Exceptional hydrogen permeation of all-ceramic composite robust membranes based on BaCe0.65Zr0.20Y0.15O3−δ and Y- or Gd-doped ceria

2015 ◽  
Vol 8 (12) ◽  
pp. 3675-3686 ◽  
Author(s):  
Elena Rebollo ◽  
Cecilia Mortalò ◽  
Sonia Escolástico ◽  
Stefano Boldrini ◽  
Simona Barison ◽  
...  
Keyword(s):  
Ceramic Composite ◽  
Hydrogen Permeation ◽  
Ceramic Composites ◽  
Hydrogen Separation ◽  
Doped Ceria ◽  
Separation Membranes ◽  
All Ceramic

Mixed proton and electron conductor ceramic composites were examined as hydrogen separation membranes at moderate temperatures (higher than 500 °C).

Electrical and Hydrogen Transport Properties of SrCe0.8Yb0.2O3−δ/Ni Cermet Membranes

2004 ◽  
Vol 835 ◽  
Author(s):  
S.-J. Song ◽  
T. H. Lee ◽  
L. Chen ◽  
C. Zuo ◽  
S. E. Dorris ◽  
...  
Keyword(s):  
Mechanical Stability ◽  
Hydrogen Permeation ◽  
Electron Flow ◽  
Hydrogen Permeability ◽  
Permeation Rate ◽  
Hydrogen Separation ◽  
Metal Composite ◽  
Conducting Oxides ◽  
Separation Membranes ◽  
Increasing Demand

AbstractResearch on hydrogen separation membranes is motivated by the increasing demand for an environmentally benign, inexpensive technology for separating hydrogen from gas mixtures. Although most studies of hydrogen separation membranes have focused on proton-conducting oxides by themselves, the addition of metal to these oxides increases their hydrogen permeability and improves their mechanical stability. This study began by determining the electrical and hydrogen permeation properties of SrCe0.8Yb0.2O3−δ (SCYb). The results showed that the hydrogen permeation rate is limited by electron flow at the investigated temperatures (600 – 900°C). To further enhance hydrogen permeability, a cermet (i.e., ceramic-metal composite) membrane was made by adding Ni to the SCYb. The cermet showed no phase change after sintering in a reducing atmosphere. At 900°C, with 20% H2 /balance He as a feed gas (pH2O = 0.03 atm), the hydrogen permeation rate was 0.113 cm3/min-cm2 for Ni/SCYb (0.43-mm thick) and 0.008 cm3/min-cm2 for SCYb (0.7-mm thick). The dependences of hydrogen permeability on temperature, thickness, and hydrogen partial pressure gradients are also determined. The results demonstrate that adding Ni to SCYb considerably increases its hydrogen permeability by increasing its electron conductivity.

Fabrications and Evaluations of Hydrogen Permeation on Al2O3-CuO-ZnO(ACZ)/Pd Coated Membrane

2011 ◽  
Vol 695 ◽  
pp. 255-258
Author(s):  
Kyeong Il Kim ◽  
Sung Woong Yoo ◽  
Na Ri Lee ◽  
Tae Whan Hong
Keyword(s):  
Hydrogen Production ◽  
High Purity ◽  
Ceramic Membrane ◽  
Hydrogen Permeation ◽  
Porous Ceramic ◽  
Hydrogen Permeability ◽  
Ceramic Composites ◽  
Hydrogen Separation ◽  
Porous Ceramic Membrane ◽  
High Purity Hydrogen

The most promising methods for high purity hydrogen production are membranes separation such as polymer, metal, ceramic and composites. It is well known that Pd and Pd-alloys membranes have excellent properties for hydrogen separation. However, it has hydrogen embrittlement and high cost for practical applications. Therefore, most scientists have studied new materials instead of Pd and Pd-alloys. On the other hand, ceramic materials are great in resistance to acids and chemically stable under high operating temperature. Recent research in cermet materials for membrane applications interests to permeability and selectivity of hydrogen. High purity hydrogen can be produced through simple process by membrane. Recently, research in ceramic composites for membrane applications attract to hydrogen separation. Porous ceramic membrane process which has high permeability and hydrogen flux is chemically and thermally stable. Therefore, they are attractive for applications in hydrogen production process. However, porous ceramic membrane had low selectivity, hard to produce high purity hydrogen. Many studies were carried out Pd and Pd alloys coating, they were fabricated dense cermet membrane. In this work, ACZ ceramic membrane was fabricated disk type membrane by cold isostatic press (CIP) and then coated Pd and Pd-alloys.. It was characterized by XRD, SEM, EDX and BET. Also, we estimated the hydrogen permeability by Sievert's type hydrogen permeation membrane equipment.

Electrical properties and flux performance of composite ceramic hydrogen separation membranes

2015 ◽  
Vol 3 (10) ◽  
pp. 5392-5401 ◽  
Author(s):  
J. S. Fish ◽  
S. Ricote ◽  
R. O'Hayre ◽  
N. Bonanos
Keyword(s):  
Composite Material ◽  
Electrical Properties ◽  
Ceramic Composite ◽  
Composite Ceramic ◽  
Hydrogen Separation ◽  
Dual Phase ◽  
Hydrogen Flux ◽  
Separation Membranes ◽  
Plasma Sintering ◽  
Spark Plasma

Dual-phase ceramic composite hydrogen separation membranes composed of STN and BCZY are fabricated by spark plasma sintering. The electrical properties and hydrogen flux performance are evaluated, revealing challenges for this unique composite material.

All-ceramic asymmetric membranes with superior hydrogen permeation

2018 ◽  
Vol 6 (32) ◽  
pp. 15718-15727 ◽  
Author(s):  
Daniel Montaleone ◽  
Elisa Mercadelli ◽  
Sonia Escolástico ◽  
Angela Gondolini ◽  
José M. Serra ◽  
...  
Keyword(s):  
Hydrogen Permeation ◽  
Hydrogen Separation ◽  
Asymmetric Membranes ◽  
Separation Membrane ◽  
All Ceramic ◽  
Hydrogen Separation Membrane

BaCe0.65Zr0.20Y0.15O3−δ–Gd0.2Ce0.8O2−δ composite with a planar asymmetrical architecture for highly performant hydrogen separation membrane.

scholarly journals Hydrogen separation membranes based on dense ceramic composites in the La27W5O55.5–LaCrO3 system

2015 ◽  
Vol 479 ◽  
pp. 39-45 ◽  
Author(s):  
Jonathan M. Polfus ◽  
Wen Xing ◽  
Marie-Laure Fontaine ◽  
Christelle Denonville ◽  
Partow P. Henriksen ◽  
...  
Keyword(s):  
Ceramic Composites ◽  
Hydrogen Separation ◽  
Separation Membranes ◽  
Dense Ceramic

HREM interface studies in SiC-whisker-reinforced Al2O3 and Si3N4 ceramics

1988 ◽  
Vol 46 ◽  
pp. 734-735
Author(s):  
W. Braue ◽  
R.W. Carpenter ◽  
D.J. Smith
Keyword(s):  
Analytical Data ◽  
Base Material ◽  
High Strength ◽  
Ceramic Composites ◽  
Good Thermal Stability ◽  
All Ceramic ◽  
Sic Whiskers ◽  
Base Composite ◽  
C 30 ◽  
Si3n4 Ceramics

Whisker and fiber reinforcement has been established as an effective toughening concept for monolithic structural ceramics to overcome limited fracture toughness and brittleness. SiC whiskers in particular combine both high strength and elastic moduli with good thermal stability and are compatible with most oxide and nonoxide matrices. As the major toughening mechanisms - crack branching, deflection and bridging - in SiC whiskenreinforced Al2O3 and Si3N41 are critically dependent on interface properties, a detailed TEM investigation was conducted on whisker/matrix interfaces in these all-ceramic- composites.In this study we present HREM images obtained at 400 kV from β-SiC/α-Al2O3 and β-SiC/β-Si3N4 interfaces, as well as preliminary analytical data. The Al2O3- base composite was hotpressed at 1830 °C/60 MPa in vacuum and the Si3N4-base material at 1725 °C/30 MPa in argon atmosphere, respectively, adding a total of 6 vt.% (Y2O3 + Al2O3) to the latter to promote densification.

Biomimetic materials: An introduction

1992 ◽  
Vol 50 (2) ◽  
pp. 1020-1021 ◽  
Author(s):  
M. Sarikaya ◽  
J. T. Staley ◽  
I. A. Aksay
Keyword(s):  
Self Assembly ◽  
Structural Control ◽  
Hierarchical Structures ◽  
Ceramic Composites ◽  
Advanced Materials ◽  
Length Scale ◽  
Spider Webs ◽  
Biomimetic Materials ◽  
Synthetic Materials ◽  
All Ceramic

Biomimetics is an area of research in which the analysis of structures and functions of natural materials provide a source of inspiration for design and processing concepts for novel synthetic materials. Through biomimetics, it may be possible to establish structural control on a continuous length scale, resulting in superior structures able to withstand the requirements placed upon advanced materials. It is well recognized that biological systems efficiently produce complex and hierarchical structures on the molecular, micrometer, and macro scales with unique properties, and with greater structural control than is possible with synthetic materials. The dynamism of these systems allows the collection and transport of constituents; the nucleation, configuration, and growth of new structures by self-assembly; and the repair and replacement of old and damaged components. These materials include all-organic components such as spider webs and insect cuticles (Fig. 1); inorganic-organic composites, such as seashells (Fig. 2) and bones; all-ceramic composites, such as sea urchin teeth, spines, and other skeletal units (Fig. 3); and inorganic ultrafine magnetic and semiconducting particles produced by bacteria and algae, respectively (Fig. 4).

scholarly journals Simultaneous PAN Carbonization and Ceramic Sintering for Fabricating Carbon Fiber-Ceramic Composite Heaters

2019 ◽  
Vol 9 (22) ◽  
pp. 4945 ◽  
Author(s):  
Daiqi Li ◽  
Bin Tang ◽  
Xi Lu ◽  
Quanxiang Li ◽  
Wu Chen ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Thermal Performance ◽  
Ceramic Composite ◽  
Ceramic Composites ◽  
Indoor Climate ◽  
Climate Control ◽  
Ceramic Tiles ◽  
Ceramic Sintering ◽  
Physical Features ◽  
Pan Fibers

In this study, a single firing was used to convert stabilized polyacrylonitrile (PAN) fibers and ceramic forming materials (kaolin, feldspar, and quartz) into carbon fiber/ceramic composites. For the first time, PAN carbonization and ceramic sintering were achieved simultaneously in one thermal cycle and the microscopic morphologies and physical features of the obtained carbon fiber/ceramic composites were characterized in detail. The obtained carbon fiber/ceramic composite showed comparable flexural strength as commercial ceramic tiles. Meanwhile, the composite showed exceptional electro-thermal performance based on the electro-thermal performance of the carbonized PAN fibers, which could reach 108 ℃ after 15 s, 204 ℃ after 90 s, and 292 ℃ after 450 s at 5 V (2.6 A), thereby making the ceramic composite a good candidate as an indoor climate control heater, defogger device, kettle, and other heating element.

A multi-scale flow analysis in hydrogen separation membranes using a coupled DSMC-SPH method

2012 ◽  
Vol 37 (1) ◽  
pp. 894-902 ◽  
Author(s):  
Jianjun Ye ◽  
Jian Yang ◽  
Jinyang Zheng ◽  
Xianting Ding ◽  
Ieong Wong ◽  
...  
Keyword(s):  
Flow Analysis ◽  
Hydrogen Separation ◽  
Sph Method ◽  
Multi Scale ◽  
Separation Membranes
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