1. Department of Energy Science and Engineering, Stanford University, Stanford, California, USA
2. Department of Electrical Engineering, School of Engineering University of Petroleum & Energy Studies, Dehradun, India
3. LRGP-CNRS, University of Lorraine, Nancy, France
4. Department of Chemistry and Biofuel Research Laboratory, Centre of Alternative and Renewable Energy, School of Engineering, University of Petroleum & Energy Studies (UPES), Dehradun, India