J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (12): 2375-2383.DOI: 10.1016/j.jmst.2018.04.011
• Orginal Article • Previous Articles Next Articles
Zongying Hanabc, Zhibin Yanga, Minfang Hanab*()
Received:
2017-12-06
Revised:
2018-01-12
Accepted:
2018-01-29
Online:
2018-12-20
Published:
2018-11-15
Contact:
Han Minfang
Zongying Han, Zhibin Yang, Minfang Han. Cell-protecting regeneration from anode carbon deposition using in situ produced oxygen and steam: A combined experimental and theoretical study[J]. J. Mater. Sci. Technol., 2018, 34(12): 2375-2383.
Fig. 1. Cross-sectional microstructures of TZP supported tubular SOFCs: (a) whole cell; (b) TZP support; (c) Ni-YSZ anode functional layer; (d) YSZ electrolyte layer; (e) LSM-YSZ cathode functional layer; (f) LSM cathode current collector.
Fig. 4. Carbon elimination (a) and Ni oxidation (b) limit regions at 800?°C in C—H—O ternary diagram. The red dash line represents the as-calculated carbon deposition boundary without considering Ni oxidation.
Fig. 7. Comparison of cell performance (a) and electrochemical impedance spectra (b) of TZP supported tubular SOFC before carbon deposition and after carbon elimination. The electrochemical impedance spectra measurements were performed at open circuit voltage under CH4 fueling at 800?°C.
No. | Reaction | Reaction equation | ΔH (kJ?mol-1) | ΔG (kJ?mol-1) |
---|---|---|---|---|
1 | Carbon methanation | C?+?H2?=?CH4 | -89.45 | 27.14 |
2 | Carbon oxidation (full) | C?+?O2?=?CO2 | -394.75 | -395.94 |
3 | Carbon oxidation (partial) | C?+0·5O2?=?CO | -112.44 | -206.73 |
4 | Carbon gasification | C?+?H2O?=?CO?+?H2 | 135.77 | -18.04 |
5 | Reverse boudouard reaction | C?+?CO2?=?2CO | 169.88 | -17.53 |
Table 1 Possible carbon elimination reactions (The corresponding enthalpy changes (ΔH) and Gibbs free energy changes (ΔG) at 800?°C are calculated using HSC oftware).
No. | Reaction | Reaction equation | ΔH (kJ?mol-1) | ΔG (kJ?mol-1) |
---|---|---|---|---|
1 | Carbon methanation | C?+?H2?=?CH4 | -89.45 | 27.14 |
2 | Carbon oxidation (full) | C?+?O2?=?CO2 | -394.75 | -395.94 |
3 | Carbon oxidation (partial) | C?+0·5O2?=?CO | -112.44 | -206.73 |
4 | Carbon gasification | C?+?H2O?=?CO?+?H2 | 135.77 | -18.04 |
5 | Reverse boudouard reaction | C?+?CO2?=?2CO | 169.88 | -17.53 |
Species | This work | Previous study [ |
---|---|---|
OH | 0.20 | 0.22S |
H | 0.13 | 0.13 |
O | 0.51 | 0.50 |
C | 0.54 | 0.52 |
CH | 0.45 | 0.48 |
CO | 0.14 | 0.10 |
Table 2 Diffusion energy barriers (eV) of key intermediates on Ni (111) surface.
Species | This work | Previous study [ |
---|---|---|
OH | 0.20 | 0.22S |
H | 0.13 | 0.13 |
O | 0.51 | 0.50 |
C | 0.54 | 0.52 |
CH | 0.45 | 0.48 |
CO | 0.14 | 0.10 |
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