1. Fuel Cell Institute, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
2. Department of Mechanical and Materials Engineering, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
3. Department of Mechanical Engineering, Universitas Bung Hatta, 25143 Padang, West Sumatera, Indonesia