Dense Metal Membranes for the Production of High-Purity Hydrogen

MRS Bulletin ◽  
2006 ◽  
Vol 31 (10) ◽  
pp. 770-773 ◽  
Author(s):  
David S. Sholl ◽  
Y.H. Ma
Keyword(s):  
High Purity ◽  
Atomic Hydrogen ◽  
Molecular Hydrogen ◽  
Physical Mechanism ◽  
Hydrogen Diffusion ◽  
Metal Films ◽  
Metal Alloy ◽  
Hydrogen Purification ◽  
Hydrogen Transport ◽  
High Purity Hydrogen

AbstractDense metal membranes are a well-developed technology for the production of high-purity hydrogen. The physical mechanism of hydrogen transport across metal films—dissociation of molecular hydrogen, diffusion of interstitial atomic hydrogen, and subsequent recombinative desorption of molecular hydrogen—means that metal membranes can have extremely high selectivities for hydrogen transport relative to other gases. We describe current experimental and theoretical trends in the development of metal alloy membranes for hydrogen purification in practical, chemically robust processes.

A Case for Molecular Hydrogen Being the Mobile H Species in a-Si:H

2000 ◽  
Vol 609 ◽  
Author(s):  
P. A. Fedders
Keyword(s):  
Activation Energy ◽  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Molecular Hydrogen ◽  
Hydrogen Diffusion ◽  
Hydrogen Transport ◽  
Mobile Species ◽  
Standard Picture ◽  
Dynamics Simulations ◽  
Induced Defects

ABSTRACTThe mechanism (or mechanisms) of hydrogen transport in a-Si:H is of great intrinsic interest but is also important for the understanding of a number of phenomena such as light induced defects. We find that the literature includes many calculations for the activation energy for hydrogen diffusion that are at best misleading and often interpreted incorrectly. In this paper we summarize a number of calculations that apply to particles hopping in complex media and apply the results to a-Si:H. These calculations, coupled with existing estimates of the energy of various H configurations in a-Si:H, show that the standard picture is likely to be incorrect. However, previous work on the mobility of molecular hydrogen in crystalline Si coupled with some molecular dynamics simulations presented in this paper show that the mobile species of hydrogen in a-Si:H may well be molecular.

Evaluation of Electric Load Following Capability on Fuel Cell System Fueled by High-Purity Hydrogen

2011 ◽  
Vol 131 (12) ◽  
pp. 927-935
Author(s):  
Yusuke Doi ◽  
Deaheum Park ◽  
Masayoshi Ishida ◽  
Akitoshi Fujisawa ◽  
Shinichi Miura
Keyword(s):  
Fuel Cell ◽  
High Purity ◽  
Cell System ◽  
Electric Load ◽  
Fuel Cell System ◽  
Load Following ◽  
High Purity Hydrogen

A Strategy for Preparing High-efficiency and Economical Catalytic Electrodes toward Overall Water Splitting

Nanoscale ◽  
2021 ◽  
Author(s):  
Dongxue Yao ◽  
Lingling Gu ◽  
Bin Zuo ◽  
Shuo Weng ◽  
Shengwei Deng ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Production Technology ◽  
High Purity ◽  
High Efficiency ◽  
Energy Development ◽  
Overall Water Splitting ◽  
Important Field ◽  
High Purity Hydrogen

The technology of electrolyzing water to prepare high-purity hydrogen is an important field in today's energy development. However, how to prepare efficient, stable, and inexpensive hydrogen production technology from electrolyzed...

scholarly journals Development of an effective bi-functional Ni–CaO catalyst-sorbent for the sorption-enhanced water gas shift reaction through structural optimization and the controlled deposition of a stabilizer by atomic layer deposition

2020 ◽  
Vol 4 (2) ◽  
pp. 713-729 ◽  
Author(s):  
Sung Min Kim ◽  
Andac Armutlulu ◽  
Agnieszka M. Kierzkowska ◽  
Davood Hosseini ◽  
Felix Donat ◽  
...  
Keyword(s):  
Structural Optimization ◽  
High Purity ◽  
Atomic Layer ◽  
Water Gas Shift ◽  
Water Gas Shift Reaction ◽  
Layer Deposition ◽  
Controlled Deposition ◽  
Shift Reaction ◽  
Water Gas ◽  
High Purity Hydrogen

Bi-functional Ni–hollow CaO stabilized by ALD-grown Al2O3 overcoat for sorption-enhanced water-gas shift reaction producing high purity hydrogen.

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