Hierarchical superhydrophilic/superaerophobic 3D porous trimetallic (Fe, Co, Ni) spinel/carbon/nickel foam for boosting oxygen evolution reaction

Applied Catalysis B Environment and Energy, Год журнала: 2023, Номер 332, С. 122717 - 122717

Опубликована: Апрель 14, 2023

Язык: Английский

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Opportunities of Ionomer Development for Anion-Exchange Membrane Water Electrolysis

ACS Energy Letters, Год журнала: 2023, Номер 8(8), С. 3330 - 3342

Опубликована: Июль 25, 2023

Anion-exchange membrane water electrolysis (AEM-WE) promises low cost, green hydrogen production for the future. In order to meet this potential, significant improvements performance and stability of catalyst layers (CLs) must be made, including development tailor-made ion conducting polymer materials. This Focus Review outlines role anion-exchange ionomers (AEIs) in CLs enabling activation, enhancing toward delamination, improving conduction. Detrimental effects such as inhibition evolution reaction (HER) oxygen (OER) oxidative instability ionomer are also discussed with key findings from recent AEM-WE literature. Opportunities future guide efforts.

Язык: Английский

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Hydrazine‐Assisted Acidic Water Splitting Driven by Iridium Single Atoms

Advanced Science, Год журнала: 2023, Номер 10(32)

Опубликована: Сен. 29, 2023

Abstract Water splitting, an efficient technology to produce purified hydrogen, normally requires high cell voltage (>1.5 V), which restricts the application of single atoms electrocatalyst in water oxidation due inferior stability, especially acidic environment. Substitution anodic oxygen evolution reaction (OER) with hydrazine (HzOR) effectually reduces overall voltage. In this work, utilization iridium atom (Ir‐SA/NC) as robust hydrogen (HER) and HzOR 0.5 m H 2 SO 4 electrolyte is reported. Mass activity Ir‐SA/NC 37.02 A mg Ir −1 at overpotential 50 mV HER catalysis, boosted by 127‐time than Pt/C. Besides, only 0.39 V versus RHE attain 10 mA cm −2 dramatically lower OER (1.5 RHE); importantly, a superior stability achieved HzOR. Moreover, mass enhanced 83‐fold The situ Raman spectroscopy investigation suggests pathway follows *N →*2NH →*2NH→2N→*N →N for Ir‐SA/NC. assisted splitting demands drive, 1.25 splitting.

Язык: Английский

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Performance Enhancement of Electrocatalytic Hydrogen Evolution through Coalescence-Induced Bubble Dynamics

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(14), С. 10177 - 10186

Опубликована: Март 27, 2024

The evolution of electrogenerated gas bubbles during water electrolysis can significantly hamper the overall process efficiency. Promoting departure electrochemically generated (water) is therefore beneficial. For a single bubble, from electrode surface occurs when buoyancy wins over downward-acting forces (e.g., contact, Marangoni, and electric forces). In this work, dynamics pair H2 produced hydrogen reaction in 0.5 M H2SO4 using dual platinum microelectrode system systematically studied by varying distance cathodic potential. By combining high-speed imaging electrochemical analysis, we demonstrate importance bubble–bubble interactions process. We show that bubble coalescence may lead to substantially earlier as compared effects alone, resulting considerably higher rates at constant However, due continued mass input conservation momentum, repeated events with close drive departed back beyond critical current, which increases spacing. latter leads resumption growth near surface, followed buoyancy-driven departure. While less favorable small spacing, configuration proves be very beneficial larger separations, increasing mean current up 2.4 times under conditions explored study.

Язык: Английский

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A review on understanding and identifying degradation mechanisms in PEM water electrolysis cells: Insights for stack application, development, and research

International Journal of Hydrogen Energy, Год журнала: 2024, Номер 65, С. 381 - 397

Опубликована: Апрель 7, 2024

This review, addressing developers, users, and researchers of PEM water electrolysis stacks, provides a detailed overview the most important degradation mechanisms, underlying influencing factors, resulting impact on system component degradation. By investigating significance consequences mechanisms stack performance life-time, it comprehensive understanding challenges impacts associated with technology. Possible qualitative quantitative statements based observed phenomena single cell level as well from ex-situ examinations are evaluated. The common diagnostic tools, electrochemical, imaging, physical analysis methods, elemental structural described in an application-oriented manner regarding their advantages, possibilities, limits.

Язык: Английский

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Gas Evolution in Water Electrolysis

Chemical Reviews, Год журнала: 2024, Номер unknown

Опубликована: Сен. 11, 2024

Gas bubbles generated by the hydrogen evolution reaction and oxygen during water electrolysis influence energy conversion efficiency of production. Here, we survey what is known about interaction gas electrode surfaces on practicable devices used for electrolysis. We outline physical processes occurring life cycle a bubble, summarize techniques to characterize phenomena in situ practical device environments, discuss ways that electrodes can be tailored facilitate removal at high current densities. Lastly, review efforts model behavior individual multiphase flows produced gas-evolving electrodes. conclude our with short summary outstanding questions could answered future electrochemical environments or improved simulations flows.

Язык: Английский

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Engineering redox-active electrochemically mediated carbon dioxide capture systems

Nature Chemical Engineering, Год журнала: 2024, Номер 1(1), С. 35 - 44

Опубликована: Янв. 11, 2024

Язык: Английский

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Tip and heterogeneous effects co-contribute to a boosted performance and stability in zinc air battery

Journal of Colloid and Interface Science, Год журнала: 2024, Номер 662, С. 676 - 685

Опубликована: Фев. 15, 2024

Язык: Английский

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Advancing H₂O₂ electrosynthesis: enhancing electrochemical systems, unveiling emerging applications, and seizing opportunities

Chemical Society Reviews, Год журнала: 2024, Номер 53(16), С. 8137 - 8181

Опубликована: Янв. 1, 2024

Hydrogen peroxide (H

Язык: Английский

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Rational design of local microenvironment for electrocatalytic water splitting

Inorganic Chemistry Frontiers, Год журнала: 2024, Номер 11(14), С. 4080 - 4106

Опубликована: Янв. 1, 2024

This summary describes the effects of wettability, local pH, interfacial water structure, and electrolyte composition on interface reactant compositions, key intermediate adsorption, reaction kinetics.

Язык: Английский

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