Thermodynamic Analysis of Mixed-Metal Ferrites for Hydrogen Production by Two-Step Water Splitting

Solar Energy ◽  
2006 ◽  
Author(s):  
Mark D. Allendorf ◽  
Richard B. Diver ◽  
James E. Miller ◽  
Nathan P. Siegel
Keyword(s):  
Hydrogen Production ◽  
Metal Oxides ◽  
Water Splitting ◽  
Thermodynamic Analysis ◽  
Thermal Reduction ◽  
Spinel Ferrites ◽  
Mixed Metal ◽  
Production Of Hydrogen ◽  
Splitting Process

A thermodynamic analysis of the two-step water splitting process for the production of hydrogen is reported in this paper. Calculations simulating the preparation of ferrite samples, their thermal reduction to form a mixture of metal oxides, and subsequent reoxidation with steam to produce hydrogen were performed. Mixed-metal spinel ferrites of the general form MFe2O4, where M = Co, Ni, or Zn, are compared with iron spinel, Fe3O4. The results indicate that of the four ferrites examined, nickel spinel has the most favorable combination of properties for use in two-step water splitting.

scholarly journals Hydrogen production from water electrolysis: role of catalysts

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Shan Wang ◽  
Aolin Lu ◽  
Chuan-Jian Zhong
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Noble Metal ◽  
Active Sites ◽  
Current Knowledge ◽  
Low Cost ◽  
Critical Role ◽  
Water Electrolysis ◽  
Efficient Production ◽  
Production Of Hydrogen

AbstractAs a promising substitute for fossil fuels, hydrogen has emerged as a clean and renewable energy. A key challenge is the efficient production of hydrogen to meet the commercial-scale demand of hydrogen. Water splitting electrolysis is a promising pathway to achieve the efficient hydrogen production in terms of energy conversion and storage in which catalysis or electrocatalysis plays a critical role. The development of active, stable, and low-cost catalysts or electrocatalysts is an essential prerequisite for achieving the desired electrocatalytic hydrogen production from water splitting for practical use, which constitutes the central focus of this review. It will start with an introduction of the water splitting performance evaluation of various electrocatalysts in terms of activity, stability, and efficiency. This will be followed by outlining current knowledge on the two half-cell reactions, hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), in terms of reaction mechanisms in alkaline and acidic media. Recent advances in the design and preparation of nanostructured noble-metal and non-noble metal-based electrocatalysts will be discussed. New strategies and insights in exploring the synergistic structure, morphology, composition, and active sites of the nanostructured electrocatalysts for increasing the electrocatalytic activity and stability in HER and OER will be highlighted. Finally, future challenges and perspectives in the design of active and robust electrocatalysts for HER and OER towards efficient production of hydrogen from water splitting electrolysis will also be outlined.

scholarly journals Chiral Aggregates of Triphenylamine‐Based Dyes for Depleting the Production of Hydrogen Peroxide in the Photochemical Water‐Splitting Process

2019 ◽  
Vol 102 (5) ◽  
pp. e1900065 ◽  
Author(s):  
Beatrice Adelizzi ◽  
Andreas T. Rösch ◽  
Daan J. van Rijen ◽  
R. Simone Martire ◽  
Serkan Esiner ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Water Splitting ◽  
Production Of Hydrogen ◽  
Splitting Process

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.

scholarly journals Photoelectrochemical Water Splitting Reaction System Based on Metal-Organic Halide Perovskites

Materials ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 210 ◽  
Author(s):  
Dohun Kim ◽  
Dong-Kyu Lee ◽  
Seong Min Kim ◽  
Woosung Park ◽  
Uk Sim
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Fossil Fuels ◽  
Reaction System ◽  
Hydrogen Gas ◽  
Production Environment ◽  
Organic Halide ◽  
Highly Active ◽  
Production Of Hydrogen ◽  
Metal Organic

In the development of hydrogen-based technology, a key challenge is the sustainable production of hydrogen in terms of energy consumption and environmental aspects. However, existing methods mainly rely on fossil fuels due to their cost efficiency, and as such, it is difficult to be completely independent of carbon-based technology. Electrochemical hydrogen production is essential, since it has shown the successful generation of hydrogen gas of high purity. Similarly, the photoelectrochemical (PEC) method is also appealing, as this method exhibits highly active and stable water splitting with the help of solar energy. In this article, we review recent developments in PEC water splitting, particularly those using metal-organic halide perovskite materials. We discuss the exceptional optical and electrical characteristics which often dictate PEC performance. We further extend our discussion to the material limit of perovskite under a hydrogen production environment, i.e., that PEC reactions often degrade the contact between the electrode and the electrolyte. Finally, we introduce recent improvements in the stability of a perovskite-based PEC device.

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
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