanghai Municipal Natural Science Foundation [13ZR1412400]
- key project of Shanghai Science and Technology Committee [11JC1403400, 14231200300]
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Nanoporous nitrogen-doped carbon microfibers were facilely synthesized by the pyrolysis of coordination polymer microfibers of aluminium-diethylenetriamine pentaacetic acid (Al-DTPA). Al-DTPA microfibers could be easily produced at a scale of over 0.25 kilograms by a homogeneous precipitation reaction of DTPA and aluminium nitrate in aqueous solution. After undergoing thermal conversion of Al-DTPA at the optimized temperatures and acid-leaching, the well-defined nitrogen-doped carbon microfibers were obtained at a scale of over 10 g in the laboratory. The interconnected nanoporous textures and plentiful nitrogen-doped functional sites endow such microfibers with not only efficient catalytic activity for the oxygen reduction reaction (ORR) in 0.1 M KOH electrolyte, but also superior durability and methanol-tolerance during ORR. Moreover, Al-DTPA microfibers could be also transferred into carbon-based nanoporous solid acids by the sulfuric acid-solvothermal treatment. Plentiful -SO3H functional groups were grafted on the surfaces of nanoporous nitrogen-dopped carbon microfibers (protonic acid amount, 1.8 mmol g(-1)). They served as a highly efficient and recyclable solid acid catalyst for the acetalization of benzaldehyde and ethylene glycol in a yield of about 99.0 at%. The thermal conversion of Al-coordination polymers might be a new practically feasible technique for the preparation of functional nanoporous nitrogen-doped carbon microfibers.
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