A membrane-less electrolyzer with porous walls for high throughput and pure hydrogen production

Hadikhani, Pooria; Hashemi, S. Mohammad H.; Schenk, Steven A.

doi:10.1039/d1se00255d

Cited by 34 publications

(20 citation statements)

References 61 publications

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“…Such a pH can improve catalyst and dopant stability and further increase selectivity toward OER compared to acidic media [38]. A flowing seawater feed in a membrane-less design could yield these conditions and save costs associated with the membrane and cooling requirements in a deployed electrolyzer [40,41]. The cathode fouling by the Mg(OH) 2 -rich deposits observed in bulk seawater testing in this work may limit HER.…”

Section: Discussionmentioning

confidence: 89%

The Influence of Transitional Metal Dopants on Reducing Chlorine Evolution during the Electrolysis of Raw Seawater

et al. 2021

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Electrocatalytic water splitting is a possible route to the expanded generation of green hydrogen; however, a long-term challenge is the requirement of fresh water as an electrolyzer feed. The use of seawater as a direct feed for electrolytic hydrogen production would alleviate fresh water needs and potentially open an avenue for locally generated hydrogen from marine hydrokinetic or off-shore power sources. One environmental limitation to seawater electrolysis is the generation of chlorine as a competitive anodic reaction. This work evaluates transition metal (W, Co, Fe, Sn, and Ru) doping of Mn-Mo-based catalysts as a strategy to suppress chlorine evolution while sustaining catalytic efficiency. Electrochemical evaluations in neutral chloride solution and raw seawater showed the promise of a novel Mn-Mo-Ru electrode system for oxygen evolution efficiency and enhanced catalytic activity. Subsequent stability testing in a flowing raw seawater flume highlighted the need for improved catalyst stability for long-term applications of Mn-Mo-Ru catalysts. This work highlights that elements known to be selective toward chlorine evolution in simple oxide form (e.g., RuO2) may display different trends in selectivity when used as isolated dopants, where Ru suppressed chlorine evolution in Mn-based catalysts.

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Section: Discussionmentioning

confidence: 89%

The Influence of Transitional Metal Dopants on Reducing Chlorine Evolution during the Electrolysis of Raw Seawater

et al. 2021

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“…Regarding electrode structures, Hadikhani et al developed a novel porous wall electrolyzer cell. The design resulted in a 58× reduction in H 2 crossover compared to parallel plate electrodes at the same operating conditions . Gillespie et al studied hydrogen generation performance in membraneless divergent-electrode- flow-through alkaline electrolyzers. , …”

Section: Devices and Applicationsmentioning

confidence: 99%

“…The design resulted in a 58× reduction in H 2 crossover compared to parallel plate electrodes at the same operating conditions. 273 Gillespie et al studied hydrogen generation performance in membraneless divergentelectrode-flow-through alkaline electrolyzers. 274,275 Furthermore, the mixed-media operation scheme may also be employed in microfluidic electrolyzers.…”

Section: Electrolytic Cellsmentioning

confidence: 99%

Microfluidics for Electrochemical Energy Conversion

et al. 2022

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Electrochemical energy conversion is an important supplement for storage and on-demand use of renewable energy. In this regard, microfluidics offers prospects to raise the efficiency and rate of electrochemical energy conversion through enhanced mass transport, flexible cell design, and ability to eliminate the physical ion-exchange membrane, an essential yet costly element in conventional electrochemical cells. Since the 2002 invention of the microfluidic fuel cell, the research field of microfluidics for electrochemical energy conversion has expanded into a great variety of cell designs, fabrication techniques, and device functions with a wide range of utility and applications. The present review aims to comprehensively synthesize the best practices in this field over the past 20 years. The underlying fundamentals and research methods are first summarized, followed by a complete assessment of all research contributions wherein microfluidics was proactively utilized to facilitate energy conversion in conjunction with electrochemical cells, such as fuel cells, flow batteries, electrolysis cells, hybrid cells, and photoelectrochemical cells. Moreover, emerging technologies and analytical tools enabled by microfluidics are also discussed. Lastly, opportunities for future research directions and technology advances are proposed.

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“…high electrolyzer lifetimes, high efficiencies, reduced hydrogen production costs, and low maintenance expenditures. 3,4 Protonexchange membrane-based water electrolyzers (PEMWEs) have been commercialized and show excellent performance in ultrapure water due to a high conversion efficiency (up to 70%). [5][6][7] However, PEMWEs rely on expensive precious-metal catalysts (IrO 2 and Pt) and peruorinated membranes and result in a high cost of water electrolyzer devices.…”

Section: Introductionmentioning

confidence: 99%

Dimensionally stable multication-crosslinked poly(arylene piperidinium) membranes for water electrolysis

Wang

Lammertink

2022

J. Mater. Chem. A

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A membrane-less electrolyzer with porous walls for high throughput and pure hydrogen production

Abstract: Membrane-less electrolyzers utilize fluidic forces instead of solid barriers for the separation of the electrolysis gas products. These electrolyzers have low ionic resistance, simple design, and the ability to work...

Cited by 34 publications

References 61 publications

The Influence of Transitional Metal Dopants on Reducing Chlorine Evolution during the Electrolysis of Raw Seawater

The Influence of Transitional Metal Dopants on Reducing Chlorine Evolution during the Electrolysis of Raw Seawater

Microfluidics for Electrochemical Energy Conversion

Dimensionally stable multication-crosslinked poly(arylene piperidinium) membranes for water electrolysis

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