Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 51, Pages 35308-35314Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b12157
Keywords
solid oxide fuel cell; cathode; oxygen reduction reaction; nickel nanoparticle; surface modification
Funding
- Major Project of Educational Commission of Jiangsu Province of China [13KJA430004]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Changjiang Scholars Program [T2011170]
- CAS Interdisciplinary Innovation Team
- Innovation Project of Graduate Research by Jiangsu Province [ICYLX15-0788]
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The successful development of low-cost, durable electrocatalysts for oxygen reduction reaction (ORR) at intermediate temperatures is critical for broad commercialization of solid oxide fuel cells. Here, we report our findings in design, fabrication, and characterization of a cobalt-free SrFe(0.8)5Ti(0.1)Ni(0.05)O(3-delta) cathode decorated with NiO nanoparticles. Exsolved from and well bonded to the parent electrode under well-controlled conditions, the NiO nanoparticles uniformly distributed on the surface of the parent electrode greatly enhance cathode performance, demonstrating ORR activity better than that of the benchmark cobalt-based Ba0.5Sr0.5Co0.8Fe0.2O3-delta. Further, a process for regeneration of the NiO nanoparticles was also developed to mitigate potential performance degradation due to coarsening of NiO particles under practical operating conditions. As a general approach, this exsolution dissolution of electrocatalytically active nanoparticles on an electrode surface may be applicable to the development of other high-performance cobalt-free cathodes for fuel cells and other electrochemical systems.
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