1. Electrochemical Reaction and Technology Laboratory (ERTL); School of Environmental Science and Engineering; Gwangju Institute of Science and Technology (GIST); Gwangju 500-712 South Korea
2. 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