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Title: Intercalation pseudocapacitance in chemically stable Au-α-Fe2O3-Mn3O4 composite nanorod: Towards highly efficient solid-state symmetric supercapacitor device
Authors: Rudra S.
Chakraborty R.
Maji, Pradip K.
Koley S.
Nayak A.K.
Paul D.
Pradhan M.
Published in: Electrochimica Acta
Abstract: Pseudocapacitance generally appears due to the surface or near-surface reversible Faradaic reactions. In this regard, 2D layered materials have gained substantial attention as a potential source for driving a myriad of energy storage applications owing to their unique surface-structure relationship. Here, we have demonstrated that a pseudocapacitive mechanism becomes increasingly operative when H+ ions are intercalated easily into the enhanced van der Waals gap of layered material α-Fe2O3 in Au-α-Fe2O3-Mn3O4 nanocomposite. Theoretical studies have shown an enhancement of van der Waals gap which is attributed to the intercalation of Au into the layers of α-Fe2O3. Structural and compositional characterizations have been carried out in detailed by different physical methods and are supported by theoretical studies. Electrochemical measurements show excellent specific capacitance of 580 F g−1 at 1 A g−1 along with improved capacity retention compared to the mother component α-Fe2O3 (205 F g−1 at 1 A g−1) in 0.5 M H2SO4 electrolyte in a potential window of 1.2 V. Further, electrokinetic measurements revealed that total charge stored in the nanocomposite is based on a dominant capacitive mechanism (70% of the total capacitance) along with diffusive mechanism (30% of the total capacitance) at scan rate 5 mV s−1 whereas, α-Fe2O3 exhibits 34% capacitive and 66% diffusive at same scan rate. The synthesized composite nanorod as an efficient electrode material in a solid-state symmetric supercapacitor device exhibits excellent energy density of 36.12 Wh kg−1 and power density of 1994 W kg−1 at 1 A g−1 and 10 A g−1, respectively with outstanding stability (89%) up to 2000 successive charge-discharge cycles at 10 A g−1. This work may offer a new scope for further development of intercalation pseudocapacitive nanomaterials towards achieving high energy storage supercapacitors. © 2019 Elsevier Ltd
Citation: Electrochimica Acta (2019), 324(): -
Issue Date: 2019
Publisher: Elsevier Ltd
Keywords: Chemical stability
Enhanced van der waals gap
High electrochemical energy storage
Intercalation pseudocapacitance
Redox mediated methodology
ISSN: 134686
Author Scopus IDs: 57202901140
Author Affiliations: Rudra, S., Department of Chemistry, National Institute of Technology Meghalaya, Shillong, Meghalaya 793003, India
Chakraborty, R., Department of Chemistry, National Institute of Technology Meghalaya, Shillong, Meghalaya 793003, India
Maji, P.K., Department of Polymer & Process Engineering, Indian Institute of Technology Roorkee, Saharanpur Campus, Saharanpur, Uttar Pradesh 247001, India
Koley, S., Department of Physics, North Eastern Hill University, Umshing Mawkynroh, Shillong, Meghalaya 793022, India
Nayak, A.K., Department of Physics, School of Advanced Sciences, Vellore Institute of Technology, Vellore, Tamil Nadu 632014, India
Paul, D., Department of Chemistry, Indian Institute of Technology Guwhati, North Guwahati, Amingaon, Assam 781039, India
Pradhan, M., Department of Chemistry, National Institute of Technology Meghalaya, Shillong, Meghalaya 793003, India
Funding Details: Authors are thankful to Dr. Achinta Singha, Bose Institute and IIT Roorkee for analytical support; Prof. Tarasankar Pal, IIT Kharagpur for his valuable suggestions; Department of Chemistry, NIT Meghalaya for providing a research platform and DST INSPIRE grant (DST/INSPIRE Faculty Award/2016/DST/INSPIRE/04/2015/003227) for financial support. Sudipta Koley acknowledges support from DST women scientist grant SR/WOS-A/PM-80/2016(G) .
Corresponding Author: Pradhan, M.; Department of Chemistry, National Institute of Technology MeghalayaIndia; email:
Appears in Collections:Journal Publications [PE]

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