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Edge enriched cobalt ferrite nanorods for symmetric/asymmetric supercapacitive charge storage

IR@NPL: CSIR-National Physical Laboratory, New Delhi


Field	Value

Title	Edge enriched cobalt ferrite nanorods for symmetric/asymmetric supercapacitive charge storage

Creator	Lalwani, Shubra Marichi, Ram Bhagat Mishra, Monu Gupta, Govind Singh, Gurmeet Sharma, Raj Kishore

Subject	Electrochemistry

Description	For maximum and efficient charge storage and delivery, porous nanorods with active sites can offer a unique set of advantages. Herein, hierarchically porous (0.2-200 nm) cobalt ferrite (CoFe2O4) nanorods are hydrothermally prepared by tuning oleic acid concentration (100-500 mu L with subsequent annealing (400 degrees C). These hierarchical pores (with edges and cavities) raise the specific surface area of CoFe2O4 nanorods to 154 m(2)g(-1). In addition, 80% of CoFe2O4 sites become accessible boosting the capacitance to a high value (460.5 Fg(-1) at 1.0 Ag-1), while retaining excellent cyclic stability (95.8% for 5000 cycles). Maximum pseudocapacitive contribution from these electrochemically active sites is ensured by rapid diffusion of electrolytic OH- ions (5.8 x 10(-8)cm(2)s(-1)). Moreover, on assembling these nanorods as a positive electrode in asymmetric configuration (graphene nanoribbons as negative electrode), the cell exhibits an outstanding energy density (33.5 Wh kg(-1) at 727.8 W kg(-1)), almost double of its symmetric (16.5 Wh kg(-1) at 288 W kg(-1)) counterpart.

Publisher	Elsevier

Date	2018-09-01

Type	Article PeerReviewed

Format	application/pdf

Identifier	http://npl.csircentral.net/3846/1/Edge%20enriched%20cobalt%20ferrite%20nanorods%20for%20symmetric.pdf Lalwani, Shubra and Marichi, Ram Bhagat and Mishra, Monu and Gupta, Govind and Singh, Gurmeet and Sharma, Raj Kishore (2018) Edge enriched cobalt ferrite nanorods for symmetric/asymmetric supercapacitive charge storage. Electrochimica Acta (283). pp. 708-717. ISSN 0013-4686

Relation	http://npl.csircentral.net/3846/