1. Ertl Center for Electrochemistry and Catalysis,
Research Institute for Solar and Sustainable Energies (RISE), Gwangju Institute of Science and Technology (GIST), Gwangju 500-712 South Korea
2. Electrochemical Reaction & Technology Laboratory (ERTL), School of Environmental Science and Engineering, GIST, Gwangju 500-712, South Korea
3. Laboratory of Electrochemical Engineering (LEE), Department
of Chemical Engineering, College of Engineering, University of the Philippines Diliman, Quezon City 1101, Philippines