Synthesis and characterization of doped apatite-type lanthanum silicates for SOFC applications

Gasparyan, Hripsime; Neophytides, Stylianos G.; Niakolas, Dimitrios K.; Stathopoulos, Vassilis N.; Kharlamova, Tamara; Sadykov, Vladіslav; Biest, Omer Van der; Jothinathan, Ezhil; Louradour, E.; Joulin, Jean-Pierre; Bebelis, S.

doi:10.1016/j.ssi.2010.11.025

Cited by 33 publications

(24 citation statements)

References 19 publications

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“…In line with expectations, at an intermediate temperature of 700°C, the total ionic conductivities of these dense polycrystalline pellets are 2–3 orders lower compared with single crystals of similar composition measured along c axis direction (Table ). Also, the conductivities of the Al‐free ( x = 0) and highly doped ( x = 2.0) Nd (28+ x )/3 Al x Si 6− x O 26 pellets are comparable to reported data of dense undoped La 9.33 Si 6 O 26 sample fabricated by SPS and Al‐doped La 9.83 Al 1.5 Si 4.5 O 26 fabricated with conventional sintering . This shows that although Nd 3+ ions are slightly smaller than La 3+ ions, which lead to the shrinkage of the unit cell that could hinder O 2− transport, the Nd–(Al)Si–O and La–(Al)Si–O apatites have similar performance.…”

Section: Resultssupporting

confidence: 78%

Oxygen Migration in Dense Spark Plasma Sintered Aluminum‐Doped Neodymium Silicate Apatite Electrolytes

Baikie

Herrin

et al. 2013

J. Am. Ceram. Soc.

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Neodymium silicate apatites are promising intermediate temperature (500°C-700°C) electrolytes for solid oxide fuel cells. The introduction of Al promotes isotropic percolation of O 2− , and at low levels (0.83-2.0 wt% Al) enhances bulk conductivity. To better understand the effect of Al-doping on intrinsic conductivity, and the impact of grain boundaries on the transport, dense Nd 9.33+x/3 Al x Si 6−x O 26 (0 ≤ x ≤ 2) pellets were prepared by spark plasma sintering. Phase purity of the products was established by powder X-ray diffraction and the microstructure examined by scanning electron microscopy. The ionic conductivity measured by AC impedance spectroscopy for the spark plasma sintered ceramics were compared with transport in single crystals of similar composition. Intermediate Al-doping (0.5 ≤ x ≤ 1.5) delivered superior overall conductivity for both the polycrystalline and single crystal specimens. W.-C. Wei-contributing editor Manuscript No. 32730.

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Section: Resultssupporting

confidence: 78%

Oxygen Migration in Dense Spark Plasma Sintered Aluminum‐Doped Neodymium Silicate Apatite Electrolytes

Baikie

Herrin

et al. 2013

J. Am. Ceram. Soc.

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“…LFSO exhibited single phased crystallographic structure at the hexagonal apatite structure in space group P36/m (176) (PDF#00-049-0443). The characteristic two major peaks of apatite structure at 2θ=30.76 ο and 2θ=30.95 ο indicated a small shift of +0.02 o at LFSO indicating the doping effect of Fe into Si site of a stoichiometric apatite (La10Si6O26) structure as reported in our former works [5][6][7][8]. From Archimedes method the dense pellets exhibited a relative density of 96%, thus enabling LFSO as a suitable substrate of deploying layer deposition techniques.…”

Section: Xrd Of Dense Electrolytesupporting

confidence: 53%

“…Thus the past years alternative types of electrolytes have been investigated in order to overcome the aforementioned disadvantages [1][2][3][4]. Fe-and Al-doped apatite-type lanthanum silicates (ATLS) have attracted the interest due to their thermodynamic stability, robustness and their high ionic conductivity at intermediate temperatures [5][6][7][8]. Not many researchers have tried to fabricate and study ATLS electrolyte based fuel cells for an estimation of cell performance and degradation with state of the art electrodes [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Development of layered anode structures supported over Apatite-type Solid Electrolytes

Pandis

Kharlamova

Садыков

et al. 2016

MATEC Web of Conferences

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Abstract. Apatite-type lanthanum silicates (ATLS) materials have attracted interest in recent literature as solid electrolytes for SOFCs. The fabrication of an ATLS based fuel cell with the state-of-art electrodes (NiO/YSZ as anode and LSCF or LSM as cathode) can show degradation after long operation hours due to Si diffusion mainly towards the anode. In this work, we report a "layer-by-layer anodic electrodes" fabrication by means of spin coating and physical spraying. The overall aim of this work is the successful fabrication of such a layered structure including suitable blocking layers towards the inhibition of Si interdiffusion from the apatite electrolyte to the anode. The results showed that the deposition of 3 layers of LFSO/GDC (3μm), NiO/GDC (4μm) and the final NiO/YSZ anode layer provided a stable half-cell, with no solid state reaction occurring among the electrodes and no Si diffusion observed towards the anode after thermal treatment at 800 o C for 120h.

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“…In any case, an MFC remains a complex system that involves a number of technological, electrochemical and microbiological aspects, which need to be understood before the technology can be implemented in practice and in real life environments. Electrochemical Impedance Spectroscopy (EIS) is a technique widely used to give an insight to the electrochemical phenomena in fuel cells [8][9][10][11]. This technique has become a valuable and in-depth understanding tool for phenomena occurring in individual MFC units as well as in MFC stacks [12,13].…”

Section: Introductionmentioning

confidence: 99%

Performance assessment of a four-air cathode membraneless microbial fuel cell stack for wastewater treatment and energy extraction

et al. 2019

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A stack of two identical single chamber microbial fuel cells (MFCs) was assessed during using fermentable house hold extract as substrate. The design of the MFC units was based on the single chamber membrane-less technology using four cathode electrodes. The total power output was 492 mW either in series or parallel connection considering a total anolyte volume of 240 cm3. During continuous operation, the COD removal was 80% for each cell and for both operation modes (series and parallel). The electrochemical profiles provided significant information on the behaviour of the stack. During continuous operation, parallel connection is preferred over series connection, as it results to the same power output values, and COD removal but it provides lower internal resistances leading to more stable electrochemical performance behaviour.

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Synthesis and characterization of doped apatite-type lanthanum silicates for SOFC applications

Cited by 33 publications

References 19 publications

Oxygen Migration in Dense Spark Plasma Sintered Aluminum‐Doped Neodymium Silicate Apatite Electrolytes

Oxygen Migration in Dense Spark Plasma Sintered Aluminum‐Doped Neodymium Silicate Apatite Electrolytes

Development of layered anode structures supported over Apatite-type Solid Electrolytes

Performance assessment of a four-air cathode membraneless microbial fuel cell stack for wastewater treatment and energy extraction

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