[1] Univ Malaya, Fac Engn, Dept Chem Engn, Kuala Lumpur 50603, Malaysia
[2] Univ London Imperial Coll Sci Technol & Med, Energy Futures Lab, London SW7 2AZ, England
[3] Sultan Qaboos Univ, Petr & Chem Engn Dept, Muscat 123, Oman
[4] King Saud Univ, Coll Engn, Dept Chem Engn, Riyadh 11421, Saudi Arabia
[5] Univ Southampton, Fac Engn & Environm, Energy Technol Res Grp, Electrochem Engn Lab, Southampton SO17 1BJ, Hants, England