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Journal of Materials Chemistry A
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more than 50 hours (Figure. 9b) is achieved without observable Science Center CAS (2016HSC-IU004), and the Fundamental
degradation in performance, demonstrating its good carbon Research Funds for the Central UniversitiDesO(I:W10K.1304309/0C090T0A00740)27C
tolerance. When measured in humid syngas and syngas with 50 ppm
H2S, the cells have achieved high performance of 520 and 498
mW·cm-2 (Figure. 9a), respectively, and the polarization resistances
of the cells are almost the same of 0.035 Ω·cm2 (Figure. S7), slightly
larger than that in humid H2 (0.028 Ω·cm2). Such low polarization
resistances greatly suggest the effectiveness of the anode toward
syngas oxidation and especially the high sulphur tolerance. Yet, a
slightly higher ohmic resistance in wet syngas-H2S is observed than
that in wet syngas (Figure. S7), which may be attributed to the trace
amount of sulfide (Ce2S3) on SDC particles as shown in the Figure. S9.
Notably, the cell reaches a long-term stability for 100 h at 750 °C in
wet syngas with 50 ppm H2S as shown in Figure. 9 c without obvious
degradation. In contrast, a continuous decrease rates of 6 mV h−1 in
cell voltage is observed when NiO-SDC anode is exposed to the same
fuel, indicating PBFMNi0.3 anode exhibits much better coking
resistance and sulfur tolerance than conventional NiO-SDC anode in
intermediate temperatures. After durability test in syngas with 50
ppm H2S, the microstructure of the porous PBFMNi0.3-SDC was
examined and no carbon or carbon fibres can be observed (Figure.
S10).
Notes and references
1
2
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4. Conclusions
In summary, we have explored a series of (PrBa)0.95Fe1.9-xNixMo0.1O6-
δ (PBFMNix, x=0, 0.1, 0.2, 0.3) oxide anodes in IT-SOFCs. Firstly, pure
perovskite phase PBFMNi0.3 can be synthesized in air without
BaMoO4 impurity and FeNi3 alloy nano-particles were uniformly
dispersed on the oxide surface under reducing atmosphere.
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Secondly, PBFMNi0.3 anode shown the biggest surface exchange
-4
coefficient of 3.25 10 cm·s-1 and the best electrochemical
×
properties at 700 °C compared with PBFMNi0.1 and PBFMNi0.2,
indicating that Ni-doping is beneficial to increase the catalytic activity
of anode materials. Furthermore, electrolyte supported single cells
with PBFMNi0.3 anode achieved very small polarization resistances
of 0.028 Ω·cm2 at 750 °C and the cells’ peak power densities have
reached 588, 520, 498 mW·cm-2 in wet H2, wet syngas and syngas
with 50 ppm H2S at 750 °C respectively. Moreover, the cells have kept
long-term stability for 50 hours in wet propane and for 100 hours in
wet syngas with 50 ppm H2S at 750 °C, which suggests the excellent
coking resistance and sulfur tolerance of the PBFMNi0.3-SDC fuel
electrode in IT-SOFCs.
Conflicts of interest
There are no conflicts to declare.
Acknowledgements
27 C. Yang, Z. Yang, C. Jin, G. Xiao, F. Chen and M. Han,
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This work was financially supported by the National Key 28 F. Liu, L. Zhang, G. Huang, B. Niu, X. Li, L. Wang, J. Zhao and Y.
Jin, Electrochim. Acta, 2017, 255, 118-126.
29 M. Li, Y. Ren, Z. Zhu, S. Zhu, F. Chen, Y. Zhang and C. Xia,
Electrochim. Acta, 2016, 191, 651-660.
Research
and
Development
Program
of
China
(2017YFA0402800), the Natural Science Foundation of China
(51872276), the External Cooperation Program of BIC, the
Chinese Academy of Science (211134KYSB20130017), Hefei
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