Effective utilization of by-product oxygen from electrolysis hydrogen production

Kato, Tatsuya; Kubota, Mitsuhiro; Kobayashi, Noriyuki; Suzuoki, Yasuo

doi:10.1016/j.energy.2004.07.004

Cited by 113 publications

(57 citation statements)

References 5 publications

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“…26 Small-scale water electrolyzers may be used to produce pure hydrogen and oxygen for diverse applications, such as use of hydrogen gas in laboratories and oxygen in life-support systems in hospitals. 27 It has been shown that for small systems, the dominant factor in determining the cost of electrolytic hydrogen is the cost of the electrolysis cells, whereas for large systems electricity cost and hydrogen value dominate the discussion. 13 Although hydrogen possesses the advantages of availability, flexibility, and high purity, for its widespread applications hydrogen production using water electrolysis needs improvements in energy efficiency, safety, durability, operability, and portability, and, above all, reduction in installation and operation costs.…”

Section: Figure 1 Conceptual Energy System Using Water Electrolysismentioning

confidence: 99%

“…The Tafel equations can also be written as follows: (27) Under pure mass transfer control, the expression for j can be written in the form of Eq. 28, where η conc is the concentration overpotential and j L is the limiting current density, which is the current at which the surface concentration of reactant falls to the limiting case of zero: (28) In practice, it is common to experience a large region of η where the reaction rate is controlled partly by reactant supply and partly by electron transfer.…”

Section: ) (24)mentioning

confidence: 99%

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Hydrogen production by alkaline water electrolysis

Santos¹,

Sequeira²,

Figueiredo³

2013

Quím. Nova

389

226

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Recebido em 13/12/12; aceito em 28/5/13; publicado na web em 17/7/13Water electrolysis is one of the simplest methods used for hydrogen production. It has the advantage of being able to produce hydrogen using only renewable energy. To expand the use of water electrolysis, it is mandatory to reduce energy consumption, cost, and maintenance of current electrolyzers, and, on the other hand, to increase their efficiency, durability, and safety. In this study, modern technologies for hydrogen production by water electrolysis have been investigated. In this article, the electrochemical fundamentals of alkaline water electrolysis are explained and the main process constraints (e.g., electrical, reaction, and transport) are analyzed. The historical background of water electrolysis is described, different technologies are compared, and main research needs for the development of water electrolysis technologies are discussed.

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Section: Figure 1 Conceptual Energy System Using Water Electrolysismentioning

confidence: 99%

Section: ) (24)mentioning

confidence: 99%

Hydrogen production by alkaline water electrolysis

Santos¹,

Sequeira²,

Figueiredo³

2013

Quím. Nova

389

226

View full text Add to dashboard Cite

show abstract

“…In both cases the most cost effective, and for that reason widely used, method for oxygen production is cryogenic air separation [18,19]. The cryogenic air separation process costs about 0.5 kW h/N m 3 O 2 [3].…”

Section: The Market For Oxygenmentioning

confidence: 99%

“…However, it is also important to widen one's views and look for opportunities to use the byproducts of the process. Kato et al [3] have investigated the demand for oxygen in Japan and shown the contribution to process efficiency. As an example they showed how selling oxygen to hospitals in Japan makes electrolysis comparable in price with steam reforming.…”

Section: Introductionmentioning

confidence: 99%

Advantages of integration with industry for electrolytic hydrogen production

Saxe

Alvfors

2007

Energy

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“…80% efficiency, but more than 93% efficiency may eventually be possible [19][20][21][22]. The efficiency of storage devices for hydrogen is between 88% and 95% [23].…”

Section: Efficiencies Used In the Alternativesmentioning

confidence: 99%

Fuel-efficiency of hydrogen and heat storage technologies for integration of fluctuating renewable energy sources

Mathiesen

Lund

2005

2005 IEEE Russia Power Tech

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General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.? Users may download and print one copy of any publication from the public portal for the purpose of private study or research. ? You may not further distribute the material or use it for any profit-making activity or commercial gain ? You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access to the work immediately and investigate your claim. Abstract -This paper presents the methodology and results of analysing the use of different energy storage technologies in the task of integration of fluctuating renewable energy sources (RES) into the electricity supply. The analysis is done on the complete electricity system including renewable energy sources as well as power plants and CHP (Combined heat and power production). Emphasis is put on the need for ancillary services. Devices to store electricity as well as devices to store heat can be used to help the integration of fluctuating sources. Electricity storage technologies can be used to relocate electricity production directly from the sources, while heat storage devices can be used to relocate the electricity production from CHP plants and hereby improve the ability to integrate RES. The analyses are done by advanced computer modelling and the results are given as diagrams showing the system ability to integrate RES inputs between 0 and 100 percent of the electricity demand.

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Effective utilization of by-product oxygen from electrolysis hydrogen production

Cited by 113 publications

References 5 publications

Hydrogen production by alkaline water electrolysis

Hydrogen production by alkaline water electrolysis

Advantages of integration with industry for electrolytic hydrogen production

Fuel-efficiency of hydrogen and heat storage technologies for integration of fluctuating renewable energy sources

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