Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 298, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2021.120503
Keywords
Heterostructure; Semiconductor-ionic; Ba0.5Sr0.5Fe0.8Sb0.2O3-delta-Sm0.2Ce0.8O2-delta (BSFSb-SDC); Charge and mass transport; Built-in-electric field (BIEF); Ionic transport
Funding
- National Natural Science Foundation of China (NSFC) [51772080, 12004103, 11604088]
- Southeast University (SEU PROJET) [3203002003A1]
- Foundation of Nanjing Xiaozhuang University [2020NXY12]
- Hubei Overseas Talent 100 program
- Academy of Finland [13329016, 13322738]
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A novel approach to develop materials with fast ionic conduction and high electrocatalytic activity through a semiconductor-ionic heterostructure of BSFSb and SDC has been reported, showing remarkable fuel cell performance at 550 degrees C. It was found that the BSFSb-SDC heterostructure has enhanced ionic transport and electrocatalytic activity simultaneously, providing new insights for designing functional materials for energy conversion and storage devices.
Structural doping is often used to prepare materials with high oxygen-ion conductivity and electrocatalytic function, but its wider application in solid oxide fuel cells (SOFCs) is still a major challenge. Here, a novel approach to developing materials with fast ionic conduction and high electrocatalytic activity is reported. A semiconductor-ionic heterostructure of perovskite Ba0.5Sr0.5Fe0.8Sb0.2O3-delta (BSFSb) and fluorite structure Sm0.2Ce0.8O2-delta (SDC) is developed. The BSFSb-SDC heterostructure exhibits a high ionic conductivity >0.1 S cm(-1) (vs 0.01 S cm(-1) of SDC) and achieves a remarkable fuel cell performance (>1000 mWcm(-2)) at 550 degrees C. It was found that the BSFSb-SDC has both electrolyte and electrode (cathode) functions with enhanced ionic transport and electrocatalytic activity simultaneously. When using BSFSb-SDC as an electrolyte, the interface energy-band reconstruction and charge transfer at particle level forming a built-in electric field (BIEF) and it make electronic confinement. The BIEF originates from the potential gradient due to differences in the electron density of BSFSb and SDC particles/grains facilitates ionic conduction at the interface of the BSFSb and SDC particles. This work provides a new insight in designing functional materials with high ionic conductivity and electrocatalytic function, which can be used both for energy conversion and storage device.
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