JOURNAL OF POWER SOURCES
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2019
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IF 7.467
Xiaojing Zhi,Tian Gan,Nianjun Hou,Lijun Fan,Tongtong Yao,Jun Wang,Yicheng Zhao,Yongdan Li
Ni 1-x Zn x O-Ce 0.8 Sm 0.2 O 1.9 is studied as an anode material for solid oxide fuel cells with hydrogen and methanol as fuels. After reduction, Zn is incorporated into the lattice of Ni when x is less than 0.5, while NiZn alloy accompanied with ZnO is formed when x reaches 0.8. The electrochemical oxidation process of H 2 on the anode is investigated with a symmetric cell under various H 2 partial pressures. The addition of Zn increases the electron cloud density of Ni and thus weakens the adsorbing strength of H on Ni, accelerating the surface diffusion of H species, which is the rate determining step when the content of Zn is lower than 0.5. ZnO in the reduced Ni 0·2 Zn 0·8 O- Ce 0.8 Sm 0.2 O 1.9 anode facilitates H spillover, resulting in the variation of the rate determining step and the highest activity of the anode. The cell with Ni 0·2 Zn 0·8 O- Ce 0.8 Sm 0.2 O 1.9 anode shows the highest performance with both H 2 and methanol fuels at 700 °C. ZnO also improves coking resistance of NiO-Ce 0.8 Sm 0.2 O 1.9 anode.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Huan Li,Chaoxiang Su,Chaoqi Wang,Zhe Lü
In this work, we report FeCo 2 O 4 - x Ce 0.8 Sm 0.2 O 1.9 ( x = 0, 30, 40, 50, 60, 70 wt%), catalyst/electrolyte composite oxides , as cathode materials for application in solid oxide fuel cells. Herein a systematic investigation represents the effect of Ce 0.8 Sm 0.2 O 1.9 incorporation on physical and electrochemical properties . The obtained results indicate that the addition of Ce 0.8 Sm 0.2 O 1.9 to form FeCo 2 O 4 –Ce 0.8 Sm 0.2 O 1.9 composite material plays a key role in physical and electrochemical properties. Among all the components, the FeCo 2 O 4 –60Ce 0.8 Sm 0.2 O 1.9 composite cathode has the lowest polarization resistance of ∼0.094 Ω cm 2 at 800 °C in air, which is much smaller than that of the FeCo 2 O 4 cathode (4.18 Ω cm 2 ). In comparison with the FeCo 2 O 4 cathode, the FeCo 2 O 4 –60Ce 0.8 Sm 0.2 O 1.9 composite cathode has a better electrocatalytic activity and a larger power density of 397 mWcm −2 based an electrolyte-supported single-cell configuration at 800 °C. The oxygen partial pressure dependence studies indicate that rate limiting steps of the FeCo 2 O 4 –60Ce 0.8 Sm 0.2 O 1.9 composite cathode are the adsorption process of the molecular oxygen on the electrode surface and the charge-transfer process. In consequence of these superior properties, it is reasonable to believe that the FeCo 2 O 4 –60Ce 0.8 Sm 0.2 O 1.9 oxide has great potential to become a cathode material for solid oxide fuel cells.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
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IF 1.5
Changan Tian,Minzheng Zhu,Xiaoling Qu,Yang Liu,Cao Wang,Tusheng He,Chao Chen
The study investigates the impact of Bi 2 O 3 doping on the crystal structure, density, and ionic conductivity of Ce 0.8 Sm 0.2 O 1.9 , a type of samarium-doped ceria oxide (SDC). The material is intended for use as a solid electrolyte in intermediate temperature solid oxide fuel cells (IT-SOFCs). The SDC-based electrolyte was created using the auto-combustion technique, with various molar ratios of Bi 2 O 3 . Phase compositions, microstructure, and ionic conductivity of all ceria ceramics were analysed using XRD, SEM and impedance analyses, respectively. The language is formal, clear, objective, and value-neutral, using high-level, standard language with consistent technical terms. Grammar, spelling, and punctuation are correct. Consistent citation and footnote style are maintained. The samples are single-phase ceramics that crystallise into a cubic fluorite type structure with space group Fm-3 m, as confirmed by the X-ray diffraction pattern. Technical abbreviations are explained. The structure ensures a logical flow of information with causal connections between statements. No filler words or biased language are used. SDC/Bi 2 O 3 composite powders exhibit high sintering activity. The relative density of all samples sintered at 1300 ºC for 5 h was more than 96%, which is higher than that achieved by pure SDC electrolyte sintered at 1400 ºC (94.06%). Electrochemical performance results demonstrate that adding an appropriate amount of Bi 2 O 3 can significantly enhance the conductivity of SDC materials. The SDC-based electrolyte containing 9 mol% of Bi 2 O 3 (SDCB9) demonstrates the maximum conductivity of 43.5 mS·cm −1 at 800 °C, surpassing that of pure SDC which measures 26.86 mS·cm −1 .
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 16
·7792-7800
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IF 11.301
Tian Gan,Xinqiang Fan,Ye Liu,Chengyu Wang,Haoran Mei,Lijun Fan,Nianjun Hou,Yicheng Zhao,Yongdan Li
Ni/Ce0.8Sm0.2O1.9 (SDC) with a three-dimensionally ordered macroporous (3DOM) structure is prepared with poly(methyl methacrylate) as the template and characterized using X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, H2 temperature-programmed reduction, X-ray photoelectron spectroscopy and ultraviolet Raman spectroscopy. Lattice oxygen in 3DOM SDC shows a higher activity than that in hydrothermally synthesized bulk SDC. 3DOM SDC also exhibits a stronger interaction with Ni compared to bulk SDC, which facilitates the release of lattice oxygen and the formation of oxygen vacancies in SDC in a reducing atmosphere. Therefore, Ni/3DOM SDC shows a much higher catalytic activity for electrochemical oxidation than Ni/bulk SDC as the anode material of solid oxide fuel cells. With Ni/3DOM SDC as the anode, a cell supported by a 500 μm-thick SDC-carbonate composite electrolyte layer exhibits maximum power densities (Pmax) of 1.28 and 1.63 W cm−2 at 700 °C with H2 and methanol as fuels, respectively, more than twice the Pmax of a similar cell with a Ni/bulk SDC anode. The Ni/3DOM SDC anode also shows a high resistance to coking.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2018
·
IF 4.667
Tian Gan,Guochang Ding,Boran Chen,Xiaojing Zhi,Ping Li,Xueli Yao,Nianjun Hou,Lijun Fan,Yicheng Zhao,Yongdan Li
Ni-MnO x -Ce 0.8 Sm 0.2 O 1.9 (SDC) composites are synthesized and investigated as anode materials of solid oxide fuel cells fed with methanol. The lowest anodic polarization resistance is obtained when the molar ratio of Mn to Ni is 0.05:0.95. The high catalytic activity is attributed to the transfer of electrons from Ni to Mn and the increase of the content of the lattice oxygen in the anode. The single cell with that anode and SDC-carbonate composite electrolyte exhibits a maximum power density of 722 mW cm −2 at 700 °C. Mn also increases the resistance to carbon deposition of the anode due to the high lattice oxygen content and the redox cycle of the Mn species. The stability of the single cell is enhanced with the increase of the content of Mn in the anode.
研究领域:
能源材料
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电化学
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燃料电池技术
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催化
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材料科学
✓ 已验证
DOI
高影响因子
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