Study of Loss Mechanisms in a Regenerative Hydrogen Vanadium Fuel Cell
But there remains scope to reduce the cost and improve the performance of current systems, and in this context a novel regenerative fuel cell, utilising an aqueous vanadium electrolyte and hydrogen gas has recently been reported1. The advantages offered by this approach are fast hydrogen kinetics, use of half of vanadium electrolyte in comparison to the conventional all vanadium flow battery and the absence of cross-contamination between the positive and negative half-cells.
The first generation of this vanadium-hydrogen cell assembled with commercial MEAs demonstrated a maximum power density of 107 mW/cm2 in a 1M V(IV)/V(V) solution. In this work we report improved performance to achieve a maximum power density of 229 mW/cm2 through cell design modification. Half-cell measurements have been used to gain a better understanding of the loss mechanisms in the cathode and anode. Additionally, the authors have implemented the use of 3D tomography to study the structural changes of carbon based electrodes over different numbers of experimental conditions (Figure 1). The latest results from these studies will be presented.
1 V. Yufit, B. Hale, M. Matian, P. Mazur and N.P. Brandon, Development of a Regenerative Hydrogen-Vanadium Fuel Cell for energy storage applications, Journal of The Electrochemical Society, 160 (2013), A856-A861.