An Efficient Trifunctional Spinel-Based Electrode for Oxygen Reduction/Evolution Reactions and Nonoxidative Ethane Dehydrogenation on Protonic Ceramic Electrochemical Cells.
basic_science · Level V
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- Also identified by DOI 10.1002/adma.202408044.
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Abstract
Protonic ceramic electrochemical cells (PCECs) have received considerable attention as they can directly generate electricity and/or produce chemicals. Development of the electrodes with the trifunctionalities of oxygen reduction/evolution and nonoxidative ethane dehydrogenation is yet challenging. Here these findings are reported in the design of trifunctional electrodes for PCECs with a detailed composition of Mn<sub>0.9</sub>Cs<sub>0.1</sub>Co<sub>2</sub>O<sub>4-δ</sub> (MCCO) and Co<sub>3</sub>O<sub>4</sub> (CO) (MCCO-CO, 8:2 mass ratio). At 600 °C, the MCCO-CO electrode exhibits a low area-specific resistance of 0.382 Ω cm<sup>2</sup> and reasonable stability for ≈105 h with no obvious degradation. The single cell with the MCCO-CO electrode shows an encouraging peak power density of 1.73 W cm<sup>-2</sup> in the fuel cell (FC) mode and a current density of -3.93 A cm<sup>-2</sup> at 1.3 V in the electrolysis cell (EC) mode at 700 °C. Moreover, the MCCO-CO cell displays promising operational stability in FC mode (223 h), EC mode (209 h), and reversible cycling stability (52 cycles, 208 h) at 650 °C. The MCCO-CO single cell shows an encouraging ethane conversion to ethylene (with a conversion of 40.3% and selectivity of 94%) and excellent H<sub>2</sub> production rates of 4.65 mL min<sup>-1</sup> cm<sup>-2</sup> at 1.5 V and 700 °C, respectively, with reasonable Faradaic efficiencies.