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Tests in a home‐made cell composed of a working electrode (α‐MnO2), counter electrode (Zn) and electrolyte without separator. a) Schematic diagram of the cell. b) Galvanostatic discharge and charge curves in 2 m ZnSO4 and 2 m ZnSO4+0.2 m MnSO4. c) In situ potential monitoring. d) In situ pH monitoring.
