Processing and conduction behavior of nanocrystalline Gd-doped and rare earth co-doped ceria electrolytes

Babu, A.S.; Bauri, Ranjit; Reddy, G. Kesava

doi:10.1016/j.electacta.2016.05.118

Cited by 36 publications

(11 citation statements)

References 63 publications

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“…5), which corresponded to the creation of oxygen vacancies, thereby losing lattice oxygen [25][26][27]. Babu et al also showed that the GCO doping with trivalent ions led to the generation of oxygen vacancies [8]. However, the mass loss increased for the composite samples with an increase in Nd content.…”

Section: Thermal Analysismentioning

confidence: 99%

“…Furthermore, it can be easily modified by doping with rare-earth or other elements to supply promising properties suitable for SOFC, oxygen sensor, or electrolysis applications [5][6][7]. Gadolinium-doped ceria (GCO) is a well known derivate of ceria and has been reported as one of the key ionic conductive electrolyte materials for SOFC [8]. Moreover, GCO also exhibits significant electronic conductivity due to the reduction of Ce 4+…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical performance of novel NGCO-LSCF composite cathode for intermediate temperature solid oxide fuel cells

Samreen

Gálvez-Sánchez

Steinberger‐Wilckens

et al. 2020

International Journal of Hydrogen Energy

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Section: Thermal Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrochemical performance of novel NGCO-LSCF composite cathode for intermediate temperature solid oxide fuel cells

Samreen

Gálvez-Sánchez

Steinberger‐Wilckens

et al. 2020

International Journal of Hydrogen Energy

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“…Energi aktivasi bisa didapatkan melalui panas pada suhu tertentu sehingga dapat memberikan vibrasi kecil pada elektron terluar pada pembawa muatan yang biasa disebut dengan agitasi panas. Menurut Babu et al [21], Nd 3+ dapat menurunkan energi aktivasi pada serium terdoping neodimium (NDC terdoping tunggal). Tidak hanya Gd 3+ yang dapat menyediakan kekosongan oksigen dengan baik, namun dengan adanya Nd 3+ yang mampu menurunkan energi aktivasi, konduktivitas GDC-Nd 0,025 dapat meningkat dengan mudah.…”

Section: Analisis Elektrokimia (Electrochemical Impedance Spectroscopy)unclassified

SINTESIS DAN KARAKTERISASI ELEKTROLIT Ce0,9Gd0,1-XNdXO1,90 UNTUK APLIKASI SEL BAHAN BAKAR PADATAN SUHU SEDANG

Raharjo

Damisih²,

Hapsari³

et al. 2018

JUSAMI

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Elektrolit berbasis serium seperti GDC10 telah banyak dikembangkan untuk aplikasi sel bahan bakar oksida padatan suhu sedang atau yang dikenal dengan Intermediate Temperature Solid Oxide Fuel Cell (IT-SOFC). Kodoping merupakan salah satu cara untuk meningkatkan konduktivitas elektrolit IT-SOFC. Tujuan dari penelitian ini adalah untuk mempelajari pengaruh penambahan kodopan neodimium (Nd) terhadap GDC10 (Ce0,9Gd0,1-xNdxO1,90) dengan rasio molar x = 0,025; 0,050; dan 0,075 terhadap sifat fisis dan elektrokimianya. Neodimium digunakan sebagai kodopan karena dapat menurunkan energi aktivasi, sehingga konduktivitas elektrolit meningkat. Metode sintesis yang digunakan adalah sol gel untuk menghasilkan serbuk GDC terdoping Nd, setelah itu serbuk dibuat pelet. Sampel dikarakterisasi dengan menggunakan X-Ray Diffraction (XRD) untuk mengidentifikasi fasa, Scanning Electron Microscope (SEM) untuk melihat morfologi dan Thermal Gravimetric Analysis (TGA) untuk melihat stabilitas termalnya. Dari hasil penelitian, kalsinasi pada suhu 700 oC selama 5 jam dan sintering pada suhu 1350 oC selama 2 jam diperoleh densitas pelet elektrolit lebih besar dari 95%. Hal ini telah memenuhi syarat sebagai elektrolit sel bahan bakar padatan yang baik. Keseluruhan sampel memiliki struktur kubik dengan ukuran kristal antara 4,26 nm hingga 4,47 nm. GDC10 terdoping neodimium dengan rasio molar x = 0,025 (GDC-Nd0,025) memiliki konduktivitas tertinggi yaitu 0,055 S/cmpada suhu 600 oC. Hasil tersebut menunjukkan bahwa kodoping dapat meningkatkan konduktivitas sel elektrolit GDC untuk aplikasi sel bahan bakar oksida padatan suhu sedang.

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“…The effects of dopant concentration [1][2][3][4], grain size [5,6], synthesis [7,8] and processing [9,10] on electrical properties have been comprehensively studied. However, the vast majority of recent works dealing with electrical properties of GDC ceramics still encountered a pretty low total conductivity due to a high resistivity of grain boundaries [9,[11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…However, in most previous studies [9][10][11][12][13][14][15][16][17][18][19], grain boundary measurements were carried out by the 2-electrode method. This restricted the opportunities to measure the pure electrical response of grain boundary due to the sample-electrode interface polarization effect.…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of charge carrier relaxation in grain boundary of gadolinium-doped ceria ceramics

Kazlauskas¹,

Kazakevičius²,

Žalga³

et al. 2019

physics

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Two different gadolinium-doped ceria ceramics are prepared from two different powders, one commercially available synthesised by solid state reaction and another produced by tartaric acid assisted sol–gel synthesis. The specimens have a different microstructure, while the XRD patterns of powders showed a pure cubic fluorite structure without any impurity phase. The electrical properties are studied at frequencies up to 10 GHz by combining broadband 2-electrode and 4-electrode impedance spectroscopy methods. Primary electrical measurements showed that the values of grain conductivity and its activation energies for both ceramics were nearly the same. However, due to different contributions of the grain boundary mediums, total conductivities and their activation energies are found to be considerably different. The advantage of the 4-electrode method allowed us to measure the pure electrical response of grain boundaries, bypassing any interferences caused by interfacial impedance. By using these data, the temperature behaviour of distribution of relaxation times in the grain boundary is studied. A broadening of this distribution with increasing temperature is found for both specimens, contrary to a previously observed phenomenon in the grain of oxygen ion conductive ceramics and single crystals. It is shown that, supposing individual relaxation times behave according to the Arrhenius law, both activation energy and pre-exponential factor must be distributed.

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Processing and conduction behavior of nanocrystalline Gd-doped and rare earth co-doped ceria electrolytes

Cited by 36 publications

References 63 publications

Electrochemical performance of novel NGCO-LSCF composite cathode for intermediate temperature solid oxide fuel cells

Electrochemical performance of novel NGCO-LSCF composite cathode for intermediate temperature solid oxide fuel cells

SINTESIS DAN KARAKTERISASI ELEKTROLIT Ce0,9Gd0,1-XNdXO1,90 UNTUK APLIKASI SEL BAHAN BAKAR PADATAN SUHU SEDANG

Peculiarities of charge carrier relaxation in grain boundary of gadolinium-doped ceria ceramics

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