Saka, Cafer2024-12-242024-12-2420210360-31991879-3487https://doi.org/10.1016/j.ijhydene.2021.03.220https://hdl.handle.net/20.500.12604/6566In this study, nitrogen (N) doped metal-free catalysts were obtained as a result of nitric acid (HNO3) activation of carbon sample (C-KOH-N), which was obtained based on Chlorella Vulgaris microalgae by KOH activation (C-KOH). These catalysts have been effectively used to produce hydrogen (H-2) from the sodium borohydride (NaBH4) methanolysis reaction. Compared to the C-KOH catalyst, the catalytic activity for C-KOH-N showed a seven-fold improvement. Hydrogen generation rate (HGR) values obtained for the NaBH4 methanolysis reaction for C-KOH and C-KOH-N metal-free catalysts were 3250 and 20,100 mL min(-1) g(-1). The catalysts were characterized using various analytical techniques such as XPS, XRD, SEM, FTIR, BET, and elemental analysis. This work can provide a new alternative strategy to produce specific heteroatom-doped metal-free carbon catalysts for environmentally friendly conversion to produce H-2 efficiently. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.eninfo:eu-repo/semantics/closedAccessMetal-freeNitrogenMicroalgaeCatalystHydrogenMethanolysisArticle46402096120971Q2WOS:000659298700015Q12-s2.0-8510464716610.1016/j.ijhydene.2021.03.220