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Research Article

Acid modified graphite felt cathode electrode for low temperature H2/Br2 redox flow battery

Büşranur Duman, Berker Fıçıcılar

Department of Chemical Engineering, Ondokuz Mayıs University, Samsun, Turkey                                                                                        

Keywords

Abstract




Hydrogen-bromine flow battery;

 
Graphite felt;


Surface modification



In this study, the performance of a modified PAN based graphite felt, an alternative electrode for cathode, was investigated for hydrogen/bromine flow battery. In these experiments, carbon paper was used as porous transport layer in the anode and graphite felt (GF) was used as the catalytically active electrode in the cathode. Graphite felt electrode used for cathode is also used in industry as thermal insulation material. The cathode kinetics of this relatively low cost material was increased by acidic modification and used in flow battery cathode electrodes. To create functional groups on the cathode electrode, acidic surface modification of the graphite felt was carried out with H2SO4 and HNO3 acid pairs with a volumetric ratio of VH2SO4 / VHNO3 = 3:1. XRD and SEM analyzes were used for physical characterization of the modified graphite felt electrodes. Single cell potentiostatic polarization and power curves of the hydrogen/bromine flow battery were obtained to elucidate the effect of cathode graphite felt surface modification. In this study, comparison tests were performed for pristine graphite felt and modified graphite felt. The maximum powers detected from the single cell flow battery formed by pristine graphite felt and modified graphite felt cathode electrodes are 0.32 W/cm2 (0.65V) and 0.40 W/cm2 (0.65V), respectively. In flow battery tests, this 25% power increase in similar voltage values may be attributed to the improvement of the weak electrochemical properties of the graphite felt electrode by acidic modification.

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22/02/2021 Indexed by InfoBase Index: We are informed that our journal is accepted to be included in the InfoBase Index. 


11/02/2021 Collaboration for ULIBTK 2021: Editorial Board of our journal and Organizing Committee of the 23. Congress on Thermal Science and Technology (ULIBTK 2021) have agreed to collaborate. Extended versions of the selected papers from the conference will be published in our journal. For more see Events.


31/12/2020 Most Cited Award: 

According to the Editorial Board evaluation, the paper authored by Nelson Batista, Rui Melicio, Victor Mendes entitled as “Darrieus vertical axis wind turbines: methodology to study the self-start capabilities considering symmetric and asymmetric airfoils" is awarded the 2020 Most Cited Paper Award of Research on Engineering Structures and Materials (RESM).


31/12/2020 Best Paper Award:

According to the Advisory Board decision, the paper authored by Marcelo Mesquita do Amaral, Matheus Wanglon Ferreira and Mauro de Vasconcellos Real entitled as “A simplified method for analysis of reinforced concrete beams exposed to fire situation” is awarded the 2020 Best Paper Award of Research on Engineering Structures and Materials (RESM).


02/11/2020 Indexed by SCOPUS: We are informed that our journal is accepted to be included in the SCOPUS Index. See news for more info.


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LATEST AWARDS


2020 Most Cited Paper Award:

The paper authored by Nelson Batista, Rui Melicio, Victor Mendes entitled as “Darrieus vertical axis wind turbines: methodology to study the self-start capabilities considering symmetric and asymmetric airfoils" is awarded the


2020 Best Paper Award:

The paper authored by Ahsen Ünal, Işıl Özer, Melek Erol Taygun, Sadriye Küçükbayrak entitled as “Fabrication and in-vitro evaluation of copper doped bioactive glass/polymer composite scaffolds for bone tissue engineering” is awarded the 


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Last Update:

01.04.2021

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