1. Fuel Cell Institute, Universiti Kebangsaan Malaysia (UKM), 43600 Bangi, Selangor, Malaysia
2. Department of Chemical and Process Engineering, Universiti Kebangsaan Malaysia (UKM), 43600 Bangi, Selangor, Malaysia
3. Department of Electrical, Electronic and System, Universiti Kebangsaan Malaysia (UKM), 43600 Bangi, Selangor, Malaysia