INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Muhammad Akbar,Zhengwen Tu,Bin Jin,Naveed Mushtaq,Zili He,Wenjing Dong,Baoyuan Wang,Xunying Wang,Chen Xia
Nowadays, lowering the operating temperature of solid oxide fuel cells (SOFCs) is a major challenge towards their widespread application. This has triggered extensive material studies involving the research for new electrolytes and electrodes. Among these works, it has been shown that CeO 2 is not only a promising basis of solid oxide electrolytes, but also capable of serving as a catalytic assistant in anode. In the present work, to develop new electrolytes and electrodes for SOFCs based on these features of CeO 2 , a new type of functional composite is developed by introducing semiconductor CuO into CeO 2 . The prepared composites with mole ratios of 7:3 (7CeO 2 –3CuO) and 3:7 (3CeO 2 –7CuO) are assessed as electrolyte and anode in fuel cells, respectively. The cell based on 7CeO 2 –3CuO electrolyte reaches a power outputs of 845 mW cm −2 at 550 °C, superior to that of pure CeO 2 electrolyte fuel cell , while an Ce 0.8 Sm 0.2 O 2-δ electrolyte SOFC with 3CeO 2 –7CuO anode achieves high power density along with open circuit voltage of 1.05 V at 550 °C. In terms of polarization curve and AC impedance analysis, our investigation manifests the developed 7CeO 2 –3CuO composite has good electrolyte capability with a hybrid H + /O 2− conductivity of 0.1–0.137 S cm −1 at 500–550 °C, while the 3CeO 2 –7CuO composite plays a competent anode role with considerable catalytic activity , indicative of the dual-functionalities of CeO 2 –CuO in fuel cell. Furthermore, a bulk heterojunction effect based on CeO 2 /CuO pn junction is proposed to interpret the suppressed electrons in 7CeO 2 –3CuO electrolyte. Our study thus reveals the great potential of CeO 2 –CuO to develop functional materials for SOFCs to enable low-temperature operation.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
RENEWABLE ENERGY
·
2020
·
IF 6.274
Chaoqi Wang,Zhe Lü,Jingwei Li,Zhiqun Cao,Bo Wei,Huan Li,Minghao Shang,Chaoxiang Su
The rapid development of express logistics industry has yielded more carton wastes, how to utilize them as resources has become an important issue in recent years. In this paper, effective and multifunctional applications of waste carton are explored to obtain products of solid carbon fuel and tar via pyrolysis process . Solid carbon derived from waste carton is utilized as fuel for direct carbon solid oxide fuel cells (DC-SOFCs) with the symmetric perovskite La0.3Sr0.7Fe0.7Ti0.3O3-δ electrodes and scandium stabilized zirconia electrolyte for power generation . The maximum output performance of this DC-SOFC is up to 307.8 mW cm-2 at 850 °C. The cell fueled by 0.2 g carbonated waste carton is operated at constant resistance discharging mode of 20 Ω, and 5.8 h discharging with a capacity of 658 C is represented. Ash of the carton fuel is collected after operation. Infrared spectrum and surface-enhanced Raman spectrum are employed to characterize tar from pyrolysis, and they show that tar contains many organic matters with a potential to be used as chemical raw materials. Energy dispersive spectroscopy and X-ray diffraction results show various inorganic salts and oxides in the ash, it means that the ash may be a promising candidate for fertilizer.
研究领域:
环境科学
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能源工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ENERGY
·
2020
·
IF 8.848
Yu Chen,Minyi Lu,Huazheng Yang,Yingbang Yao,Tao Tao,Shengguo Lu,Chao Wang,Rajendran Ramesh,Michaela Kendall,Kevin Kendall,Xiaoping Ouyang,Bo Liang
High power density and simple design are vital for these fuel cell-based portable power generation devices. This study provides an 8.6 g tubular SOFC with embedded a catalytic partial oxidation reformer, which is fabricated and operated for more than 100 h using propane/air. Nickel-iron nanosheets, as catalysts for reforming, supported on α-Al 2 O 3 foam ceramic are synthesized by hydrothermal treatment. Testing for 80 h gives a power degradation of about 20% compared with the initial value. It is mainly attributed to sulfur-poisoning of nickel near anode/electrolyte interface according to transmission electron microscope (TEM) analysis. From TEM/energy dispersive spectroscopy line-scan results across the anode/electrolyte interface, sulfur as either aggregate at the nickel/yttria-stabilized zirconia grain boundaries or on the nickel grain surface, and no obvious carbon phase is founded. The maximum power density is 0.67 W cm −2 at 700 °C using propane/air (12 vol% propane), about 5% higher than the same cell using 20 vol% hydrogen.
研究领域:
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Jinghe Bai,Zhiying Han,Defeng Zhou,Xiaofei Zhu,Ning Wang,Ruyi Chen,Jing He,Wenfu Yan
As a Ruddlesden-Popper (RP) phase solid oxide fuel cell (SOFC) cathode material , Pr 2 NiO 4+δ (PNO) is a critical challenge for SOFC commercialization due to the lack of oxygen vacancies and insufficient redox reaction (ORR) activity. In this paper, various concentrations of La 0.6 Sr 0.4 CoO 3-δ (LSC) nanoparticles are coated on the surface of PNO by an impregnation method, and the ORR kinetics of PNO is found to be improved by constructing a composite cathode with heterointerfaces. The formation of the heterointerface effectively enhances the transfer of interstitial oxygen in the PNO and the oxygen vacancies in LSC, which can promote the conduction of O 2− in the cathode and thus improves the ORR activity of the material. When the impregnation concentration of LSC reached C LSC = 0.2 mol L −1 , the ORR activity can reach the highest level. At 700 °C, the area-specific resistance of PNO-LSC reaches 0.024 Ω cm 2 , which is 83.4% lower than that of PNO (0.145 Ω cm 2 ). And the peak power density of PNO-LSC reaches 0.618 W cm −2 , which is 1.89 times larger than that of PNO (0.327 W cm −2 ). Therefore, the construction of composite cathodes with heterointerfaces via impregnation provides an alternative strategy for enhancing the ORR activity of the cathode materials in SOFC.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2014
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IF 2.726
Qingjun Zhou,Tong Wei,Zepeng Li,Dongmin An,Xiaoqiang Tong,Zhaohui Ji,Weibo Wang,Hao Lu,Luyao Sun,Zhiyang Zhang,Ke Xu
The BaBi 0.05 Co 0.8 Nb 0.15 O 3− δ (BBCN) oxide has been synthesized by the traditional solid-state reaction method and characterized for its application as new cathode material for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The single phase BBCN having a cubic perovskite structure is obtained by Bi and Nb doping on the Co site in BaCoO 3− δ . The electrical conductivities of the BBCN sample are 8.8–12.5 S cm −1 in the temperature range 600–800 °C in air. The average thermal expansion coefficient (TEC) is 20.7 × 10 −6 K −1 in the range of 30–1000 °C in air. The activity of BBCN for oxygen reduction reaction (ORR) is tested by symmetrical cell and single fuel cell tests. The area specific resistance (ASR) of a BBCN cathode with LSGM electrolyte is 0.073 Ω cm 2 at 700 °C in air. A maximal power density of 610 mW cm −2 is achieved at 800 °C. The BBCN cathode has shown a good electrochemical stability for 24 h short-term cell test. The experimental results indicate that BBCN can be a promising cathode candidate for IT-SOFCs.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 6
·4457-4470
·
IF 4.186
Yuhao Xiang,Dan Zheng,Xiaomi Zhou,Hongdong Cai,Kai Wang,Chen Xia,Xunying Wang,Wenjing Dong,Hao Wang,Baoyuan Wang
The preparation of electrolyte with excellent ionic conduction is an important development direction in the practical application of solid oxide fuel cell (SOFC). Traditional methods to improve ion conduction was structure doping to develop electrolyte materials. In this work, the ionic conductor Ce 0.8 Sm 0.2 O 2-δ (SDC) was modified by insulator Al 2 O 3 to enhance ion conduction and apply as electrolytes for the SOFC. The transmission electron microscopy (TEM) characterization clearly clarified that a thin Al 2 O 3 layer in the amorphous state coated on SDC to form the SDC@Al 2 O 3 core−shell structure. The SDC@Al 2 O 3 electrolyte with the core−shell structure possesses a super ionic conductivity of 0.096 S cm −1 and results in advanced cell performance of 1190 mW cm −2 at 550°C. The X-ray photoelectron spectroscopy (XPS) analysis revealed that the concentration of oxygen vacancies in the SDC@Al 2 O 3 core–shell structure significantly improved in comparison with pure SDC, the newly produced oxygen vacancies can promote the oxygen ion transport. Moreover, the interface between SDC and Al 2 O 3 provides a fast channel for the proton transport. In addition, the SDC-based SOFC was usually suffered from the reduction of the SDC electrolyte and the accompanying generated electron conduction should deteriorate the cell performance, this is the main challenge for the SDC electrolyte application. In our case, the Al 2 O 3 shell on the SDC surface not only can avoid the contact between SDC and hydrogen to eliminate the reduction of SDC but also can restrain electron conduction due to the electron insulation characteristic of the Al 2 O 3 shell. This work demonstrates an efficient approach to develop the advanced low-temperature SOFC technology from material fundamentals.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Rui Guo,Dongdong Li,Rui Guan,Dechen Kong,Zheng Cui,Ziqi Zhou,Tianmin He
BaCeO3-based proton conductors have comparatively high-proton conductivity, but the low chemical stability and high sintering temperature seriously hinder their practical applications in protonic ceramic fuel cells. Herein, we demonstrate that this limitation can be conciliated by using a triple-doping strategy in a BaZr0.1Ce0.7Y0.2O3−δ (BZCY) electrolyte, where the triply doped BaCe0.7Sn0.1Dy0.15Cu0.05O3−δ (BCSDCu) exhibits better chemical stability and conductivity and lower sintering temperature compared with the pristine BZCY. The phase-pure BCSDCu can be obtained at the sintering temperature of 1100 °C prepared by solid-state reaction. The dense BCSDCu (>95%) is achieved at 1350 °C, which is significantly lower than the 1550 °C of BZCY. The BCSDCu presents competitive proton conductivity of 13.6 mS cm–1 under a moist H2 atmosphere at 600 °C. The anode-supported single cell with the BCSDCu (≈40 μm) as the electrolyte reaches the highest power density of 390 mW cm–2 at 600 °C. On the basis of the distribution of relaxation time analysis, we not only distinguish the contribution of grain and grain-boundary conductivities but also identify the rate-determining step of the single-cell performance. The protonic conductivities, mechanical properties, and impurity clean parts induced by grain size effects are discussed for the BCSDCu proton conductor.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2023
·Vol. 13
·期 6
·975
·
IF 2.7
Yiwang Dong,Muhammad Yousaf,Muhammad Ali Kamran Yousaf Shah,Muhammad Akbar,Yuzheng Lu,Lei Zhang,Qadeer Akbar Sial,Peng Cao,Changhong Deng
Semiconductor ionic electrolytes, especially heterostructure composites, have a significant role in enhancing oxide ion conductivity and peak power density (PPD) because of their interfacial contact. In this work, the fluorite structure CeO2and spinel-based CoAl2O4samples, as a heterostructure composite electrolyte, are successfully fabricated. The p-type CoAl2O4and n-type CeO2heterostructure (CeO2-CoAl2O4) used as an electrolyte exhibits a cell performance of 758 mW/cm2under fuel cell H2/air conditions at 550 °C, which is quite higher than the pure CoAl2O4and CeO2fuel cell devices. Scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HR-TEM) verified the heterostructure formation including the morphological analysis of the prepared heterostructure composite. The heterostructure-based CeO2-CoAl2O4composite achieved a higher ionic conductivity of 0.13 S/cm at 550 °C temperature, which means that the constructed device successfully works as an electrolyte by suppressing electronic conductivity. Meanwhile, the obtained results demonstrate the semiconductor ionic heterostructure effect by adjusting the appropriate composition to build heterostructure of the n-type (CeO2) and p-type (CoAl2O4) components and built-in electric field. So, this work exhibits that the constructed device can be effective for energy conversion and storage devices.Keywords:semiconductor ionics;heterostructure;p-n junction;spinel;SOFCs
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Tian Song,Tian Xia,Liping Sun,Qiang Li,Hui Zhao
Due to their great efficiency, low cost and pollution, and flexible fuel choice, solid oxide fuel cells (SOFCs) have been applied to energy conversion filed. However, one challenge for developing SOFCs is sluggish oxygen reduction reaction (ORR) rate. Herein, a series of Ruddlesden-Popper-type Sr 2.7 Pr 0.3 Fe 2– x Cu x O 7– δ (SPFC x ) oxides are successfully synthesized and thoroughly assessed as potential SOFCs cathodes. Among all compositions, Sr 2.7 Pr 0.3 Fe 1 · 9 Cu 0 · 1 O 7– δ (SPFC10) possesses the best electrocatalysis performance and improved oxygen reduction kinetics, with the lowest polarization resistance ( R p , 0.13 Ω cm 2 ) at 700 °C. Cu-doping will contribute to improving oxygen transport kinetics, increasing oxygen vacancy concentration, and O 2p band centers close to the Fermi level, hence, enhancing the electrocatalysis performance. At 700 °C, the maximum output of the single cell with SPFC10 cathode is 704 mW cm −2 . These results highlight a highly active SPFC10 cathode with Ruddlesden-Popper structure for SOFCs.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jinjin Zhang,Xuening Pang,Xinglong Zhou,Ruixue Xu,Yaning Du,Fangyong Yu,Jaka Sunarso,Xiuxia Meng,Naitao Yang
3D printing has revolutionized solid oxide fuel cell (SOFC) by introducing complicated structure and new functionalities that cannot be realized using traditional preparation process. This work provides guide and insights into the application of direct-writing 3D printing to fabricate the patterned electrolyte|electrode interface for the anode-supported SOFC using 3 mol % yttria-stabilized zirconia-nickel oxide (3YSZ-NiO) as the anode substrate material. The parameters that affected the shaping and performance of SOFC including the rheological properties of 3YSZ-NiO anode paste, the printing parameters, and the heat treatment process of the pre-sintered anode substrate were evaluated. The prepared 3YSZ-NiO paste exhibited a typical shear-thinning characteristic, “yielding” solid-like behavior, and time- and temperature-independent stability performance, which ensured the paste suitable for extrusion while allowing the shape of the printed body to be maintained after extrusion during the direct-writing printing process. The as-prepared anode paste, combined with the obtained values of 0.1 MPa, 100 mm s −1 , 100 rpm, and 0.3 mm for printing parameters of the extrusion pressure, the printing speed, the screw speed, and the nozzle diameter, respectively, as well as the devised heat treatment program for the pre-sintered 3YSZ-NiO anode substrate, successfully produced defect-free corrugated anode substrates. The cell made from the as-mentioned anode substrate showed an open circuit voltage of 1.02 V and a maximum power density of 619.44 mW cm −2 at 850 °C, which was comparable to the other identical cells fabricated by traditional and other 3D printing processes. Using the 3D printing process shown here, the preparation time of patterned anode substrate can be reduced and simplified.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Ke Xue,Changkun Cai,Manyi Xie,Shuting Li,Shengli An,Hong Yang
PrBaFe 2 O 5+ δ (PBF) is one of the promising cathode materials for intermediate-temperature solid oxide fuel cell (IT-SOFC) technology. However, as the operating temperature decreases, the electrochemical performance of this material deteriorates rapidly. To counter this, various doping strategies have been tested and reported in order to improve the electrochemical properties of this material at intermediate-temperatures. In this study, Mg-doping to partially substitute Fe of PBF was investigated. PrBaFe 2– x Mg x O 5+ δ (PBFMg x , x =0.1, 0.15, 0.2, 0.3) materials were successfully synthesized, and their electrochemical performance as IT-SOFC cathode was evaluated. It is shown that Mg-doping enhances the conductivity of PBF between 650–800 °C, impacts little on the area-specific resistance of oxygen reduction reaction at and above 700 °C, and, most significantly, improves the power density of the Ni-SDC/SDC/PBFMg 0.15 single cell by 52% compared to the un-doped PBF. This enhanced electrochemical performance is attributed to the improvement in PBF conductivity by Mg-doping.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2024
·
IF 3
Xinyu Feng,Hanzhen Liu,Zhenhang Lu,Xuanyu Lin,Xin Tang
The advancement of novel heterostructure electrolytes and the enhancement of solid oxide fuel cell (SOFC) performance represent a promising strategy for developing medium-temperature SOFCs. This study focuses on synthesizing CaSnO 3 via the sol-gel technique and fabricating CaSnO 3 -ZnO composites to serve as electrolytes for medium-temperature SOFCs. At 550 °C, the 2Ca 8Zn composite demonstrated an ionic conductivity of 0.204 S cm −1 , a peak power density of 700 mW cm −2 , and intermittent durability lasting up to 24 h under identical thermal conditions. Upon further investigation of the energy band structure, it has been revealed that CaSnO 3 -ZnO composites are promising candidates for serving as electrolytes in medium-temperature SOFCs. The findings indicate that the combination of calcium and zinc oxides can form n-n heterojunctions within the material, which enhance ionic conductivity by creating space charge regions, while simultaneously suppressing electronic conductivity. Consequently, CaSnO 3 -ZnO nanocomposites are anticipated to pave the way for advancements in intermediate-temperature solid oxide fuel cells.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）