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. Solar Cell Applications Research Lab, Department of Physics, Government College University Lahore, Lahore, Punjab 54000, Pakistan
4. Centre for Nano and Material Science, JAIN University, Jain Global Campus, Bangalore 562112, Karnataka, India