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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-δ (BSFSb) and fluorite structure Sm0.2Ce0.8O2-δ (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 °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.
|Number of pages||10|
|Journal||Applied Catalysis B: Environmental|
|Publication status||Published - 5 Dec 2021|
|MoE publication type||A1 Journal article-refereed|
- BaSrFeSbOδ-SmCeO-δ (BSFSb-SDC)
- Built-in-electric field (BIEF)
- Charge and mass transport
- Ionic transport
FingerprintDive into the research topics of 'Promoted electrocatalytic activity and ionic transport simultaneously in dual functional Ba0.5Sr0.5Fe0.8Sb0.2O3-δ-Sm0.2Ce0.8O2-δ heterostructure'. Together they form a unique fingerprint.
- 1 Finished
Leading-edge next generation fuel cell devices
01/09/2019 → 31/08/2022
Project: Academy of Finland: Other research funding