1. Department of Energy Storage/Conversion Engineering, Hydrogen and Fuel Cell Research Center, Chonbuk National University, Jeollabuk-do 54896, Korea
2. Department of Bioenvironmental Chemistry and R&D Center for CANUTECH, Business Incubation Center, Chonbuk National University, Jeollabuk-do 54896, Korea
3. Department of Dental Biomaterials, School of Dentistry, Chonbuk National University, Jeollabuk-do 54896, Korea