Fig. 5: Unraveling the oxygen behavior, carbon oxidation and electrode potentials in the RZABs. | Nature Communications

Fig. 5: Unraveling the oxygen behavior, carbon oxidation and electrode potentials in the RZABs.

From: Understanding the active site in chameleon-like bifunctional catalyst for practical rechargeable zinc-air batteries

Fig. 5

a Schematic illustration of techniques to reveal the oxygen bubbles, carbon corrosion and potential fluctuation on the air cathode. b The released to theoretical oxygen ratio of RuSA-NiFe LDH HE and traditional RuSA-NiFe LDH air cathode were measured by gas chromatography. c The inorganic and organic carbon contents of pristine electrolytes and the electrolytes with different air cathodes after cycling at 10 mA cm−2 for 200 h, the high purity oxygen was used as the oxygen source. d The corrosion depth distribution evolution at the cathode surface upon charging. e The concentration of corrosion product evolution in the electrolyte during the charging process. f, g SEM images of the hydrophobic layer in RuSA-NiFe LDH HE (f) and traditional RuSA-NiFe LDH air cathode (g) after cycled in the batteries for 2000 h. For the SEM test, the hydrophobic layer and hydrophilic layer are close together instead of rolling together. h The fluctuation of cathode and anode potentials during discharge and cathode with a Hg/HgO electrode as the reference electrode. i Comparison of cathode potentials of RuSA-NiFe LDH HE and traditional RuSA-NiFe LDH air cathode at various charge current densities. Inset is the cathode charge potential differences between RuSA-NiFe LDH HE and traditional RuSA-NiFe LDH air cathode.

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