Saka, Cafer2024-12-242024-12-2420210360-31991879-3487https://doi.org/10.1016/j.ijhydene.2021.03.001https://hdl.handle.net/20.500.12604/6565Micro algae based on Spirulina platensis is successfully used for the synthesis of S and N-doped metal-free carbon materials. The procedure consists of three stages; (i) Activated carbon production by KOH activation in CO2 atmosphere (S-AC), (ii) S atom doping to the obtained S-AC using sulphuric acid by hydrothermal activation (S-AC-S), (iii) N atom doping by hydrothermal activation to S-AC obtained using nitric acid (S-AC-S-N). The S and N doped metal-free catalysts are used for H-2 release in NaBH4 methanolysis reaction (NaBH4-MR) for the first time. The metal-free carbon catalysts are characterized by X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM-EDS), X-ray diffractometer spectroscopy (XRD), Fourier-transform infrared spectroscopy (FTIR), nitrogen adsorption and elemental analysis (CHNS) methods. When the HGR values obtained for S-AC-S-N (26,000 mL min(-1) g(-1)) and S-AC (2641 mL min(-1) g(-1)) are compared, there is a 9.84 fold increase. Activation energy (Ea) value for S-AC-S-N was 10.59 kJ mol(-1). (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.eninfo:eu-repo/semantics/closedAccessMetal-free catalystSulphurNitrogenMicroalgaeHydrogenMethanolysisArticle46351832618337Q2WOS:000648404800013Q12-s2.0-8510356143610.1016/j.ijhydene.2021.03.001