Matibag, Via Kryshl Ranillo, Hannah Grace Defeo Geronimo, Jonyl Lomigo Garcia, and Bernard John Vallejos Tongol. 2019. “Platinum-Free Electrocatalyst for Oxygen Reduction Reaction Derived from the Direct Pyrolysis of Waste Watermelon Peels”. International Journal of Integrated Engineering 11 (7): 175-81. https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/4639.