Electrochemical performance of graphene oxide modified graphite felt as a positive electrode in all-iron redox flow batt
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RESEARCH ARTICLE
Electrochemical performance of graphene oxide modified graphite felt as a positive electrode in all‑iron redox flow batteries M. S. Anantha1,2 · D. Anarghya1,2 · Chunyan Hu3,4 · Narendra Reddy1 · Krishna Venkatesh1 · H. B. Muralidhara1 Received: 14 March 2020 / Accepted: 17 September 2020 © Springer Nature B.V. 2020
Abstract In this study, we demonstrate that coating a layer of graphene oxide (GO) onto graphite felts (GF) by electrostatic spraying can substantially increase the performance of all-iron redox flow batteries (IRFBs). Graphite felts are extensively used as electrodes but they do not have the desired electrochemical properties. GO has good electrochemical features. Hence, GO was synthesized from graphite powder and applied onto graphite felts. Chemical and structural features of the bare graphite felt electrode (BGF), thermally treated graphite felt electrode (TTGF), and graphene oxide modified graphite felt electrode (GOMGF) were characterized using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray Analysis (EDX), Transmission Electron Microscopy (TEM), Raman Spectroscopy (RS), X-Ray Photoelectron Spectroscopy (XPS) and Brunauer–Emmett–Teller (BET) surface area analysis. Similarly, the electrochemical performance was evaluated using Cyclic Voltammetry (CV), Electrochemical Impedance Spectroscopy (EIS), Tafel analysis and charge–discharge experiments. The Charge–discharge experiments were performed at 1 to 5 m gcm−2 weight of GO on the modified −2 graphite felt electrode and varying the current densities from 10 to 40 mAcm . The coulombic efficiency (ηC) and energy efficiency (ηE) of the cell determined at 20 mAcm−2 for 4 mgcm−2-GOMGF electrodes were found to be 64.61% and 50.27%, respectively. Among the three different types of electrodes, the GOMGF electrode showed better electrocatalytic performance mainly due to the excellent conducting network of the defective edges of oxygen on the surface of layered flakes of the GO. After twenty cycles, the average ηC and ηE of the cell using a 4 mgcm−2-GOMGF electrode were found to be 62.06% and 42.02%, respectively.
* H. B. Muralidhara [email protected] 1
Centre for Incubation, Innovation, Research and Consultancy (CIIRC), Jyothy Institute of Technology, Thataguni, Off Kanakapura Road, Bangalore, Karnataka 560082, India
2
Research Resource Centre. Jnana Sangama, Visvesvaraya Technological University, Belagavi, Karnataka 590018, India
3
College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, People’s Republic of China
4
National Engineering Research Center for Dyeing and Finishing of Textiles, Donghua University, Shanghai 201620, People’s Republic of China
13
Vol.:(0123456789)
Journal of Applied Electrochemistry
Graphic abstract
Keywords Graphene oxide · Electrocatalyst · Graphite felt · Coulombic efficiency
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