Neutralization of acid and base to produce electricity in the process of reverse electrodialysis with bipolar membranes (REDBP) presents an interesting but until now fairly overlooked flow battery concept. Previously, we presented single-cell experiments, which explain the principle and discuss the potential of this process. In this contribution, we discuss experiments with REDBP stacks at lab scale, consisting of 5 to 20 repeating cell units. They demonstrate that the single-cell results can be extrapolated to respective stacks, although additional losses have to be considered. As in other flow battery stacks, losses by shunt currents through the parallel electrolyte feed/exit lines increases with the number of connected cell units, whereas the relative importance of electrode losses decreases with increasing cell number. Experimental results are presented with 1 mole L−1 acid (HCl) and base (NaOH) for open circuit as well as for charge and discharge with up to 18 mA/cm2 current density. Measures to further increase the efficiency of this novel flow battery concept are discussed.
One theoretical advantage of High Temperature Polymer-Electrolyte Fuel Cells (HT-PEFC) is the higher kinetic of the anode and cathode reaction. Whereas on the anode side the higher kinetic can be achieved practically, the kinetic on the cathode side is in practice lower than in low temperature PEFCs. In this paper different kind of electrode compositions for anode and cathode are prepared to improve the interface between an acid-base blend membrane (Polybenzimidazol-sulfonated Polysulfon) in respect to the cathode kinetic and the ohmic resistance of the Membrane-Electrode-Assembly (MEA).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.