<i>In situ</i> investigation of ion exchange membranes reveals that ion transfer in hybrid liquid/gas electrolyzers is mediated by diffusion, not electromigration

Ralaiarisoa, Maryline; Krishnamurti, Senapati Sri; Gu, Wenqing; Ampelli, Claudio; van de Krol, Roel; Abdi, Fatwa Firdaus; Favaro, Marco

doi:10.1039/d3ta02050a

Cited by 3 publications

(2 citation statements)

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“…In a recent study, ionexchange membranes were investigated in a hybrid liquid/gas (photo)electrolyzer, utilizing a combination of in situ NAP-HAXPES and finite-element analysis. [341] The obtained results reveal that the preferential ion movement across the membrane which separates the liquid and gas compartments is predominantly governed by diffusion driven by the ionized functional groups embedded in the membranes, rather than electromigration. Moreover, the presence of undesired polarization fields at the interface between the liquid electrolyte and the polymer membrane was detected.…”

Section: Challenge No 5: Design and Characterization Of Complex Multi...mentioning

confidence: 87%

“…The occurrence of these polarization fields is contingent upon the polarity of the applied bias and the electric charge of the ions rejected by the membranes. [341] Consequently, these losses lead to an increase of the cell voltage, thereby negatively influencing the overall efficiency and reaction selectivity of hybrid liquid/gas (photo)electrolyzers. This comprehensive understanding aids in devising effective strategies to mitigate the effect of these phenomena, ultimately maximizing the device performance.…”

Section: Challenge No 5: Design and Characterization Of Complex Multi...mentioning

confidence: 99%

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Integration of Multijunction Absorbers and Catalysts for Efficient Solar‐Driven Artificial Leaf Structures: A Physical and Materials Science Perspective

Hannappel,

Shekarabi,

Jaegermann

et al. 2024

Solar RRL

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Artificial leaves could be the breakthrough technology to overcome the limitations of storage and mobility through the synthesis of chemical fuels from sunlight, which will be an essential component of a sustainable future energy system. However, the realization of efficient solar‐driven artificial leaf structures requires integrated specialized materials such as semiconductor absorbers, catalysts, interfacial passivation, and contact layers. To date, no competitive system has emerged due to a lack of scientific understanding, knowledge‐based design rules, and scalable engineering strategies. Here, we will discuss competitive artificial leaf devices for water splitting, focusing on multi‐absorber structures to achieve solar‐to‐hydrogen conversion efficiencies exceeding 15%. A key challenge is integrating photovoltaic and electrochemical functionalities in a single device. Additionally, optimal electrocatalysts for intermittent operation at photocurrent densities of 10‐20 mA cm‐2 must be immobilized on the absorbers with specifically designed interfacial passivation and contact layers, so‐called buried junctions. This minimizes voltage and current losses and prevents corrosive side reactions. Key challenges include understanding elementary steps, identifying suitable materials, and developing synthesis and processing techniques for all integrated components. This is crucial for efficient, robust, and scalable devices. Here, we discuss and report on corresponding research efforts to produce green hydrogen with unassisted solar‐driven (photo‐)electrochemical devices.This article is protected by copyright. All rights reserved.

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Section: Challenge No 5: Design and Characterization Of Complex Multi...mentioning

confidence: 87%

Section: Challenge No 5: Design and Characterization Of Complex Multi...mentioning

confidence: 99%

Integration of Multijunction Absorbers and Catalysts for Efficient Solar‐Driven Artificial Leaf Structures: A Physical and Materials Science Perspective

Hannappel,

Shekarabi,

Jaegermann

et al. 2024

Solar RRL

Self Cite

View full text Add to dashboard Cite

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On optimizing the experimental setup for estimation of the thermal conductivity of thin films

Barragán,

Pastuschuk,

Maroto

et al. 2024

J Therm Anal Calorim

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The aim of this study is to show the optimal arrangement of a measurement system for estimating the thermal conductivity of thin films from temperature profiles. For this purpose, two different experimental setup systems, with square and circular cross sections, were designed to estimate the thermal conductivity of thin films and, in particular, of two ion exchange membranes. Both systems were placed horizontally and vertically in order to evaluate the best orientation to more accurately determine thermal conductivity. A three-dimensional numerical simulation was performed using Comsol Multiphysics to predict the heat flow and temperature gradient and to evaluate the effect of the geometry and the orientation on the contact resistances. Each system was first calibrated without the membrane inside in order to estimate all the necessary thermal properties of the different materials of the model. Next, the membrane was placed inside the model, so that the model now includes the thermal conductivity of the membrane as the only unknown parameter. The numerical results were compared with the various measured temperature profiles to estimate the thermal conductivity. The thermal conductivity values of the well-known Nafion 117 membrane and other thicker membrane were determined. A very good agreement with reliable literature values was obtained. The approach presented here, combining experimental and simulated temperature profiles, may provide the basis for a practical alternative to better estimate the thermal conductivity of thin films.

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Machine learning-assisted equivalent circuit identification for dielectric spectroscopy of polymers

Albakri,

Diniz,

Benner

et al. 2024

Electrochimica Acta

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In situ investigation of ion exchange membranes reveals that ion transfer in hybrid liquid/gas electrolyzers is mediated by diffusion, not electromigration

Abstract: In this study, commercially available cation- and anion-exchange membranes were investigated in hybrid liquid/gas electrolyzers by coupling in situ ambient pressure hard X-ray photoelectron spectroscopy with finite element analysis.

Cited by 3 publications

References 89 publications

Integration of Multijunction Absorbers and Catalysts for Efficient Solar‐Driven Artificial Leaf Structures: A Physical and Materials Science Perspective

Integration of Multijunction Absorbers and Catalysts for Efficient Solar‐Driven Artificial Leaf Structures: A Physical and Materials Science Perspective

On optimizing the experimental setup for estimation of the thermal conductivity of thin films

Machine learning-assisted equivalent circuit identification for dielectric spectroscopy of polymers

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