Affiliation:
1. School of Environment and Energy South China University of Technology Guangzhou 510006 China
2. Research Institute of Renewable Energy and Advanced Materials Zijin Mining Group Co., Ltd. Xiamen Fujian 361101 China
Abstract
AbstractProtonic 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 Mn0.9Cs0.1Co2O4‐δ (MCCO) and Co3O4 (CO) (MCCO–CO, 8:2 mass ratio). At 600 °C, the MCCO–CO electrode exhibits a low area‐specific resistance of 0.382 Ω cm2 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−2 in the fuel cell (FC) mode and a current density of ‐3.93 A cm−2 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 H2 production rates of 4.65 mL min−1 cm−2 at 1.5 V and 700 °C, respectively, with reasonable Faradaic efficiencies.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Basic and Applied Basic Research Foundation of Guangdong Province