scholarly journals Experimental Study for HIx Concentration by Electro-Electrodialysis (EED) Cells in the Water Splitting Sulfur-Iodine Thermochemical Cycle

2019 ◽  
Vol 3 (2) ◽  
pp. 50 ◽  
Author(s):  
Giampaolo Caputo ◽  
Irena Balog ◽  
Alberto Giaconia ◽  
Salvatore Sau ◽  
Alfonso Pozio
Keyword(s):  
Experimental Study ◽  
Hydrogen Production ◽  
Water Splitting ◽  
Transport Number ◽  
Hydriodic Acid ◽  
Thermochemical Cycle ◽  
Slow Increase ◽  
Electro Osmosis ◽  
A Current ◽  
Splitting Process

The efficiency of HI concentration/separation from a HIx solution, (mixture of HI/H2O/I2) represents a crucial factor in the sulfur-iodine thermochemical water splitting process for hydrogen production. In this paper, an experimental study on HI cathodic concentration in HIx solution using stacked electro-electrodialysis (EED) cells was carried out under the conditions of 1 atm and at three different temperature (25, 55 and 85 °C) and using a current density of 0.10 A/cm2. Results showed that an increase in HI concentration can be obtained under certain conditions. The apparent transport number (t+) in all the experiments was very close to 1, and the electro-osmosis coefficient (β) changed in a range of 1.08–1.16. The tests showed a detectable, though slow, increase in both the anodic iodine and cathodic hydriodic acid concentrations.

Reactive Pellets for Improved Solar Hydrogen Production Based on Sodium Manganese Ferrite Thermochemical Cycle

2008 ◽  
Author(s):  
Carlo Alvani ◽  
Mariangela Bellusci ◽  
Aurelio La Barbera ◽  
Franco Padella ◽  
Marzia Pentimalli ◽  
...  
Keyword(s):  
High Temperature ◽  
Hydrogen Production ◽  
Water Splitting ◽  
Sodium Carbonate ◽  
Production Efficiency ◽  
Manganese Carbonate ◽  
Reactive System ◽  
Thermochemical Cycle ◽  
Manganese Ferrite ◽  
Oxide Mixture

Hydrogen production by water-splitting thermochemical cycle based on manganese ferrite /sodium carbonate reactive system is reported. Two different preparation procedures for manganese ferrite/sodium carbonate mixture were adopted and compared in terms of materials capability to cyclical hydrogen production. According to the first procedure conventionally synthesized manganese ferrite, i. e. high temperature (1250 °C) heating in Ar of carbonate/oxide precursors, was mixed with sodium carbonate. The blend was tested inside a TPD reactor using a cyclical hydrogen production/material regeneration scheme. After few cycles the mixture resulted rapidly passivated and unable to further produce hydrogen. An innovative method that avoids the high temperature synthesis of manganese ferrite is presented. This procedure consists in a set of consecutive thermal treatments of a manganese carbonate/sodium carbonate/iron oxide mixture in different environments (inert, oxidative, reducing) at temperatures not exceeding 750 °C. Such material, whose observed chemical composition consists in manganese ferrite and sodium carbonate in stoichiometric amount, is able to evolve hydrogen during 25 consecutive water-splitting cycles, with a small decrease in cyclical production efficiency.

Hydrogen production via water splitting process in a molten-salt fusion breeder

2010 ◽  
Vol 35 (14) ◽  
pp. 7357-7368 ◽  
Author(s):  
Gülşah Özişik ◽  
Nesrin Demir ◽  
Mustafa Übeyli ◽  
Hüseyin Yapici
Keyword(s):  
Hydrogen Production ◽  
Molten Salt ◽  
Water Splitting ◽  
Fusion Breeder ◽  
Splitting Process

Reactive Pellets for Improved Solar Hydrogen Production Based on Sodium Manganese Ferrite Thermochemical Cycle

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Carlo Alvani ◽  
Mariangela Bellusci ◽  
Aurelio La Barbera ◽  
Franco Padella ◽  
Marzia Pentimalli ◽  
...  
Keyword(s):  
High Temperature ◽  
Hydrogen Production ◽  
Water Splitting ◽  
Sodium Carbonate ◽  
Production Efficiency ◽  
Manganese Carbonate ◽  
Reactive System ◽  
Thermochemical Cycle ◽  
Manganese Ferrite ◽  
Oxide Mixture

Hydrogen production by water-splitting thermochemical cycle based on manganese ferrite/sodium carbonate reactive system is reported. Two different preparation procedures for manganese ferrite/sodium carbonate mixture were adopted and compared in terms of material capability to cyclical hydrogen production. According to the first procedure, conventionally synthesized manganese ferrite, i.e., high temperature (1250°C) heating in Ar of carbonate/oxide precursors, was mixed with sodium carbonate. The blend was tested inside a temperature programed desorption reactor using a cyclical hydrogen production/material regeneration scheme. After a few cycles, the mixture resulted rapidly passivated and unable to further produce hydrogen. An innovative method that avoids the high temperature synthesis of manganese ferrite is presented. This procedure consists in a set of consecutive thermal treatments of a manganese carbonate/sodium carbonate/iron oxide mixture in different environments (inert, oxidative, and reducing) at temperatures not exceeding 750°C. Such material, whose observed chemical composition consists of manganese ferrite and sodium carbonate in stoichiometric amounts, is able to evolve hydrogen during 25 consecutive water-splitting cycles, with a small decrease in cyclical production efficiency.

Hydrogen production via a two-step water splitting thermochemical cycle based on metal oxide – A review

2020 ◽  
Vol 267 ◽  
pp. 114860 ◽  
Author(s):  
Yanpeng Mao ◽  
Yibo Gao ◽  
Wei Dong ◽  
Han Wu ◽  
Zhanlong Song ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Metal Oxide ◽  
Water Splitting ◽  
Thermochemical Cycle

Hydrogen Production Through Two-Step Water Splitting Using YSZ (Ni,Fe) System for Solar Hydrogen Production

Solar Energy ◽  
2005 ◽  
Author(s):  
Hideyuki Ishihara ◽  
Hiroshi Kaneko ◽  
Tsutomu Yokoyama ◽  
Akinori Fuse ◽  
Noriko Hasegawa ◽  
...  
Keyword(s):  
Solid Solution ◽  
Hydrogen Production ◽  
Water Splitting ◽  
Gas Flow ◽  
Molar Ratio ◽  
Iron Ions ◽  
Solar Hydrogen ◽  
Solar Hydrogen Production ◽  
Ar Gas ◽  
Splitting Process

The two-step water splitting with the solid solution of YSZ (Yttrium stabilized Zirconia) and Ni-ferrite (NiFe2O4) was studied for solar hydrogen production. The sample of YSZ/Ni-ferrite solid solution was prepared by calcination of the mixture of the YSZ balls and Ni-ferrite (NiFe2O4) powder. The two-step water splitting process composed of O2-releasing reaction (T = 1773K) in Ar gas flow and H2-generation reaction (T = 1473K) in Ar gas and steam flow with the YSZ/Ni-ferrite solid solution were repeated ten times, and the molar ratio of the released O2 gas and the generated H2 gas was nearly equal to 1:2 in each cycle, indicating that the two-step water splitting process proceeded stoichiometrically. The lattice constants of the YSZ/Ni-ferrite solid solution products after each step of the water splitting process were varied, therefore it was assumed that the oxidation and reduction of the iron ions proceeded in the YSZ phase. It is confirmed that the YSZ/Ni-ferrite was the solid solution and reactive ceramics of high thermal stability. The contents of iron ions determined by the atomic absorption spectroscopy indicated that the YSZ/Ni-ferrite solid solution heated at 1773K contained the only 36% of iron loaded initially. The generated O2 gas was 42% of the theoretical yield. These suggest that YSZ/Ni-ferrite solid solution is more effective reactive ceramics which has the ability to split water with concentrated solar heat than Ni-ferrite.

Construction materials development in sulfur–iodine thermochemical water-splitting process for hydrogen production

2007 ◽  
Vol 32 (4) ◽  
pp. 497-504 ◽  
Author(s):  
B. Wong ◽  
R.T. Buckingham ◽  
L.C. Brown ◽  
B.E. Russ ◽  
G.E. Besenbruch ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Construction Materials ◽  
Materials Development ◽  
Splitting Process

Rotary-Type Solar Reactor for Solar Hydrogen Production with Two-step Water Splitting Process

2007 ◽  
Vol 21 (4) ◽  
pp. 2287-2293 ◽  
Author(s):  
Hiroshi Kaneko ◽  
Takao Miura ◽  
Akinori Fuse ◽  
Hideyuki Ishihara ◽  
Shunpei Taku ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Solar Hydrogen ◽  
Solar Reactor ◽  
Solar Hydrogen Production ◽  
Splitting Process ◽  
Rotary Type
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