Photovoltaic-assisted alkaline water electrolysis: Basic principles

Djafour, Ahmed; Matoug, M.; Bouras, H.; Bouchekima, Bachir; Aida, M.S.; Azoui, B.

doi:10.1016/j.ijhydene.2010.09.099

Cited by 45 publications

(23 citation statements)

References 19 publications

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“…[1][2][3] It is anticipated that renewables will eventually replace traditional fossil fuel-burning and nuclear power plants. However, intermittent power supply of renewables means that energy needs to be buffered.…”

mentioning

confidence: 99%

On the Origin of the Improved Ruthenium Stability in RuO₂–IrO₂Mixed Oxides

Kasian

Geiger

Stock

et al. 2016

J. Electrochem. Soc.

114

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High oxygen evolution reaction activity of ruthenium and long term stability of iridium in acidic electrolytes make their mixed oxides attractive candidates for utilization as anodes in water electrolyzers. Indeed, such materials were addressed in numerous previous studies. The application of a scanning flow cell connected to an inductively coupled plasma mass spectrometer allowed us now to examine the stability and activity toward oxygen evolution reaction of such mixed oxides in parallel. The whole composition range of Ir-Ru mixtures has been covered in a thin film material library. In the whole composition range the rate of Ru dissolution is observed to be much higher than that of Ir. Eventually, due to the loss of Ru, the activity of the mixed oxides approaches the value corresponding to pure IrO 2 . Interestingly, the loss of only a few percent of a monolayer in Ru surface concentration results in a significant drop in activity. Several explanations of this phenomenon are discussed. It is concluded that the herein observed stability of mixed Ir-Ru oxide systems is most likely a result of high corrosion resistance of the iridium component, but not due to an alteration of the material's electronic structure. Renewable primary energies such as solar energy, wind energy and ocean energy receive more and more attention and are increasingly installed around the world.1-3 It is anticipated that renewables will eventually replace traditional fossil fuel-burning and nuclear power plants. However, intermittent power supply of renewables means that energy needs to be buffered. Thereby, hydrogen produced by water electrolysis is considered as an ideal energy carrier to adjust the balance between the generation of power by renewable primary energy and energy demand for end-use.3-5 Currently, acidic proton exchange membrane water electrolysis (PEMWE) is considered as a promising technology for this purpose. However, the widespread use of PEMWE is hindered by high capital costs, low efficiency, and shortages related to performance deterioration with time. 6 In this connection the nature of electrocatalysts and the procedure of their production and application conditions play a critical role. Materials used as electrocatalysts must be as active as possible to improve efficiency, while at the same time they need to be stable to maintain this efficiency throughout the lifetime of the electrolyzer. This is especially critical for materials catalyzing the anodic oxygen evolution reaction (OER), because of the detrimental positive potential and highly corrosive acidic environment. Only a few catalysts are able to withstand these harsh conditions, while providing sufficient activity, conductivity and mechanical stability. In fact, only iridium oxide anodes are proven to provide the required longevity of operation. On the other hand, ruthenium shows the highest electrocatalytic activity toward this reaction. 7,8 During the last decades, the electrochemical and surface properties of anodes based on these metals and their oxides we...

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mentioning

confidence: 99%

On the Origin of the Improved Ruthenium Stability in RuO₂–IrO₂Mixed Oxides

Kasian

Geiger

Stock

et al. 2016

J. Electrochem. Soc.

114

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“…PV/electrolysis is a technology that indirectly uses solar energy based on photovoltaic electrolysis for splitting hydrogen from water. It is an important research direction of hydrogen production by renewable energy [37]. And furthermore, the abundant geothermal resource in Liaoning Province is also a good renewable energy option for hydrogen production [38].…”

Section: Co 2 Potential Utilizationmentioning

confidence: 99%

Cold energy utilization of liquefied natural gas for capturing carbon dioxide in the flue gas from the magnesite processing industry

Zhao

Dong

Tang

et al. 2016

Energy

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“…The shape of an individual nanorod is rectangular with sharp edges and termination in a pyramid shape peak, as was shown in Figure 1 The electrolysis process involves the transfer of electrical charge from one chemical species to another [20] [21]. The electron in the vicinity of the reacting molecule can be modeled as a particle in a one dimensional potential well.…”

Section: Electrolysis Of Dilute Aqueous Solutions Of H 2 Somentioning

confidence: 99%

Effect of Wetting on the Ability of Nanomaterials to Act as Effective Catalysts

Cross¹,

Varhue²,

McDevitt³

et al. 2016

ACES

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The ability of some nanostructured materials to perform as effective heterogeneous catalysts is potentially hindered by the failure of the liquid reactant to effectively wet the solid catalyst surface. In this work, two different chemical reactions, each involving a change of phase from liquid to gas on a solid catalyst surface, are investigated. The first reaction is the catalyzed decomposition of a H 2 O 2 monopropellant within a micro-chemical reactor chamber, decorated with RuO 2 nanorods (NRs). The second reaction involves the electrolysis of dilute aqueous solutions of H 2 SO 4 performed with the cathode electrode coated with different densities and sizes of RuO 2 NRs. In the catalyzed H 2 O 2 decomposition, the reaction rate is observed to decrease with increasing catalyst surface density because of a failure of the liquid to wet on the catalyst surface. In the electrolysis experiment, however, the reaction rate increased in proportion to the surface density of RuO 2 NRs. In this case, the electrical bias applied to drive the electrolysis reaction also causes an electrostatic force of attraction between the fluid and the NR coated surface, and thus assures effective wetting.

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Photovoltaic-assisted alkaline water electrolysis: Basic principles

Cited by 45 publications

References 19 publications

On the Origin of the Improved Ruthenium Stability in RuO₂–IrO₂Mixed Oxides

On the Origin of the Improved Ruthenium Stability in RuO₂–IrO₂Mixed Oxides

Cold energy utilization of liquefied natural gas for capturing carbon dioxide in the flue gas from the magnesite processing industry

Effect of Wetting on the Ability of Nanomaterials to Act as Effective Catalysts

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Photovoltaic-assisted alkaline water electrolysis: Basic principles

Cited by 45 publications

References 19 publications

On the Origin of the Improved Ruthenium Stability in RuO2–IrO2Mixed Oxides

On the Origin of the Improved Ruthenium Stability in RuO2–IrO2Mixed Oxides

Cold energy utilization of liquefied natural gas for capturing carbon dioxide in the flue gas from the magnesite processing industry

Effect of Wetting on the Ability of Nanomaterials to Act as Effective Catalysts

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On the Origin of the Improved Ruthenium Stability in RuO₂–IrO₂Mixed Oxides

On the Origin of the Improved Ruthenium Stability in RuO₂–IrO₂Mixed Oxides