Materials
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2018
·Vol. 11
·期 9
·1549
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IF 2.467
Zhaoqing Wang,Xunying Wang,Zhaoyun Xu,Hui Deng,Wenjing Dong,Baoyuan Wang,Chu Feng,Xueqi Liu,Hao Wang
A novel composite was synthesized by mixing La0.1Sr0.9MnO3−δ(LSM) with Ce0.8Sm0.2O2−δ(SDC) for the functional layer of low temperature solid oxide fuel cell (LT-SOFC). Though LSM, a highly electronic conducting semiconductor, was used in the functional layer, the fuel cell device could reach OCVs higher than 1.0 V without short-circuit problem. A typical diode or rectification effect was observed when an external electric force was supplied on the device under fuel cell atmosphere, which indicated the existence of a junction that prevented the device from short-circuit problem. The optimum ratio of LSM:SDC = 1:2 was found for the LT-SOFC to reach the highest power density of 742 mW·cm−2under 550 °C The electrochemical impedance spectroscopy data highlighted that introducing LSM into SDC electrolyte layer not only decreased charge-transfer resistances from 0.66 Ω·cm2for SDC to 0.47–0.49 Ω·cm2for LSM-SDC composite, but also decreased the activation energy of ionic conduction from 0.55 to 0.20 eV.Keywords:LT-SOFC;LSM (La0.1Sr0.9MnO3−δ);hetero-interface;semiconductor-ionic nanocomposite;junction
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Xin Zhao,Wen Liu,Jian Zhang,Xuanlin Lu,Jiaxuan Chen,Tianqi Shao,Jinpeng Zhang,Yicheng Zhao,Yongdan Li
Rational design of the electrode microstructure is an important strategy to improve the performance of solid oxide fuel cells. Electrospinning is an effective approach for the production of electrode materials with a nanofiber microstructure, which provides straight and continuous pathways for ionic and electronic conduction. In this study, the self-assembled La0.7Sr0.3Fe0.9Ni0.1O3−δ (LSFN)–Ce0.8Sm0.2O2−δ (SDC) composite with a hollow nanofiber structure is synthesized as the cathode material of protonic ceramic fuel cells (PCFCs) through a coaxial electrospinning process. LSFN and SDC are both distributed uniformly in the composite cathode. Compared with composite cathodes prepared through electrospinning with solid and core–shell nanofiber structures, the hollow-fiber LSFN–SDC cathode shows a higher specific surface area and provides more channels for gas diffusion, both of which are beneficial for the oxygen reduction reaction. The LSFN–SDC composite cathode with the hollow fiber structure exhibits the lowest polarization resistance of 0.035 Ω cm2 at 700 °C. A PCFC with that cathode shows a maximum power density of 1598 mW cm–2 and a promising short-term stability at 700 °C.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
SOLID STATE IONICS
·
2021
·
IF 3.785
Yongxin Zhang,Zhiyong Huang,Tian Gan,Nianjun Hou,Lijun Fan,Xin Zhou,Ge Gao,Jingyu Li,Yicheng Zhao,Yongdan Li
Cu Ce 0.8 La 0.1 Sm 0.1 O 2-δ and Cu Ce 0.8 Nd 0.1 Sm 0.1 O 2-δ are studied as anode materials for solid oxide fuel cells with methanol as fuel. The oxygen surface exchange and bulk diffusion coefficients of Ce 0.8 Sm 0.2 O 2-δ both increase with La and Nd doping. The CH 3 OH temperature-programmed surface reaction results show that the addition of La and Nd accelerates the chemical oxidation of CH 3 OH. Furthermore, compared with Cu Ce 0.8 Sm 0.2 O 2-δ , the anodes with La and Nd show higher resistance to coking in CH 3 OH atmosphere. The Cu-based cermet anode exhibits a low catalytic activity for the electrochemical oxidation of H 2 , and a single cell supported by a Ce 0.8 Sm 0.2 O 2-δ ‑carbonate composite electrolyte with Cu Ce 0.8 Sm 0.2 O 2-δ anode exhibits a maximum power density of 160 mW cm −2 at 650 °C using dry hydrogen as fuel. However, the maximum power density reaches 550 mW cm −2 when CH 3 OH is used as fuel, and further increases to 730 and 830 mW cm −2 with the addition of La and Nd in the anode, respectively. The results indicate that with the promotion of the oxygen activity, the Cu-based cermet is a promising anode material for solid oxide fuel cells using CH 3 OH as fuel.
研究领域:
材料科学
·
燃料电池研究
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Qichao Liang,Fei Lu,Farhat Shakeel,Xueying Wang,Yilin Sun,Jiefang Wang,Hai Huang,Jinrui Su,Bin Cai
The porous structure of anodes is crucial to the performance of intermediate-temperature solid state fuel cells (IT-SOFCs). With the rapid development of high performance cathodes, the role of anodes needs to be considered again. A hierarchical porous Ni-Ce 0.8 Sm 0.2 O 2-δ (SDC) anode consisted of ∼200 nm width, and ∼800 nm and ∼10 μm diameter pores can be formed by reducing NiO, and burning of polymethyl methacrylate (PMMA) and starch pore-formers with a total load of 20 wt%, respectively. For single cells with Ni-SDC|SDC|Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ configuration, the peak power density (PPD) (0.26–1.73 W·cm −2 ) at 723–923 K is achieved with the addition of 10 wt% starch + 10 wt% PMMA, which is 136–52 % and 86-14 % higher than that without pore-formers and with 20 wt% starch, respectively. More importantly, it has a similar long-term stability of the cell without pore-formers. The comprehensive results suggest that the apparent improvement in PPDs is primarily attributed to the increased length of effective three-phase boundaries due to the formation of a percolation network of anodes, while also highlighting the significant influence of anode/electrolyte interface polarization on the electrochemical performance of IT-SOFCs.
研究领域:
材料科学
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电化学
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能源材料
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燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2020
·
IF 8.247
Zhiyong Huang,Lijun Fan,Nianjun Hou,Tian Gan,Juanjuan Gan,Yicheng Zhao,Yongdan Li
Ni–Ce 0.8 Pr x Sm 0.2-x O 2-δ (x = 0–0.15) is studied as an anode of solid oxide fuel cells. The doping of Pr facilitates the chemical oxidation of CH 3 OH on the ceramic phase because the strength of Pr–O bond is weaker than that of Ce–O bond. With the addition of Pr, the electronic conductivity of the ceramic phase increases in an oxidizing atmosphere but decreases in a reducing atmosphere. The electrochemical conductivity relaxation results indicate that Pr improves oxygen surface exchange coefficient and oxygen chemical diffusion coefficient of Ce 0.8 Sm 0.2 O 2-δ simultaneously. The doping of Pr shows negligible influence on the performance of the cell fed with H 2 due to the high reactivity of H 2 . However, the maximum power density of the cell with methanol as the fuel increases significantly with the addition of Pr in the anode, demonstrating the high importance of the oxygen activity of the anode when a less active fuel is used. A Ce 0.8 Sm 0.2 O 2-δ -carbonate electrolyte-supported single cell with Ni–Ce 0.8 Pr 0.1 Sm 0.1 O 2-δ anode shows a maximum power density of 792 mW cm −2 at 650 °C with methanol as the fuel.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Fan Yang,Ting Dong,Xixin Zhang,Jingjing Liu,Wentao Tian,Yifei Zhang
Semiconductor ionic electrolytes have obtained much attention because of good ionic conductivity and electrochemical performance. Novel semiconductor ionic NSDC (Ce 0.8 Sm 0.2 O 2-δ -Na 2 CO 3 )-LCCN (LiCo 0·225 Cu 0·075 Ni 0·7 O 3-δ ) composite materials have been adopted as electrolyte membrane for the first time, in which symmetrical cell composed of NSDC-LCCN membrane is constructed with Ni 0·8 Co 0·15 Al 0·05 LiO 2 (NCAl)-pasted Ni foam electrodes. An open circuit voltage (OCV) above 1 V and improved power density are obtained in the NSDC-LCCN cells, which confirms the functionality of the proposed semiconductor ionic materials. Meanwhile, X-ray diffractometer (XRD) and Scanning electron microscope (SEM) analyses identify the phase purity and homogenous nanocomposite morphology of all the NSDC-LCCN materials samples with various mass ratios. The performance illustrated by much more steady instead of transient state evaluation reveals that 3NSDC-LCCN composite electrolyte is most optimum, and the corresponding cell exhibits a considerable maximum power density of 598 mW cm −2 at 550 °C, over five times of that of pure NSDC electrolyte cells . Short-term duration test of 3NSDC-LCCN cell at 550 °C shows that the cell could steadily operate up to ~9 h without obvious degradation at a remarkable current density of 469 mA cm −2 , which indicates that NSDC-LCCN composite electrolyte is a promising material for low 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
SOLID STATE IONICS
·
2024
·
IF 3
Xin Zhao,Jian Zhang,Xuanlin Lu,Wen Liu,Jiaxuan Chen,Yicheng Zhao,Yongdan Li
Self-assembled La 0.7 Sr 0.3 Fe 0.9 Ni 0.1 O 3-δ -Ce 0.8 Sm 0.2 O 1.9-δ (LSFN-SDC) composite cathode with a three-dimensionally ordered macroporous (3DOM) structure is synthesized using poly(methyl methacrylate) as the template for protonic ceramic fuel cells . The LSFN and SDC phases both distribute uniformly in the cathode. The SDC phase reduces the thickness of the walls of the 3DOM structure and thus hinders the bulk conduction of electrons. SDC also decreases the specific surface area and the surface oxygen reactivity of the cathode, leading to the suppression of the adsorption and dissociation of O 2 . However, the SDC phase provides the conduction pathway for oxygen ions and enlarges three phase boundary consequently, which facilitates the charge transfer steps. The thickness of the walls and the specific surface area of the composite cathode are both increased with the rise of the concentration of the nitrate precursor solution, resulting in the acceleration of the cathode process. Nevertheless, an excessive precursor concentration leads to the destroy of the 3DOM structure. The 3DOM composite cathode exhibits the lowest R p of 0.039 Ω cm 2 , and a single cell with that cathode shows maximum power density of 1484 mW cm −2 at 700 °C. The cell exhibits a short-term stability of 120 h at 700 °C without noticeable degradation.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Tian Gan,Hexuan Song,Xinqiang Fan,Ye Liu,Shouqing Liu,Yicheng Zhao,Yongdan Li
A crucial challenge in the commercialization of Ni-based materials as the anode of solid oxide fuel cell is the fast voltage drop due to carbon deposition and structural degradation during cell operation. Herein, Sn-doped Ce 0.8 Sm 0.2 O 2−δ (SDC) supported Sn-Ni alloy anode is rationally designed and prepared, via a simple and convenient dual-modification strategy. The substitution of Sn of Ce in the oxide phase enhances the mobility of lattice oxygen in SDC. Meanwhile, Sn exsolves partially from the oxide phase and forms Ni 3 Sn and Ni 3 Sn 2 intermetallic compounds with Ni after reduction. The composite anode thus formed achieves unprecedent activity in the electrochemical oxidation of H 2 and CH 3 OH. The maximum power densities of a cell supported by 500 μm-thick Ce 0.8 Sm 0.2 O 2−δ -carbonate electrolyte layer with the Ni-Ce 0.7 Sn 0.1 Sm 0.2 O 2−δ (Ni-SSn 10 DC) anode reach 1.99 and 2.11 W cm −2 at 700 °C, respectively for using H 2 and methanol as fuels. The doping of Sn also remarkably enhances the coking resistance of the anode. This work opens a path on the design of high-performance SOFC anode.
研究领域:
材料科学
·
能源技术
✓ 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）