| 1. |
- Fan, Liangdong, 1985-, et al.
(författare)
-
High performance transition metal oxide composite cathode for low temperature solid oxide fuel cells
- 2012
-
Ingår i: Journal of Power Sources. - : Elsevier BV. - 0378-7753 .- 1873-2755. ; 203:1, s. 65-71
-
Tidskriftsartikel (refereegranskat)abstract
- Low temperature solid oxide fuel cells (SOFCs) with metal oxide composite cathode on the ceria–carbonate composite electrolyte have shown promising performance. However, the role of individual elements or compound is seldom investigated. We report here the effect of the ZnO on the physico-chemical and electrochemical properties of lithiated NiO cathode. The materials and single cells are characterized by X-ray diffraction, scanning electron microscopy, DC polarization electrical conductivity, electrochemical impedance spectroscopy and fuel cell performance. The ZnO modified lithiated NiO composite materials exhibit smaller particle size and lower electrical conductivity than lithiated NiO. However, improved electro-catalytic oxygen reduction activity and power output are achieved after the ZnO modification. A maximum power density of 808 mW cm−2 and the corresponding interfacial polarization resistance of 0.22 Ω cm2 are obtained at 550 °C using ZnO modified cathode and 300 μm thick composite electrolyte. The single cell keeps reasonable stability over 300 min at 500 °C. Thus, ZnO modified lithiated NiO is a promising cathode candidate for low temperature SOFCs.
|
|
| 2. |
- Fan, Liangdong, et al.
(författare)
-
Low temperature ceramic fuel cells using all nano-composite materials
- 2011
-
Ingår i: EFC 2011 - Proceedings of the 4th European Fuel Cell Piero Lunghi Conference and Exhibition. - 9788882862541 ; , s. 175-176
-
Konferensbidrag (refereegranskat)abstract
- Nano-structural components have attracted increasing attention in intermediate/low temperature ceramic fuel cell. We reported here a ceramic fuel cell with a configuration of (Ni/Fe)-NSDC/NSDC/LiNiZnO-NSDC by all nano-composite materials and operated at low temperature range of 500-600°C. The prepared nanocomposite materials are characterized by X-ray diffraction (XRD), Emission scanning electron microscopy (SEM) and Transmission electron microscopy (TEM). Electrochemical performances were studied by current -Voltage, power density characteristics and Ac impedance spectroscopy. The short term stability of fuel cell was also investigated in 100 min. The high fuel cell performance and reasonable stability demonstrated that the all nanocomposite fuel cell concept is feasible and may have great potential in future study.
|
|
| 3. |
|
|
| 4. |
- Fan, Liangdong, et al.
(författare)
-
Mixed ion and electron conductive composites for single component fuel cells : I. Effects of composition and pellet thickness
- 2012
-
Ingår i: Journal of Power Sources. - : Elsevier BV. - 0378-7753 .- 1873-2755. ; 217, s. 164-169
-
Tidskriftsartikel (refereegranskat)abstract
- Electrochemical performances of single component fuel cells (SCFCs) based on mixed ion and electron conductors have been studied as a function of composition and pellet thickness by polarization curves and electrochemical impedance spectroscopy. The electronic conductor of LNCZO shows conductivities of 21.7 and 5.3 S cm(-1) in H-2 and in air, respectively. SCFC using 40 wt. % of LNCZO and 60 wt. % of ion conductive SDC-Na2CO3 with a thickness of 1.10 mm shows the highest power density of 0.35 W cm(-2) at 550 degrees C. The performance is correlated to the mixed conduction properties (ionic and electronic, p and n-type) and the microstructure of the functional SCFC layer.
|
|
| 5. |
- Hu, Enyi, et al.
(författare)
-
Junction and energy band on novel semiconductor-based fuel cells
- 2021
-
Ingår i: iScience. - : Elsevier BV. - 2589-0042. ; 24:3
-
Forskningsöversikt (refereegranskat)abstract
- Fuel cells are highly efficient and green power sources. The typical membrane electrode assembly is necessary for common electrochemical devices. Recent research and development in solid oxide fuel cells have opened up many new opportunities based on the semiconductor or its heterostructure materials. Semiconductor-based fuel cells (SBFCs) realize the fuel cell functionality in a much more straightforward way. This work aims to discuss new strategies and scientific principles of SBFCs by reviewing various novel junction types/interfaces, i.e., bulk and planar p-n junction, Schottky junction, and n-i type interface contact. New designing methodologies of SBFCs from energy band/alignment and built-in electric field (BIEF), which block the internal electronic transport while assisting interfacial superionic transport and subsequently enhance device performance, are comprehensively reviewed. This work highlights the recent advances of SBFCs and provides new methodology and understanding with significant importance for both fundamental and applied R&D on new-generation fuel cell materials and technologies.
|
|
| 6. |
- Lima, Raquel B., et al.
(författare)
-
Direct lignin fuel cell for power generation
- 2011
-
Ingår i: 16th International Symposium on Wood, Fiber and Pulping Chemistry. ; , s. 257-262
-
Konferensbidrag (refereegranskat)abstract
- Lignin, the second most abundant component after cellulose in biomass, has been examined in this study as a fuel for a direct conversion into electricity using direct carbon fuel cell (DCFC). Two different types of industrial lignins were investigated: lignosulphonate (LS) and kraft lignin (KL), either directly in their commercial forms, after their blending with commercial active carbon (AC) or after alternation of their structures by a pH adjustment to pH 10. It has been found that the open circuit voltage (OCV) of the DCFC could reach around 0.7 V in most of the trials. Addition of active carbon increased the maximum current density from 43∼57 to 85∼101 mA/cm 2. The pH adjustment not only increased the maximum current density but also reduced the differences between the two types of lignins, resulting in an OCV of 0.680-0.699 V and a maximum current density of 74∼79 mA/cm 2 from both lignins. Typical power density was 12 (for KL +AC) and 24 mW cm -2 (for LS +AC). It has been concluded that a direct lignin fuel cell is feasible and the lignin hydrophilicity is critical for the cell performance.
|
|
| 7. |
- Liu, Qinghua, et al.
(författare)
-
Advanced electrolyte-free fuel cells based on functional nanocomposites of a single porous component : analysis, modeling and validation
- 2012
-
Ingår i: RSC Advances. - : Royal Society of Chemistry (RSC). - 2046-2069. ; 2:21, s. 8036-8040
-
Tidskriftsartikel (refereegranskat)abstract
- Recently, a fuel cell device constructed with only one layer composited of ceria-based nanocomposites (typically, lithium nickel oxide and gadolinium doped ceria (LiNiO2-GDC) composite materials), called an electrolyte-free fuel cell (EFFC), was realized for energy conversion by Zhu et al. The maxium power density of this single-component fuel cell is 450 mW cm(-2) at 550 degrees C when using hydrogen fuel. In this study, a model was developed to evaluate the performance of an EFFC. The kinetics of anodic and cathodic reactions were modeled based on electrochemical impedance spectroscopy (EIS) measurements. The results show that both of the anodic and cathodic reactions are kinetically fast processes at 500 degrees C. Safety issues of an EFFC using oxidant and fuels at the same time without a gas-tight separator were analyzed under open circuit and normal operation states, respectively. The reaction depth of anodic and cathodic processes dominated the competition between surface electrochemical and gas-phase reactions which were effected by the catalytic activity and porosity of the materials. The voltage and power output of an EFFC were calculated based on the model and compared with the experimental results.
|
|
| 8. |
- Qin, Haiying, et al.
(författare)
-
Integration design of membrane electrode assemblies in low temperature solid oxide fuel cell
- 2012
-
Ingår i: International journal of hydrogen energy. - : Elsevier BV. - 0360-3199 .- 1879-3487. ; 37:24, s. 19365-19370
-
Tidskriftsartikel (refereegranskat)abstract
- In this paper, an integration design of membrane electrode assemblies in low temperature solid oxide fuel cells (LTSOFCs) is accomplished by using a mixed ionic-electronic conductor. The mixed ionic-electronic conductor is a composite material, LiNiCuZn oxides, Gd2O3 and Sm-doped CeO2 composited with Na2CO3 (LiNiCuZn oxides-NGSDC), which consists of ionic conductor, n-type and p-type semiconductors. The multi-phase composite material can also be used in single layer fuel cell (SLFC) to replace single-phase materials. A SLFC using the LiNiCuZn oxides-NSGDC composite exhibits an OCV of 1.05 V and maximum power density of 800 mW cm-2, which is comparable to the cell performance of conventional LTSOFCs and much higher than that of SLFC reported before. The reasons leading to the good performance are porous structure of electrode and the matching of ionic conductor and semiconductor.
|
|
| 9. |
- Raza, Rizwan, et al.
(författare)
-
Electrochemical study on co-doped ceria-carbonate composite electrolyte
- 2012
-
Ingår i: Journal of Power Sources. - : Elsevier BV. - 0378-7753 .- 1873-2755. ; 201, s. 121-127
-
Tidskriftsartikel (refereegranskat)abstract
- A co-doped ceria-carbonate (Ce0.8Sm0.2-xCaxO2-delta-Na2CO3) has been synthesized by a co-precipitation method. The detailed electrochemical characterizations (e.g. impedance spectra, polarization curve and IV curves) of this composite material are reported and discussed. The two phase nanocomposite electrolytes with carbonate coated on the co-doped ceria displays dual (H+/O2-) ion conduction at low temperature (300-600 degrees C) in solid oxide fuel cell. The observed remarkable temperature-dependent of conductivity is attributed to the softening/melting of carbonate phase as the physical state of carbonate phase transforms from solid to molten state. Coexistence of various charge carriers, oxide phase composition, and the oxide-carbonate interfacial area are investigated by Raman spectra. The enhancement of conductivity is also discussed by the general mixing rule/percolation theory of composite interfaces. The co-doping with 2nd phase gives a good approach to realize challenges for solid oxide fuel cell.
|
|
| 10. |
- Singh, M., et al.
(författare)
-
Single component low-temperature fuel cell with alcohol fuel
- 2011
-
Ingår i: EFC 2011 - Proceedings of the 4th European Fuel Cell Piero Lunghi Conference and Exhibition. - 9788882862541 ; , s. 211-212
-
Konferensbidrag (refereegranskat)abstract
- Following our previous study, we report here novel preparation of the low temperature single component fuel cell and related materials and performance using methanol as fuel for the first time. A maximum power density of 206 mW/cm2 was achieved at 550 °C, indicating the feasibility of direct liquid fed single component fuel cells.
|
|
