Fig. 6: Reversible operation and analysis in hydrogen and power generation. | Nature Communications

Fig. 6: Reversible operation and analysis in hydrogen and power generation.

From: Self-sustainable protonic ceramic electrochemical cells using a triple conducting electrode for hydrogen and power production

Fig. 6

The cycling reversible operation of the electrochemical cell between electrolysis mode (hydrogen production) and fuel cell mode (electricity generation) at different current densities to examine the capability of converting hydrogen generated by electrolysis into electricity. a Reversible operation with external hydrogen supply: current density responses as working mode transiently changing between electrolysis and fuel cell at 500 °C. b Schematic of self-sustainable reversible operation without external hydrogen feeding. c Voltage observation under switchable electrolysis and fuel cell current densities at 500 °C. d Average hydrogen production based on results on current density and Faradaic efficiency and hydrogen yield assuming the cell is operated for 24 h. e Average electricity generation rate and electricity yield in 24 h.

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