High-Porosity Hydrochar From Oil Palm Empty Fruit Bunches Via Single-Step Hydrolytic Agent-Assisted Hydrothermal Carbonization. Indonesian J. Sci. Technol [Internet]. 2025 Jul. 8 [cited 2025 Jul. 15];9(3):709-20. Available from: https://ejournal.kjpupi.id/index.php/ijost/article/view/395