Ternary alkali metal chalcogenide engineered reduced graphene oxide (rGO) as a new class of composite (NaFeS2-rGO) and its electrochemical performance

R. Ashwini; V.G. Dileepkumar; K.R. Balaji; R. Viswanatha; C.R. Ravikumar; Chandan Srivastava; Mysore Sridhar Santosh

Sensors International (Jan 2021)

Ternary alkali metal chalcogenide engineered reduced graphene oxide (rGO) as a new class of composite (NaFeS2-rGO) and its electrochemical performance

R. Ashwini,
V.G. Dileepkumar,
K.R. Balaji,
R. Viswanatha,
C.R. Ravikumar,
Chandan Srivastava,
Mysore Sridhar Santosh

Affiliations

R. Ashwini: Centre for Incubation, Innovation, Research and Consultancy (CIIRC), And Department of Chemistry, Jyothy Institute of Technology, Thataguni, Off Kanakapura Road, Bangalore, 560082, Karnataka, India; Visvesvaraya Technological University, Jnana Sangama, Machhe, Belgaum, 590018, Karnataka, India
V.G. Dileepkumar: Centre for Incubation, Innovation, Research and Consultancy (CIIRC), And Department of Chemistry, Jyothy Institute of Technology, Thataguni, Off Kanakapura Road, Bangalore, 560082, Karnataka, India
K.R. Balaji: Centre for Incubation, Innovation, Research and Consultancy (CIIRC), And Department of Chemistry, Jyothy Institute of Technology, Thataguni, Off Kanakapura Road, Bangalore, 560082, Karnataka, India; Visvesvaraya Technological University, Jnana Sangama, Machhe, Belgaum, 590018, Karnataka, India
R. Viswanatha: Centre for Incubation, Innovation, Research and Consultancy (CIIRC), And Department of Chemistry, Jyothy Institute of Technology, Thataguni, Off Kanakapura Road, Bangalore, 560082, Karnataka, India
C.R. Ravikumar: Research Centre, Department of Science, East West Institute of Technology, Bangalore, 560091, Karnataka, India
Chandan Srivastava: Department of Materials Engineering, Indian Institute of Science, C.V. Raman Road, Bengaluru, 560012, Karnataka, India
Mysore Sridhar Santosh: Coal and Mineral Processing Division, CSIR – Central Institute of Mining and Fuel Research (CIMFR), Digwadih Campus, PO: FRI, Dhanbad, 828108, Jharkhand, India; Corresponding author.

Journal volume & issue: Vol. 2
p. 100125

Abstract

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By employing a simple hydrothermal process, a new class of ternary alkali metal-based chalcogenide (NaFeS2 (NFS)) has been produced and anchored on to reduced graphene oxide (rGO) sheets for the first time. Transition metal-based chalcogenides (TMC) exhibit limited conductivity because of their semiconducting nature and hence, engineering TMCs with 2D carbonaceous materials yields better catalytic performance. Alkali metal-based chalcogenides and their composites appear to be promising alternatives, whose electrochemical properties haven't been explored much. This work presents a detailed insight into the structure and morphology of the prepared NFS-rGO composite, along with its electrochemical properties. The cyclic voltammetry (CV) response at the NFS-rGO composite electrode for the redox probe K4Fe(CN)6 is better with low peak to peak separation potentials (ΔEp = 99 mV) compared to the individual components NFS (ΔEp = 190 mV) and GO (∆Ep = 130 mV), indicating a better electron transfer kinetics. The NFS-rGO composite electrode displays an enhanced electrocatalytic activity as evidenced by the high electrochemically active surface area (6.09 × 10−2 cm2) and the heterogeneous electron transfer rate constant (k0 = 5.4 × 10−2 cms−1). In general, the NFS-rGO composite exhibits excellent material as well electrocatalytic properties due to the synergistic effect between NFS and rGO and can further be explored for electrochemical sensing applications as well.

Published in Sensors International

ISSN: 2666-3511 (Online)
Publisher: KeAi Communications Co., Ltd.
Country of publisher: China
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://www.keaipublishing.com/en/journals/sensors-international/

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