Natural carbonate mineral as a sustainable catalyst: NaBH4 methanolysis and electrooxidation applications
Materials Science and Engineering: B, cilt.334, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 334
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.mseb.2026.119813
- Dergi Adı: Materials Science and Engineering: B
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Chimica, Compendex, INSPEC, Academic Search Ultimate (EBSCO), Engineering Source (EBSCO)
- Anahtar Kelimeler: Dolomite, Electrooxidation, Hydrogen, Methanolysis, Sodium borohydride
- Eskişehir Osmangazi Üniversitesi Adresli: Evet
Özet
This study investigates the utility of dolomite, a natural and abundant mineral, as a catalyst in hydrogen production via methanolysis of sodium borohydride (NaBH4) and in the NaBH4 electrooxidation processes, without any chemical or thermal pre-treatment. The structural, morphological, and chemical properties of dolomite are characterized using X-ray diffraction (XRD), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and N2 adsorption-desorption. In the methanolysis experiments, the effects of catalyst amount, NaBH4 amount, methanol volume, and temperature on the hydrogen production rate are investigated; the optimum conditions are determined to be 25 mg of catalyst, 150 mg of NaBH4, 6 mL of methanol, and 50 °C. Under these conditions, the hydrogen generation rate with dolomite mineral reaches 14,591.52 mL/gcat.min, and the activation energy is calculated as 16.92 kJ/mol. The current density of 1.87 mA/cm2 is obtained in the electrooxidation of NaBH4 with dolomite mineral. Furthermore, long-term stability and low charge transfer resistance are achieved at 0.8 V. These results demonstrate that natural dolomite mineral has potential as a low-cost, environmentally friendly catalyst for both hydrogen production and electrooxidation studies.