1. Department of Chemistry, Bharath Institute of Higher Education and Research, Bharath University, Chennai 600073, Tamil Nadu, India
2. Department of Inorganic Chemistry, University of Madras, Guindy, Chennai 600025, Tamil Nadu, India
3. School of Chemistry and Physics, University of KwaZulu-Natal, Durban 4000, South Africa
4. Council for Scientific and Industrial Research (CSIR), Energy Centre, P.O. Box 395, Pretoria 0001, South Africa
5. Thiruvalluvar University, Serkkadu, Vellore 632115, Tamil Nadu, India