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In the synthesis, change from alkaline to acidic conditions is critical for the formation of monodisperse mesostructured polymer nanospheres. Owing to unique structure of triazine stabilized in the covalent polymeric networks during the pyrolysis process, the derived mesoporous carbon nanospheres possess an ultrahigh nitrogen content (up to 15.6 wt%) even after pyrolysis at 800\u00a0\u00b0C, which is the highest nitrogen content among mesoporous carbon nanospheres. Furthermore, these monodisperse mesoporous carbon nanospheres possess a high surface area (\u2248883 m<jats:sup>2<\/jats:sup> g<jats:sup>\u22121<\/jats:sup>) and large pore size (\u22488.1\u00a0nm). As an anode for sodium\u2010ion batteries, the ultrahigh nitrogen\u2010containing mesoporous carbon nanospheres exhibit superior rate capability (117 mAh g<jats:sup>\u22121<\/jats:sup> at a high current density of 3 A g<jats:sup>\u22121<\/jats:sup>) and high reversible capacity (373 mAh g<jats:sup>\u22121<\/jats:sup> at 0.06 A g<jats:sup>\u22121<\/jats:sup>), indicating a promising material for energy storage.<\/jats:p>","DOI":"10.1002\/smtd.202001137","type":"journal-article","created":{"date-parts":[[2021,2,8]],"date-time":"2021-02-08T03:25:49Z","timestamp":1612754749000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":127,"title":["Monodisperse Ultrahigh Nitrogen\u2010Containing Mesoporous Carbon Nanospheres from Melamine\u2010Formaldehyde Resin"],"prefix":"10.1002","volume":"5","author":[{"given":"Dingyi","family":"Guo","sequence":"first","affiliation":[{"name":"Laboratory of Advanced Materials Department of Chemistry Shanghai Key Lab of Molecular Catalysis and Innovative Materials iChEM and State Key Laboratory of Molecular Engineering of Polymers Fudan University  Shanghai 200433 P. 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