Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 41, Pages 35047-35059Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b10429
Keywords
proton ceramics fuel cells; mixed conductivities; charge-transfer model; relaxation time distribution; cathodic reaction
Funding
- Key Laboratory of Coal-based CO2 Capture and Geological Storage, Jiangsu Province [B2016B07]
- National Natural Science Foundation of China [51602343]
- Natural Science Foundation of Jiangsu Province [BK20160271]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT17R103]
- Program of Introducing Talents of Discipline to Universities [B17041]
- Program for Innovation Research Team of CUMT [2015QN004]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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A charge-transfer model considering the mixed conductivities of proton, oxygen ion, and free electron in interface-modified La2Ce2O7 (LCO) electrolyte is designed to analyze the characteristics of proton ceramics fuel cell in the field of the open-circuit voltage, internal short-circuit current, proton-transfer number, discharging curves, oxygen/hydrogen partial pressure, and cell efficiencies. The properties of anode-supported single cells with the modified anode-electrolyte interface containing an in situ formed doped BaCeO3 reaction layer are compared to those of unmodified cells at various temperatures T and H2O partial pressures. Besides, the electrochemical impedance spectroscopies of both cells were investigated by the relaxation time distribution to distinguish different polarization processes. The results indicated that the reaction interface layer can effectively reduce the internal short-circuit current density and increase the proton-transfer number of electrolytes. Importantly, the NiO-BaZr0.1Ce0.7Y0.2O3-delta anode can also make more protons transfer from anode to cathode and participate in the cathodic reaction for LCO-based proton ceramics fuel cell. The polarization of the cell decreases with the increase of water partial pressure, which leads to the increase of open-circuit voltage and cell efficiency.
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