Abstract
In this paper, mathematical modelling of oxidation-reduction redox potential for estimating the state-ofcharge of V-RFB is presented. The estimation is based on the Nernst equation, a mass balance, Faraday’s law of electrolysis, and 1 st order kinetic equation. The 25-100 cm 2 laboratories, unit cell V-RFB is chosen as a model reaction for electrolyte redox potential measurement. Preliminary experiment is carried out using a 100 cm 2 laboratory unit but the estimated value produced is inaccurate. An alternative design of 25 cm 2 laboratory, unit cell V-RFB using a divided, open-circuit potentiometric cell is used. The redox potential of V(III)/V(II) and V(IV)/V(V) is measured through combined Hg/Hg 2 SO 4 reference electrode and carbon rod working electrode. The differences between the experimental and estimated values are highlighted. DOI: http://dx.doi.org/10.5755/j01.eee.19.3.1623
Highlights
Current economic developments demand stability in energy security for future accessibility [1]
Redox flow battery (RFB), developed in the 1970s [2] and shares similar principles as fuel cells, is a rechargeable battery that uses flowing redox species that flow through cell stack to convert chemical energy into electricity
An all-vanadium redox flow battery (V-RFB) is one of the electrochemical energy storage systems that is suitable for many applications due to its high energy efficiency (>80%) [4], [5]
Summary
Current economic developments demand stability in energy security for future accessibility [1]. Redox flow battery (RFB), developed in the 1970s [2] and shares similar principles as fuel cells, is a rechargeable battery that uses flowing redox species that flow through cell stack to convert chemical energy into electricity. RFB has the ability to decouple its power component from the energy components. Its modular nature presents it as a viable option for use in many applications, such as uninterrupted power supply, load levelling and stand-alone applications [3]. An all-vanadium redox flow battery (V-RFB) is one of the electrochemical energy storage systems that is suitable for many applications due to its high energy efficiency (>80%) [4], [5].
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