Current status of membraneless water electrolysis cells

Swiegers, Gerhard F.; Hoang, Anh Linh; Hodges, Aaron; Tsekouras, George; Lee, Chong; Wagner, Klaudia; Wallace, Gordon G.

doi:10.1016/j.coelec.2021.100881

Cited by 21 publications

(21 citation statements)

References 19 publications

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“…In the absence of diaphragms, mechanical forces in the flow field can be utilized as another tool for separating generated gas bubbles, and current separator-free electrolysis methods can be categorized into two groups according to their specific structure design: laminar flow cells and divergent electrode flow-through (DEFT) cells. 104,105 When high-speed laminar flow is applied between two parallel flat plates, the particles inside are simultaneously affected by a force facing toward the wall derived from velocity gradients across their bodies and a force facing the center of the flow field induced by high near-wall pressure. As a consequence of their structural deformability, nonrigid entities such as bubbles and droplets receive an additional lifting force directed away from the wall, and their equilibrium positions are jointly determined by these effects.…”

Section: Innovative Strategiesmentioning

confidence: 99%

Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

et al. 2023

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Since severe global warming and related climate issues have been caused by the extensive utilization of fossil fuels, the vigorous development of renewable resources is needed, and transformation into stable chemical energy is required to overcome the detriment of their fluctuations as energy sources. As an environmentally friendly and efficient energy carrier, hydrogen can be employed in various industries and produced directly by renewable energy (called green hydrogen). Nevertheless, large-scale green hydrogen production by water electrolysis is prohibited by its uncompetitive cost caused by a high specific energy demand and electricity expenses, which can be overcome by enhancing the corresponding thermodynamics and kinetics at elevated working temperatures. In the present review, the effects of temperature variation are primarily introduced from the perspective of electrolysis cells. Following an increasing order of working temperature, multidimensional evaluations considering materials and structures, performance, degradation mechanisms and mitigation strategies as well as electrolysis in stacks and systems are presented based on elevated temperature alkaline electrolysis cells and polymer electrolyte membrane electrolysis cells (ET-AECs and ET-PEMECs), elevated temperature ionic conductors (ET-ICs), protonic ceramic electrolysis cells (PCECs) and solid oxide electrolysis cells (SOECs).

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Section: Innovative Strategiesmentioning

confidence: 99%

Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

et al. 2023

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“…Membranes are one of the challenges in electrolysis, due to their rapid degradation, which is why MEs are planned as a prominent alternative with low cost and enhanced lifespan. With first membraneless electrolysis cell patent in 2008, and scientific publications from 2015, 227 maximum efficiency of ME cells range between 64% and 82%, comparable to current alkaline electrolyzers. The main challenge of the technology focuses on the electrodes, and on finding a balance between their porosity and conductivity 228,229 …”

Section: Sun Heat and Electricity For Water Splitting‐based Hydrogen ...mentioning

confidence: 99%

Sun, heat and electricity. A comprehensive study of non‐pollutant alternatives to produce green hydrogen

Mancera

Segura

Andújar

et al. 2022

Intl J of Energy Research

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Summary Water‐based hydrogen production is currently an attractive research field, as it provides a greener method to produce hydrogen than existing alternatives. Green hydrogen is expected to progressively replace fossil fuels, which are highly harmful environmentally. This paper presents a critical analysis over time of the main water splitting technologies currently in use for sustainable hydrogen production. As a result of the critical analysis, all the studied techniques have been ordered chronologically in the way that it is possible to understand how new materials have driven to new techniques, more efficient and less expensive. This allows having a complete vision of these technologies. A high level of maturity has been reached in electrolysis, while other techniques still have a long way to go, although many improvements and relevant advancements have been made over the years. The paper offers a global and comparative vision of each technology. From this, it is possible to identify the different paths where efforts are needed to make water‐based hydrogen production a mature, stable and efficient technology.

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“…New advances include the development of membraneless alkaline electrolysis systems that do not require an inter-electrode separator. 3 Electrolysis cells comprising two porous gas diffusion electrodes that use capillary effects to directly extract the generated gases through the electrodes without visible bubble formation have also been developed. 3–7 Most recently, an innovative ‘capillary-fed’ alkaline electrolysis cell, which offers the promise of a breakthrough energy efficiency, has been described.…”

Section: Introductionmentioning

confidence: 99%

“…3 Electrolysis cells comprising two porous gas diffusion electrodes that use capillary effects to directly extract the generated gases through the electrodes without visible bubble formation have also been developed. 3–7 Most recently, an innovative ‘capillary-fed’ alkaline electrolysis cell, which offers the promise of a breakthrough energy efficiency, has been described. 8 These efforts necessarily involve developing high-performing electrocatalysts for the oxygen-evolution reaction (OER) (at the anode in a water electrolysis cell) and the hydrogen-evolution reaction (HER) (at the cathode in a water electrolysis cell).…”

Section: Introductionmentioning

confidence: 99%

High-performing catalysts for energy-efficient commercial alkaline water electrolysis

Hoang

Balakrishnan

Hodges

et al. 2023

Sustainable Energy Fuels

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Current status of membraneless water electrolysis cells

Cited by 21 publications

References 19 publications

Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

Sun, heat and electricity. A comprehensive study of non‐pollutant alternatives to produce green hydrogen

High-performing catalysts for energy-efficient commercial alkaline water electrolysis

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