Sulfonated PEI membrane with GPTMS-TiO2 as a filler for potential direct methanol fuel cell (DMFC) applications. Mal. J. Fund. Appl. Sci. [Internet]. 2019 Aug. 25 [cited 2026 Sep. 7];15(4):555-60. Available from: https://mjfas.utm.my/index.php/mjfas/article/view/1216