1. School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
2. Centre of Hydrogen Energy, Institute of Future Energy, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
3. Centre for Nano and Material Science, JAIN University, Jain Global Campus, Bangalore 562112, Karnataka, India
4. Solar Cell Applications Research Lab, Department of Physics, Government College University Lahore, 54000, Punjab, Pakistan
5. Core Research Facilities, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia