MoSe 2 nanoflowers as efficient electrode materials for supercapacitors

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MoSe2 nanoflowers as efficient electrode materials for supercapacitors M. Manuraj1, S. Jyothilakshmi1, K. N. Narayanan Unni1,*, and R. B. Rakhi1,2,*

1

Photosciences and Photonics Section, CSTD, CSIR-NIIST, Research Centre, University of Kerala, Thiruvananthapuram, Kerala 695019, India 2 Department of Physics, University of Kerala, Kariavattom Campus, Thiruvananthapuram, Kerala 695581, India

Received: 15 May 2020

ABSTRACT

Accepted: 30 September 2020

Herein, we report a facile hydrothermal synthesis of MoSe2 nanoflowers composed of several MoSe2 nanosheets for electrochemical energy storage. As an electrode material of supercapacitor, MoSe2 nanoflower exhibits high specific capacitance (95 Fg-1) and excellent cycling stability (90% after 10,000 cycles) due to their porous morphology, indicating their applicability as a potential electrode material for energy storage devices.

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Springer Science+Business

Media, LLC, part of Springer Nature 2020

1 Introduction The need for clean energy alternatives and potential energy storage devices is a paramount concern for the scientific society owing to the increasing demand for energy and depletion of fossil fuels [1]. Lithiumion battery is one such dominant device powering almost all types of electronic devices, but its application is limited due to its low power density, poor life cycle, chances of having fire hazards, toxicity, etc. [2–4]. Supercapacitor (SC) or ultracapacitor is an intermediate device that acts as a bridge between ordinary capacitor and battery offering higher capacitance through its fast surface redox reactions with extremely high power density [5]. Moreover, it displays advantages such as long life cycle, fast charge–discharge property, and low toxicity. [6–8].

Although the energy density of SCs is estimated to be larger than that of the conventional capacitors, it is considerably lesser than that of batteries/Fuel cells. SCs with superior capacitive properties are needed for the practical applications and its performance is largely determined by the electrode materials. Hence, to enhance the energy density and specific power of SCs, researchers are striving to develop cost effective and environmental friendly electrode materials [9]. Based on the storage mechanism, SCs can be classified into two categories viz. Electric double layer capacitors (EDLCs) and pseudocapacitors. While EDLC is based on carbon or carbon-based hybrid materials with larger pore size and surface area, as electrode materials, the latter uses conductive polymers or transition metal oxides and chalcogenides [10–12].

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https://doi.org/10.1007/s10854-020-04577-z

J Mater Sci: Mater Electron

The use of transition metal dichalcogenides (TMDs) is getting considerable attention in the field of electrochemistry as well as other electronic applications, by virtue of their exceptional chemical, electronic, and physical properties [13]. Among the various TMDs, MoSe2 is

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