<P><B>Abstract</B></P> <P>Experimental and numerical studies have been carried out to improve the flow distribution by optimizing the local porosity of the electrodes of the all-vanadium redox flow batteries (VFBs) to in...
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https://www.riss.kr/link?id=A107524966
2019
-
SCOPUS,SCIE
학술저널
26-35(10쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
<P><B>Abstract</B></P> <P>Experimental and numerical studies have been carried out to improve the flow distribution by optimizing the local porosity of the electrodes of the all-vanadium redox flow batteries (VFBs) to in...
<P><B>Abstract</B></P> <P>Experimental and numerical studies have been carried out to improve the flow distribution by optimizing the local porosity of the electrodes of the all-vanadium redox flow batteries (VFBs) to increase the energy efficiency at high current density. We control the local porosity by inserting extra layer of electrode at inlet and outlet, and the flow field of electrolyte is analyzed numerically. First, the flow field of electrolyte is analyzed numerically to understand distribution of electrolyte in the electrode. Then, the charge and discharge curve is analyzed to understand the effect of local porosity of electrode on the energy efficiency. At 50 mA/cm<SUP>2</SUP>, the energy efficiency is the highest when using electrode with uniform porosity. At 150 mA/cm<SUP>2</SUP>, however, the energy efficiency of the cell using the electrode with low porosity at inlet is similar to that using the uniform electrode which is 66.6%. Lastly, we suggest an empirical equation for optimal local porosity distribution of the electrode according to current density. Using the empirical equation, we can increase the energy efficiency of the cell to 67.7% at 150 mA/cm<SUP>2</SUP>. This study shows the possibility of increase of the energy efficiency of VFBs by controlling local porosity of the electrode.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Control of local porosity of electrode in all-vanadium redox flow batteries. </LI> <LI> Effects of local porosity studied by electrochemical experiment and flow simulation. </LI> <LI> Less porous inlet area helps cell performance at high current density and flow rate. </LI> <LI> Increasing active area at inlet can improve the battery performance. </LI> </UL> </P>