Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 34, Issue 12, Pages 2375-2383Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2018.04.011
Keywords
Solid oxide fuel cells; Carbon deposition; Cell regeneration; Carbon elimination; First-principle
Funding
- Ministry of Science and Technology, China [MOST 2017YFB0601901, 2017YFB0601903]
- Dongguan Science and Technology Bureau, Guangdong Project [201460720100025]
- Tsinghua University Initiative Scientific Research Program [2015THZ0]
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Carbon deposition is a primary concern during the operation of solid oxide fuel cells (SOFCs) fueled with hydrocarbon fuels, leading to cell degradation and even cell damage. Carbon elimination is expected to be a promising approach to prolong cell life. This work reports on a combined experimental and theoretical investigation of cell regeneration from anode carbon deposition of tubular SOFCs fabricated by phase-inversion and co-sintering techniques. The as-prepared cell exhibits a maximum power density of 0.20 W cm(-2) at 800 degrees C fueling with wet CH4, but fails to stable operation due to severe carbon deposition. Based on thermodynamic predictions, a successive cell-protecting regeneration process is proposed to eliminate deposited carbon without oxidizing Ni catalysts, during which CH4 and H-2 fuels are provided in circulation. Through a total of 35 cycling tests, cell performance can always successfully restore to the initial level. The possible carbon elimination mechanism is investigated in detail based on thermodynamic and first-principle calculations. The feasibility of carbon elimination using in situ produced oxygen or steam through electrochemical reaction has been revealed, providing a novel continuous operation mode for hydrocarbon-based SOFCs. (C) 2018 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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