Highly Active Binder Free Plasma Sprayed Non-Noble Metal Electrodes for Anion Exchange Membrane Electrolysis at Different Reduced KOH Concentrations

Razmjooei, Fatemeh; Reißner, Regine; Gago, Aldo; Ansar, Asif

doi:10.1149/09208.0689ecst

Cited by 7 publications

(4 citation statements)

References 41 publications

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“…The AWE cell exhibited high current densities of 0.56 and 2.3 A cm −2 at 1.8 and 2.2 V, respectively, in 30 wt.% KOH at 70 °C. This performance is very close to that of the recently reported performance with the same electrode package in 30 wt.% KOH using the Zirfon separator 37 . However, the cell showed even higher performance with current densities of 0.72 and 2 A cm −2 at 1.8 and 2.2 V, respectively at slightly elevated temperature 90 °C, representing a novel prime example of HER catalysts, which can effectively catalyze the HER in alkaline electrolyzer.…”

Section: Resultssupporting

confidence: 88%

Improving plasma sprayed Raney-type nickel–molybdenum electrodes towards high-performance hydrogen evolution in alkaline medium

Razmjooei

Liu

Azevedo

et al. 2020

Sci Rep

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Rationally designed free-standing and binder-free Raney-type nickel-molybdenum (ni-Mo) electrodes produced via atmospheric plasma spraying (APS) are developed by correlating APS process parameters with the microstructure of electrodes and their electrochemical performance in alkaline media. the results revealed that the electrode morphology and elemental composition are highly affected by the plasma parameters during the electrode fabrication. It is found that increasing plasma gas flow rate and input plasma power resulted in higher in-flight particle velocities and shorter dwell time, which in result delivered electrodes with much finer structure exhibiting homogeneous distribution of phases, larger quantity of micro pores and suitable content of Ni and Mo. Tafel slope of electrodes decreased with increasing the in-flight particles velocities from 71 to 33 mV dec −1 in 30 wt.% KOH. However, beyond a critical threshold in-flight velocity and temperature of particles, electrodes started to exhibit larger globular pores and consequently reduced catalytic performance and higher Tafel slop of 36 mV dec −1 in 30 wt.% KOH. Despite slightly lower electrochemical performance, the electrodes produced with highest plasma gas flow and energy showed most inter-particle bonded structure as well as highest stability with no measurable degradation over 47 days in operation as HER electrode in 30 wt.% KOH. The Raney-type Ni-Mo electrode fabricated at highest plasma gas flow rate and input plasma power has been tested as HER electrode in alkaline water electrolyzer, which delivered high current densities of 0.72 and 2 A cm −2 at 1.8 and 2.2 V, respectively, representing a novel prime example of HER electrode, which can synergistically catalyze the HER in alkaline electrolyzer. This study shows that sluggish alkaline HER can be circumvented by rational electrode composition and interface engineering. Hydrogen has attracted a lot of attention as a clean energy carrier, due to growing pressure on emissions and depleting reserves of fossil fuel. Alkaline water electrolysis (AWE) is one of the most mature and widely used electrolysis technologies for hydrogen production due to the inexpensive non-precious metal electrodes, low cost components and high durability 1-4. However, AWE operate at significantly lower current densities compared to proton exchange membrane water electrolysis (PEMWE). This can be due to this reason that not only the oxygen

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Section: Resultssupporting

confidence: 88%

Improving plasma sprayed Raney-type nickel–molybdenum electrodes towards high-performance hydrogen evolution in alkaline medium

Razmjooei

Liu

Azevedo

et al. 2020

Sci Rep

Self Cite

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“…The steel meshes were cleaned in an ultrasonic bath with a mixture of deionized water and ethanol (50 : 50) for 30 min. The power used during the coating process was varied (16,17,20,24, and 38 kW) by modifying the flow and ratio of the primary and secondary gases and the electrical current used to generate the plasma, see Table S1 in the ESI. † A robotic arm (ABB 2600) was used to manipulate the plasma torch.…”

Section: Electrode Preparationmentioning

confidence: 99%

“…1(b)). [22][23][24] Before performing Al leaching, we carried out a series of XRD studies to identify how the spraying distance and power affected the constituents and catalytic activity of the as-sprayed NiAlMo coatings. As a first optimization step, we kept the spraying distance (distance between the nozzle and the substrate) constant at 250 mm and then we prepared coatings using 20, 24, and 38 kW.…”

Section: Characteristics Of Nickel-molybdenum Coatingsmentioning

confidence: 99%

Scalable production of foam-like nickel–molybdenum coatings via plasma spraying as bifunctional electrocatalysts for water splitting

García

Rafei

et al. 2023

Phys. Chem. Chem. Phys.

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“…They are supplied in their bromide (Br − ) or chloride (Cl − ) forms, so they have to be pre-treated to replace these ions by hydroxide (OH − ) groups before their incorporation in AEMWE cells. This is generally achieved by immersion in NaOH or KOH solutions for, at least, 24-48 h [38][39][40][41]. Some studies have assessed the performance and stability of these membranes [37,43].…”

Section: Anion Exchange Membranesmentioning

confidence: 99%

Recent Advances in Alkaline Exchange Membrane Water Electrolysis and Electrode Manufacturing

et al. 2021

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Water electrolysis to obtain hydrogen in combination with intermittent renewable energy resources is an emerging sustainable alternative to fossil fuels. Among the available electrolyzer technologies, anion exchange membrane water electrolysis (AEMWE) has been paid much attention because of its advantageous behavior compared to other more traditional approaches such as solid oxide electrolyzer cells, and alkaline or proton exchange membrane water electrolyzers. Recently, very promising results have been obtained in the AEMWE technology. This review paper is focused on recent advances in membrane electrode assembly components, paying particular attention to the preparation methods for catalyst coated on gas diffusion layers, which has not been previously reported in the literature for this type of electrolyzers. The most successful methodologies utilized for the preparation of catalysts, including co-precipitation, electrodeposition, sol–gel, hydrothermal, chemical vapor deposition, atomic layer deposition, ion beam sputtering, and magnetron sputtering deposition techniques, have been detailed. Besides a description of these procedures, in this review, we also present a critical appraisal of the efficiency of the water electrolysis carried out with cells fitted with electrodes prepared with these procedures. Based on this analysis, a critical comparison of cell performance is carried out, and future prospects and expected developments of the AEMWE are discussed.

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Highly Active Binder Free Plasma Sprayed Non-Noble Metal Electrodes for Anion Exchange Membrane Electrolysis at Different Reduced KOH Concentrations

Cited by 7 publications

References 41 publications

Improving plasma sprayed Raney-type nickel–molybdenum electrodes towards high-performance hydrogen evolution in alkaline medium

Improving plasma sprayed Raney-type nickel–molybdenum electrodes towards high-performance hydrogen evolution in alkaline medium

Scalable production of foam-like nickel–molybdenum coatings via plasma spraying as bifunctional electrocatalysts for water splitting

Recent Advances in Alkaline Exchange Membrane Water Electrolysis and Electrode Manufacturing

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