1. School of Mathematical and Physical Sciences, University of Technology Sydney, Ultimo, New South Wales 2007, Australia
2. Physics Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
3. Chemistry Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
4. Center of Hydrogen and Energy Storage (IRC-HES), King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia