PrabakaranK KavinkumarT ShafiPM ShobinLR MangalarajaRV BhaviripudiVR AbarzúaCV ThirumuruganARUN THIRUMURUGANCarolina Venegas Abarzúa2025-06-052025-06-0520241387-7003https://hdl.handle.net/20.500.12740/22654The precise design and surface modification of electrode materials are crucial challenges for advancing the supercapacitor technology. In this study, we report a straightforward two-step process for the synthesis of a cobalt ferrite (CoFe2O4)/carbon hetero nanostructure. The CoFe2O4 nanoparticles were first synthesized using a simple chemical oxidation method, followed by carbon modification using glucose. The modified samples were calcined at 400 and 600 degrees C for 4 h in N2 atmosphere to optimize the structural and electrochemical properties. The increase in the grain size of carbon modified cobalt ferrite magnetic nanoparticles (MNPs) was observed from 22 to 28 nm with post annealing temperature. The presence of carbon was confirmed by the FTIR spectroscopy, FESEM and TEM analyses. The carbon decoration on the cobalt ferrite partially showed a core-shell like morphology. The saturation magnetization of bare cobalt ferrite was observed to be 76 emu/g and the same was decreased by the surface modification with carbon. A high specific capacitance of 323 F/g was observed for the carbon-modified cobalt ferrite MNPs annealed at 600 degrees C. The electrochemical impedance spectroscopy (EIS) analysis demonstrated that the charge-transfer resistance (Rct) decreased significantly in the carbon-modified CoFe2O4 MNPs, particularly for the sample annealed at 600 degrees C, with an Rctvalue of 17 Omega. The carbon layer effectively enhanced conductivity and reduced the electrode/electrolyte interface, led to the improved electrochemical performance, as reflected in the enhanced specific capacitance. An improved capacitance retention of 84 % was achieved in the case of carbon-modified cobalt ferrite MNPs based electrode even after 4000 cycles. The study suggested that the prepared carbon-modified cobalt ferrite MNPs stand in the limelight as a better candidate electrode material for the electrochemical applications. C1 [Prabakaran, K.] KPR Inst Engn & Technol, Dept Phys, Coimbatore 641407, India. [Kavinkumar, T.] Karpagam Acad Higher Educ, Ctr Energy & Environm, Dept Phys, Coimbatore 641021, India. [Shafi, P. Muhammed] Natl Inst Technol Calicut, Dept Phys, Calicut 673601, Kerala, India. [Shobin, L. R.] SRM Inst Sci & Technol SRMIST, Dept Phys, Tiruchirappalli Campus, Tiruchirappalli 621105, Tamil Nadu, India. [Mangalaraja, Ramalinga Viswanathan] Univ Adolfo Ibanez, Fac Sci & Engn, Diagonal Torres 2640, Santiago 7941169, Chile. [Mangalaraja, Ramalinga Viswanathan] Univ Arturo Prat, Vicerrectoria Invest Innovac, Ave Arturo Prat 2120, Iquique 1110939, Chile. [Bhaviripudi, Vijayabhaskara Rao] Univ Tecnol Metropolitana, Dept Fis, Ave Jose Pedro Alessandri 1242, Santiago 7800002, Chile. [Abarzua, Carolina Venegas; Thirumurugan, Arun] Univ Atacama, Sede Vallenar, Vallenar 1612178, Chile. C3 Karpagam Academy of Higher Education (KAHE); National Institute of Technology (NIT System); National Institute of Technology Calicut; SRM Institute of Science & Technology Chennai; Universidad Adolfo Ibanez; Universidad Arturo Prat; Universidad Tecnologica Metropolitana; Universidad de Atacamainfo:eu-repo/semantics/closedAccessCobalt ferritesMagnetic nanoparticlesCapacitanceCarbonSupercapacitorChemistryArticulo de revista10.1016/j.inoche.2024.113534