Highly ordered iron oxide-mesoporous fullerene nanocomposites for oxygen reduction reaction and supercapacitor applications
Date
2019
Authors
Benzigar, M.R.
Joseph, S.
Saianand, G.
Gopalan, A.I.
Sarkar, S.
Srinivasan, S.
Park, D.H.
Kim, S.
Talapaneni, S.N.
Ramadass, K.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Journal article
Citation
Microporous and Mesoporous Materials, 2019; 285:21-31
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Abstract
In this study, we report a facile synthetic strategy to embed ultra-small iron oxide nanoparticles within the channels of highly ordered mesoporous fullerene (C 60 ) (Fe-MFC 60 -T, where T denotes the temperature of the template synthesis). The present work is judicially designed to form the hematite phase of iron oxide (α-Fe 2 O 3 ) nanoparticles (NPs) through the subsequent calcination of Fe-MFC 60 -T. The Fe-MFC 60 -T materials were analysed comprehensively for obtaining their physico-chemical properties. Among the materials studied, Fe-MFC 60 -150 exhibits a unique doughnut-shaped morphology with a high specific surface area (∼598 m 2 g −1 ), crystalline wall structure, and well-ordered porosity. The Fe-MFC 60 -150 displays an adequate oxygen reduction reaction (ORR) activity with a positive onset potential at 0.85 V (vs RHE) and half wave potential at 0.78 V (vs RHE), low Tafel slope (66 mV per decade), high exchange current density (1.2 × 10 −10 A cm −2 ), and good tolerance towards methanol crossover. We also demonstrate that Fe-MFC 60 -150 is capable of delivering a specific capacitance of 112.4 F g −1 at 0.1 A g −1 . The electrochemical performance of Fe-MFC 60 -150 towards ORR and supercapacitor can be ascribed to the synergistic coupling effects between the active sites of α-Fe 2 O 3 and MFC 60.
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Data source: Supplementary data, https://doi.org/10.1016/j.micromeso.2019.04.071
Link to a related website: http://eprints.iisc.ac.in/63105/7/1-s2.0-S1387181119302987-mmc1%20%281%29.docx, Open Access via Unpaywall
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Copyright 2019 Elsevier