EFFECT OF NICKEL CONTENTS ON THE MICROSTRUCTURE OF MESOPOROUS NICKEL OXIDE/GADOLINIUM-DOPED CERIA

2013 ◽  
Vol 06 (06) ◽  
pp. 1350055 ◽  
Author(s):  
SEUNGHYUN AHN ◽  
HYUN KOO ◽  
SUNG-HWAN BAE ◽  
CHAN PARK ◽  
GUYOUNG CHO ◽  
...  
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Self Assembly ◽  
Specific Area ◽  
Mesoporous Structure ◽  
Growth Behavior ◽  
Solid Oxide ◽  
Nano Particles ◽  
Pluronic F127 ◽  
Doped Ceria ◽  
Structure Directing Agent

The effect of NiO contents on the microstructure of mesoporous NiO - Gd 0.25 Ce 0.75 O 2-x ( NiO -GDC) composite for intermediate temperature solid oxide fuel cells (IT-SOFC) was investigated. Mesoporous NiO -GDC powders with different NiO contents were synthesized by self-assembly hydrothermal method using tri-block copolymer, Pluronic F127, as a structure directing agent. Grain growth/agglomeration behaviors of NiO particles and changes of mesoporous structure of GDC particles were characterized by microstructural analyses. NiO -GDC powders were composed of GDC nano particles with ordered mesopore inside the particles and octahedral NiO grains with truncated-edges. As the amount of NiO increases, specific area value of mesoporous NiO -GDC was decreased, and the agglomeration/growth behavior of NiO grains was accelerated.

Gadolinium doped ceria nanostructured oxide for intermediate temperature solid oxide fuel cells

2021 ◽  
pp. 160444
Author(s):  
S.U. Costilla-Aguilar ◽  
M.I. Pech-Canul ◽  
M.J. Escudero ◽  
R.F. Cienfuegos-Pelaes ◽  
J.A. Aguilar-Martínez
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Intermediate Temperature ◽  
Doped Ceria ◽  
Oxide Fuel ◽  
Nanostructured Oxide ◽  
Gadolinium Doped Ceria

scholarly journals Transport Properties and High Temperature Raman Features of Heavily Gd-Doped Ceria

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4148 ◽  
Author(s):  
Cristina Artini ◽  
Sabrina Presto ◽  
Sara Massardo ◽  
Marcella Pani ◽  
Maria Maddalena Carnasciali ◽  
...  
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Oxygen Vacancies ◽  
Arrhenius Plot ◽  
Solid Oxide ◽  
Raman Shift ◽  
Threshold Temperature ◽  
Doped Ceria ◽  
Lower Activation ◽  
Slope Change ◽  
Heavily Doped

Transport and structural properties of heavily doped ceria can reveal subtle details of the interplay between conductivity and defects aggregation in this material, widely studied as solid electrolyte in solid oxide fuel cells. The ionic conductivity of heavily Gd-doped ceria samples (Ce1−xGdxO2−x/2 with x ranging between 0.31 and 0.49) was investigated by impedance spectroscopy in the 600–1000 K temperature range. A slope change was found in the Arrhenius plot at ~723 K for samples with x = 0.31 and 0.34, namely close to the compositional boundary of the CeO2-based solid solution. The described discontinuity, giving rise to two different activation energies, points at the existence of a threshold temperature, below which oxygen vacancies are blocked, and above which they become free to move through the lattice. This conclusion is well supported by Raman spectroscopy, due to the discontinuity revealed in the Raman shift trend versus temperature of the signal related to defects aggregates which hinder the vacancies movement. This evidence, observable in samples with x = 0.31 and 0.34 above ~750 K, accounts for a weakening of Gd–O bonds within blocking microdomains, which is compatible with the existence of a lower activation energy above the threshold temperature.

Improved lifetime and stability of copper species in hierarchical, copper-incorporated CuSAPO-34 verified by catalytic model reactions

2021 ◽  
Author(s):  
Guro Sørli ◽  
Muhammad Mohsin Azim ◽  
Magnus Ronning ◽  
Karina Mathisen
Keyword(s):  
Absorption Spectroscopy ◽  
Mesoporous Structure ◽  
Single Site ◽  
Pluronic F127 ◽  
Structure Directing Agent ◽  
Copper Species ◽  
X Ray ◽  
X Ray Absorption ◽  
Model Reactions

The first successful synthesis of hierarchical CuSAPO-34 (3.9 wt.% Cu) is reported using the polymer Pluronic F127 as mesoporous structure directing agent (SDA). X-ray absorption spectroscopy (XAS) proved single site...

scholarly journals SDC-Infiltrated Microporous Silver Membrane with Superior Resistance to Thermal Agglomeration for Cathode-Supported Solid Oxide Fuel Cells

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2181 ◽  
Author(s):  
Tsung-Han Lee ◽  
Jong Baek ◽  
Liangdong Fan ◽  
Florencia Wiria ◽  
Pei-Chen Su ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Precursor Solution ◽  
Solid Oxide ◽  
Pore Surface ◽  
Doped Ceria ◽  
Oxide Fuel ◽  
Microporous Structure ◽  
Ion Conducting ◽  
Porous Silver

This work presents a microporous silver cathode membrane reinforced with infiltration of samarium-doped ceria (SDC). The ion-conducting SDC effectively confines the surface of a porous silver membrane to maintain microporous structure and prevents the electrode agglomeration. SDC precursor solution is fired together with silver membrane at 700 °C for 2 h and formed as a nanocrystalline SDC on the silver pore surface. The SDC-infiltrated microporous silver membrane shows superior resistance to agglomeration without noticeable change in microstructures even at 900 °C for 12 h, which makes it promising for the application of solid oxide fuel cells as a cathode support.

scholarly journals Semiconductor-ionic Membrane of LaSrCoFe-oxide-doped Ceria Solid Oxide Fuel Cells

2017 ◽  
Vol 248 ◽  
pp. 496-504 ◽  
Author(s):  
Baoyuan Wang ◽  
Yixiao Cai ◽  
Chen Xia ◽  
Jung-Sik Kim ◽  
Yanyan Liu ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Doped Ceria ◽  
Oxide Fuel
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