Comprehensive investigation on sodium hypochlorite as oxidant in half cell and direct sodium borohydride fuel cell (DSBFC) for low-cost electrical power generation

The electrochemical reduction of sodium hypochlorite in alkaline medium was thoroughly studied on commercial cathode Pt(40 wt.%)/C HSA electrocatalyst to enhance the performance of a DSBFC. The cyclic voltammetry (CV) study and chronoamperometry (CA) tests using PGSTAT 204, Autolab Netherland, were...

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Bibliographic Details
Published in:Ionics 2024, Vol.30 (7), p.4075-4090
Main Authors: Yadav, Neeraj Kumar, Pramanik, Hiralal
Format: Article
Language:English
Subjects:
Cathodes
Chemical reduction
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Current density
Effectiveness
Electrocatalysts
Electrochemical analysis
Electrochemistry
Electrolytes
Electrons
Energy Storage
Fuel cells
Maximum power density
Optical and Electronic Materials
Oxidizing agents
Parameters
Renewable and Green Energy
Sodium hydroxide
Sodium hypochlorite
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Summary:The electrochemical reduction of sodium hypochlorite in alkaline medium was thoroughly studied on commercial cathode Pt(40 wt.%)/C HSA electrocatalyst to enhance the performance of a DSBFC. The cyclic voltammetry (CV) study and chronoamperometry (CA) tests using PGSTAT 204, Autolab Netherland, were carried out in a three-electrode half-cell setup to investigate the electrochemical behaviour of oxidant NaOCl in alkaline medium. The effect of various parameters such as oxidant NaOCl concentration, electrolyte (NaOH) concentration and cathode electrocatalyst loading was thoroughly studied and optimized using CV in half-cell and single-cell configuration. The optimum values of oxidant/NaOCl concentration, electrolyte/NaOH concentration and cathode electrocatalyst loading were found to be 2 M, 1 M and 2 mg/cm 2 , respectively, in half-cell CV analysis. The single-DSBFC study was also performed to validate the optimum values of the effective parameters which were found to be the same as that of the half-cell study. In the single-DSBFC study, the maximum power density of 58.80 mW/cm 2 at the current density of 112 mA/cm 2 was achieved at the cell temperature of 30 °C, whereas the maximum power density of 69.44 mW/cm 2 at the current density of 160 mA/cm 2 was achieved at the cell temperature of 60 °C. The power density of DSBFC increased by 18.09% when the cell temperature was raised from 30 to 60 °C. Graphical Abstract
ISSN:0947-7047
1862-0760
DOI:10.1007/s11581-024-05565-7