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Appendix B PROBLEMS ENCOUNTERED DURING CELL OPERATION After assembling the cell but before obtaining performance data, three major problems were encountered. Each problem and its solution is described below. B.1 Electrolyte Discoloration To prepare for electrolyte charging, equal volumes of V(IV) are placed on either side of the cell. After charging, the V(III) and V(V) solutions are supposed to be green and yellow respectively. However, after charging for several minutes the solutions became dark and either black or red in shade. This phenomenon was unexpected and could not be found anywhere in the literature. Initially, contamination of the electrolytes was suspected. However, it was discovered that further charging of the solutions eventually yielded distinctly green and yellow solutions. In a partially charged solution, vanadium ions of multiple valences exist. The darkening of the electrolytes was probably due to the fact that a mixed-valence solution will absorb light waves over a greater wavelength spectrum than a single-valence vanadium solution. Figure B.1: Discolored Electrolyte. 31PDF Image | PERFORMANCE EVALUATION OF A REDOX FLOW BATTERY
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