Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 46, Issue 44, Pages 22932-22941Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.04.121
Keywords
Solid oxide fuel cell; Infiltration; Cathode; Rate-limiting step
Categories
Funding
- Natural Science Foundation of Shandong Province [ZR2020KE033, ZR2020ME051, ZR2019BEM013]
- National Natural Science Foundation of China [51702189, 21908133]
- China Postdoctoral Science Foundation [2019M652442, 2019M652441]
- Shandong Postdoctoral Innovation Foundation [201903069]
- Shandong Province Higher Educational Science and Technology Program [J18KA002]
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By infiltrating ESB, the polarization resistances and activation energy of LSCF cathodes were significantly reduced, improving the oxygen reduction reaction process and enhancing the performance of intermediate-temperature solid oxide fuel cells.
Aiming to lower the activation energy and expedite the oxygen reduction reaction (ORR) process of La0.6Sr0.4Co0.2Fe0.8O3-d (LSCF) cathodes for application in intermediatetemperature solid oxide fuel cells (IT-SOFCs), Er0.4Bi1.6O3 (ESB) modified LSCF was prepared by infiltrating using organic solvents. The infiltration of ESB dramatically reduces the polarization resistances of LSCF cathodes (from 0.27 to 0.11 U cm2 at 700 degrees C, from 0.58 to 0.25 U cm2 at 650 degrees C), and lowers their activation energy (from 100.28 to 97.15 kJ mol-1). Also, ESB makes the rate-limiting step of LSCF cathodes at high frequency change from the charge transfer process on the cathode to the adsorption and diffusion of oxygen on cathode surface. The single cell with ESB infiltrated LSCF cathodes shows a peak power density of 469 mW cm-2 at 700 degrees C using humid hydrogen and air as fuels and oxidants, respectively, as well as a good short-term stability for 50 h. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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