Performance of stainless steel 316L electrodes with modified surface to be use in alkaline water electrolyzers

Lavorante, María José; Franco, J.I.

doi:10.1016/j.ijhydene.2016.02.096

Cited by 43 publications

(26 citation statements)

References 19 publications

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“…In turn, there are those who claim that, for the estimated global capacity of electrolyzers, it will be necessary to dispense with noble metals [116]. Therefore, there are experiences using stainless steel electrodes seeking to improve their electrical efficiency [117]. Besides, Cruden et al [118] compare electrodes based on…”

Section: Electrode Materialsmentioning

confidence: 99%

Advances in alkaline water electrolyzers: A review

David

Ocampo‐Martínez

Peña

2019

Journal of Energy Storage

473

235

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The renewed concern for the care of the environment has led to lower emissions of greenhouse gases without sacrificing modern comforts. Widespread proposal focuses on energy produced from renewable sources and its subsequent storage and transportation based on hydrogen. Currently, this gas applies to the chemical industry and its production is based on fossil fuels. The introduction of this energy vector requires the development of environmental-friendly methods for obtaining it. In this paper, existing techniques are just presented and the main focus is made on electrolysis, a mature procedure. In turn, some developed proposals as previous steps to the hydrogen economy are presented. Finally, some lines of research to improve alkaline electrolysis technology are commented.

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Section: Electrode Materialsmentioning

confidence: 99%

Advances in alkaline water electrolyzers: A review

David

Ocampo‐Martínez

Peña

2019

Journal of Energy Storage

473

235

View full text Add to dashboard Cite

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“…Considering the dimension of the flat original electrode, the active area is 99 cm 2 . Adding channels to this area every 0.1 centimeters allows incorporating 55 channels and these represent an increase of 49.5 cm 2 of surface area [8].…”

Section: Electrode Machining: Straight-parallel Topologymentioning

confidence: 99%

“…Current measurements were made at a certain potential between 0.0 and 3.0 V, changing the applied voltage differences 0.1 V every 30 s. Working conditions were atmospheric pressure and initial temperature of the electrolytic solution at 30.1 ∘ C. Voltage, current and temperature were the monitor parameters. The current for each potential was recorded at the end of each step (after every 30 s period) [8].…”

Section: Experiments In the Electrolyticmentioning

confidence: 99%

“…Its production has an average efficiency of around 2 International Journal of Electrochemistry 30-40% with respect to the primary energy sources so, for the electrolyser, it is generally below 40% [7]. In most industrial electrolysers, the energy consumption is 4.5-5 kWh/Nm 3 n H 2 [7,8]. This is the reason why the use of this type of technology could be more attractive when the source of energy is totally renewable.…”

Section: Introductionmentioning

confidence: 99%

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Straight-Parallel Electrodes and Variable Gap for Hydrogen and Oxygen Evolution Reactions

Lavorante

Reynoso

Franco

2019

International Journal of Electrochemistry

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The challenges to be overtaken with alkaline water electrolysis are the reduction of energy consumption, the maintenance, and the cost as well as the increase of durability, reliability, and safety. Having these challenges in mind, this work focused on the reduction of the electrical resistance of the electrolyte which directly affects energy consumption. According to the definition of electrical resistance of an object, the reduction of the space between electrodes could lower the electrical resistance but, in this process, the formation of bubbles could modify this affirmation. In this work, the performance analyses of nine different spaces between stainless steel 316L electrodes were carried out, although the spaces proposed are not the same as those from the positive electrode (anode) to the separator and from the separator to the negative electrode (cathode). The reason why this is studied is that stoichiometry of the reaction states that two moles of hydrogen and one mole of oxygen can be obtained per every two moles of water. The proposed spaces were 10.65, 9.20, 8.25, 7.25, 6.30, 6.05, 4.35, 4.15, and 3.40 millimetres. From the nine different analysed distances between electrodes, it can be said that the best performance was reached by one of the smallest distances proposed, 4.15 mm. When the same distance between electrodes was compared (the same and different distance between electrodes and separator), the one that had almost twice the distance (negative compartment) presented an increase in current density of approximately 33% with respect to that where both distances (from electrodes to separator) are the same. That indicates that the stichometry of the electrolysis reaction influenced the performance.

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“…1,2 Moreover, nonexpensive and industrially scalable catalysts for alkaline electrolyser’s electrodes obtained by simple methods are, nowadays, one of the technological topics most critical for systems useful for storage and conversion of energy. 3−5…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Hybrid Ni/Nitrogenated Graphene Electrocatalysts for Hydrogen Evolution Reaction

et al. 2019

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Two nickel/nitrogenated graphene hybrid electrodes ( Ni-NrGO NH3 and Ni-NrGO APTES ) were synthesized, and their catalytic activity with respect to the hydrogen evolution reaction (HER) in alkaline media was analyzed. Incorporation of nitrogen to the carbon structure in graphene oxide (GO) or reduced GO (rGO) flakes in aqueous solutions was carried out based on two different configurations. NrGO NH 3 particles were obtained by a hydrothermal method using ammonium hydroxide as the precursor, and NGO APTES particles were obtained by silanization (APTES functionalization) of GO sheets. Aqueous dispersions containing NrGO NH 3 and NGO APTES particles were added to the traditional nickel Watts plating bath in order to prepare the Ni-NrGO NH 3 and Ni-NrGO APTES catalysts, respectively. Nickel substrates were coated with the hybrid nickel electrodeposits and used as electrodes for hydrogen production. The Ni-NrGO catalysts show a higher activity than the conventional nickel electrodeposited electrodes, particularly the ones containing APTES molecules because they allow obtaining a hydrogen current density 130% higher than conventional Ni-plated electrodes with a Watts bath in the absence of additives. In addition, both catalysts show a low deactivation rate during the ageing treatment, which is a sign of a longer midlife for the catalyst. Cyclic voltammetry and electrochemical impedance spectroscopy measurements were used for examination of the catalytic efficiency of hybrid Ni-NrGO electrodes for HER in KOH solution. High values of exchange current densities, 8.53 × 10 –4 and 2.53 × 10 –5 mA cm –2 for HER in alkaline solutions on Ni-NrGO NH 3 and Ni-NrGO APTES electrodes, respectively, were obtained.

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Performance of stainless steel 316L electrodes with modified surface to be use in alkaline water electrolyzers

Cited by 43 publications

References 19 publications

Advances in alkaline water electrolyzers: A review

Advances in alkaline water electrolyzers: A review

Straight-Parallel Electrodes and Variable Gap for Hydrogen and Oxygen Evolution Reactions

Highly Efficient Hybrid Ni/Nitrogenated Graphene Electrocatalysts for Hydrogen Evolution Reaction

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