1 23 Journal of Solid State Electrochemistry Current Research and Development in Science and Technology ISSN 1432-8488 J Solid State Electrochem DOI 10.1007/s10008-013-2355-1 Preparation and electrochemical performance of porous hematite (α-Fe 2 O 3 ) nanostructures as supercapacitor electrode material S. Shivakumara, Tirupathi Rao Penki & N. Munichandraiah