Electrical performance of nanostructured strontium-doped lanthanum manganite impregnated onto yttria-stabilized zirconia backbone

Ju, Jiangwei; Lin, Jie; Wang, Yusu; Zhang, Yanxiang; Xia, Changrong

doi:10.1016/j.jpowsour.2015.09.074

Cited by 20 publications

(14 citation statements)

References 35 publications

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“…Nanoparticles can be found on the surface of micro-particles when the SDC loading was 11.4 wt%, Fig 7b . It is observed that the micro-scale LSCM particles are covered with the nano-scale SDC particles, forming additional oxygen conducting network since the surface percolation limit is about 4.5 vol.% (5.0 wt%) for the impregnation system. 39,40 When the loading increased to 18.3 wt%, the LSCM particles were fully covered with SDC particles, Fig 7c . The microstructure feature suggests a well established oxygen-ion conduction path through SDC. The conduction path was further enhanced when the loading increased to 35.5 wt%.…”

Section: Resultsmentioning

confidence: 95%

Effect of Samaria Doped Ceria Impregnation on the Electrochemical Performance of Strontium Doped Lanthanum Chromium Manganite Anode for Solid Oxide Fuel Cells

Zhu

Ding

et al. 2017

J. Electrochem. Soc.

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Strontium doped lanthanum chromium manganite (LSCM) is a potential ceramic anode material for next-generation hydrocarbonfueled solid oxide fuel cells. Because of its relatively low electrochemical performance, however, its application is still limited. This work investigated the effect of samaria-doped ceria (SDC) impregnation on the electrode performance regarding the surface reaction and oxygen-ion transport in the electrode reaction. The results showed that the electrochemical performance had been promoted by incorporating with nano-SDC particles. Electrical conductivity relaxation (ECR) of dense LSCM exhibited significant improvement in the surface exchange coefficient, from 5.34 × 10 −6 cm s −1 at 850 • C for bare LSCM to 1.48 × 10 −4 cm s −1 for LSCM coated with 0.9 mol L −1 SDC precursor solution. The surface reaction promotion factor was about 28 for the nano SDC particle coating, much higher than the factor of 6.5 for LSCM-SDC composite. It was demonstrated that the promotion in surface reaction rate are mainly contributed by LSCM-SDC-gas three-phase boundaries (3PB). Interfacial polarization resistances of SDC impregnated LSCM symmetrical cells presented over 1 order of magnitude reduction at 850 • C with a SDC loading of 35.8 wt%. The electrode performance improvement was attributed to the connective oxygen ion conduction path and increased 3PB formed by the impregnated SDC particles.

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Section: Resultsmentioning

confidence: 95%

Effect of Samaria Doped Ceria Impregnation on the Electrochemical Performance of Strontium Doped Lanthanum Chromium Manganite Anode for Solid Oxide Fuel Cells

Zhu

Ding

et al. 2017

J. Electrochem. Soc.

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“…We also systematically reported the effects of backbone particle radius, backbone porosity, infiltrated nanoparticle radius, and aggregation risk of infiltrated nanoparticles on the geometric properties of the first type electrode. With the help of this numerical model, Ju and coworkers found that 5 vol% LSM infiltrated YSZ electrodes reached maximal conductivity and the lowest polarization resistance, corresponding to the highest TPB length. In a follow‐up study, we adapted the model to the second type of electrodes and found that dual‐phase infiltration results in more TPB sites .…”

Section: Introductionmentioning

confidence: 99%

A numerical study of infiltrated solid oxide fuel cell electrode with dual‐phase backbone

2018

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Summary Three‐dimensional microstructure of infiltrated solid oxide fuel cell electrodes with dual‐phase backbone is simulated numerically. This work employs LSM (lanthanum strontium manganite) infiltrated LSM yttria‐stabilized zirconia composite electrodes as an example. Important geometric properties, including percolation probability of LSM, total and percolated three‐phase boundary (TPB) lengths, and total and percolated surface areas of LSM, are calculated under various LSM nanoparticle loadings. One important finding is that compared with pure yttria‐stabilized zirconia backbone, dual‐phase backbone results in lower TPB length and has little impact on the surface area of LSM particles. Therefore, the addition of LSM backbone may be ineffective, even negative in promoting the electrode performance, however, can significantly reduce the LSM infiltration threshold loading to form a percolating network. The trade‐off between decreasing infiltration cycle and increasing TPB length demands an optimized content of LSM in backbone.

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“…Subsequently, in the case of classical strontium-doped lanthanum manganite (LSM), the high p-type electronic conductivity arises from the presence of mixed valence Mn (Mn 3+ and Mn 4+ ), which is enhanced by doping with Sr 2+ ion. This doping allows LSM to have a potential application in the electro-catalysts because of its high stability, good catalytic activity toward oxygen reduction reaction, and excellent compatibility with the yttriastabilized zirconia (YSZ) electrolyte (Jorgensen and Mogensen 2001;Sholklapper et al 2007;Orera and Slater 2010;Liu et al 2013;Ju et al 2016). LSM has good electronic conductivity but possesses poor ionic conductivity.…”

Section: Introductionmentioning

confidence: 99%

An investigation of structure and electrical characteristics of lanthanum strontium manganite nanopowders with different Sr²⁺ ion concentrations

Turky

Rashad

Hassan

et al. 2017

Particulate Science and Technology

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Generally, the efficiency of solid oxide fuel cells (SOFCs) is heavily dependent on the electrocatalytic activity of the cathode toward the oxygen reduction reaction (ORR). In order to achieve a better cathode performance, LaxSr1-xMnO3 (LSM) nanopowders with different Sr 2+ ion contents varying from 0.2 to 0.8 have been synthesized using the co-precipitation method. The obtained nanoparticles were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and electrochemical impedance spectroscopy (EIS). It is found that the LSM nanoparticles were seemed to exhibit the high polarization resistance with the increase of the Sr 2+ ion molar ratios. The crystallite size was found to increase from 16.4 to 24.3 nm with increasing the Sr 2+ content from 0.2 to 0.8. The lattice parameters were decreased with Sr 2+ ion content which may be caused by an increase in internal stress with increasing the grain size of LSM. Meanwhile, the real part impedance (Z') was increased from 10(Ω) at 0.2 Sr 2+ to be 24(Ω) at 0.8 Sr 2+ ion ratio. Alternatively, |Z| of prepared sample was increased from 12 to 26 (Ω) by increasing Sr 2+ ion molar ratios from 0.2 to 0.8.

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Electrical performance of nanostructured strontium-doped lanthanum manganite impregnated onto yttria-stabilized zirconia backbone

Cited by 20 publications

References 35 publications

Effect of Samaria Doped Ceria Impregnation on the Electrochemical Performance of Strontium Doped Lanthanum Chromium Manganite Anode for Solid Oxide Fuel Cells

Effect of Samaria Doped Ceria Impregnation on the Electrochemical Performance of Strontium Doped Lanthanum Chromium Manganite Anode for Solid Oxide Fuel Cells

A numerical study of infiltrated solid oxide fuel cell electrode with dual‐phase backbone

An investigation of structure and electrical characteristics of lanthanum strontium manganite nanopowders with different Sr²⁺ ion concentrations

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Electrical performance of nanostructured strontium-doped lanthanum manganite impregnated onto yttria-stabilized zirconia backbone

Cited by 20 publications

References 35 publications

Effect of Samaria Doped Ceria Impregnation on the Electrochemical Performance of Strontium Doped Lanthanum Chromium Manganite Anode for Solid Oxide Fuel Cells

Effect of Samaria Doped Ceria Impregnation on the Electrochemical Performance of Strontium Doped Lanthanum Chromium Manganite Anode for Solid Oxide Fuel Cells

A numerical study of infiltrated solid oxide fuel cell electrode with dual‐phase backbone

An investigation of structure and electrical characteristics of lanthanum strontium manganite nanopowders with different Sr2+ ion concentrations

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An investigation of structure and electrical characteristics of lanthanum strontium manganite nanopowders with different Sr²⁺ ion concentrations