[1] Alagappa Univ, Dept Phys, Nanomat Lab, Karaikkudi 630003, Tamil Nadu, India
[2] CSIR, Cent Electrochem Res Inst, CECRI, Electro InorganicDiv, Karaikkudi 630003, Tamil Nadu, India
[3] CSIR, Cent Electrochem Res Inst, CECRI, Electrod & Electrocatalysis EEC Div, Karaikkudi 630003, Tamil Nadu, India