Catalytic electrode comprising a gas diffusion layer and bubble-involved mass transfer in anion exchange membrane water electrolysis: A critical review and perspectives

Journal of Energy Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 1, 2025

Language: Английский

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Molecular Weight Engineering Modulates Lignin‐Metal Supramolecular Framework to Construct Carbon‐Coated CoRu Alloy for Effective Overall Water Splitting

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 25, 2025

Abstract To overcome the challenges of low catalytic activity and instability, a molecular weight engineering strategy coupled with oxidative ammonolysis is developed to synthesize CoRu‐based alloy catalysts distinct morphologies properties from biorefinery lignin. This approach effectively modulates intrinsic active sites exposes unsaturated nitrogen‐oxygen structures, thereby tailoring morphology defect structure carbon layers in catalysts. The as‐synthesized CoRu lignin precursors varying weights are designated as CoRu@OALC‐EtOAC, CoRu@OALC‐EtOH, CoRu@OALC‐Residual. featuring defect‐rich graphitic carbon‐coated structure, exhibited exceptional overall water‐splitting performance (1.48 V at 10 mA cm −2 ), significantly surpassing Pt/C || Ru/C (1.58 ). In contrast, CoRu@OALC‐Residual, its amorphous demonstrated remarkable stability (350 h 100 vastly outperforming (6 In‐situ Raman spectroscopy DFT calculations revealed that adsorb * H intermediates, accelerating process. strong adsorption also induces layer rearrangement, leading dissolution oxidation metal particles. provides universal method for biomass‐derived catalysts, establishing direct relationship between weight, catalyst morphology, electrocatalytic performance.

Language: Английский

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5-Hydroxymethylfurfural Oxidation in Scaled Anion Exchange Membrane Electrolyzer with NiCuO_x Catalyst

ACS Energy Letters, Journal Year: 2025, Volume and Issue: 10(1), P. 571 - 578

Published: Jan. 2, 2025

The utilization of anion exchange membrane (AEM) electrolyzers presents an opportunity for commercial production 2,5-furandicarboxylic acid (FDCA) through electrochemical oxidation 5-hydroxymethylfurfural (HMF). Consequently, developing facile synthesis techniques scaled-up electrocatalysts HMF reaction (HMFOR) is a crucial step. Herein, we developed one-step soaking method preparing 100 cm2 NiCu-based catalyst on Ni foam (NiCuOx/NF) in 10 s. In single-pass 25 AEM electrolyzer assembled by the obtained catalyst, high yield ≥95.0% and selectivity ≥99.9% were achieved to produce FDCA continuously with 200 mM electrolyte. After h stable operation at A, 207.28 g was attained purity over 99%. This work provides valuable insights into industrial-scale commercialization biomass upgrading electrolyzers.

Language: Английский

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Enhancing Water Electrolysis Performance by Bubble Behavior Management

Small Methods, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 16, 2025

Abstract Electrocatalytic water splitting for hydrogen generation plays a crucial role in promoting the energy transition and achieving goals of carbon neutrality. Nevertheless, context electrolysis, generated bubbles have an adverse impact on consumption mass transfer efficiency. To address this challenge, variety strategies are investigated to accelerate bubble detachment transport. It is utmost significance summarize those facilitating advancement electrolysis performance. In review, comprehensive account presented enhancing performance through behavior management. First, electrolyte discussed. Then, optimized interactions between electrode surface introduced, which focus reducing adhesion forces implementing other forces. Next, dynamic bubbling deformable catalysts discussed, such as fern‐ caterpillar‐like catalysts. Following that, bubble‐bubble coalescence proved be beneficial earlier departure compared buoyancy effect alone. Finally, outlooks future development efficient removal enhanced The review aims deepen comprehension stimulate management strategies, thereby further electrolysis.

Language: Английский

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Manipulating Boiling Bubble Dynamics on Under‐Liquid Superaerophobic Silicon Surfaces for High‐Performance Phase‐Change Cooling

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 5, 2025

Abstract Enhancing critical heat flux (CHF) and transfer coefficient (HTC) by promoting the nucleation, growth, departure of boiling bubbles has drawn significant attention owing to its wide applications. However, in‐depth understanding comprehensive manipulation under‐liquid bubble dynamics from in situ microscale perspectives remain challenging. Herein, observations analyses microsized ultra‐low surface tension fluorinated liquids (FLs) are conducted on superaerophobic silicon surfaces with crisscross microchannels selective nanowires. It is revealed that deep yet short nanowires enable ultrafast liquid spreading (<549.6 ms) ultralow adhesion (≈1.1 µN), while an appropriate spacing (240–600 µm) between minimizes time (<20.6 due timely coalescence. By verifying above principles through collaborative enhancement CHF HTC, optimized structure (microchannel depth ≈52.9 µm, microchannel ≈362.9 nanowire length ≈0 nm) obtained further implemented onto exposed Si a commercial CPU chip. Cooled phase‐change FLs, average temperature maintains ≈64.9 °C even under extreme power loads (≈130 W), far below than those conventional air‐cooling water‐cooling operations.

Language: Английский

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Enhancing Water Electrolysis through Interfacial Design of Nickel Foam

Langmuir, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 10, 2025

Water electrolysis recognizes nickel foam (NF) as an effective current collector due to its excellent conductivity. However, recent studies highlighted NF's effect on the efficacy of various electrocatalytic reactions, primarily presence electroactive chemical species at interface. In contrast, numerous reports suggested that NF has a negligible impact overall activity. When evaluated against other collectors, NF-supported catalysts demonstrate better electrochemical activity, predominantly interfacial design. This study presents electrochemically relevant with flexible design, supported by case and insights into promising future directions. Perspective reveals advantages, challenges, applicability design context water splitting in mind.

Language: Английский

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Porous Transport Layers for Anion Exchange Membrane Water Electrolysis: The Impact of Morphology and Composition

ACS electrochemistry., Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 7, 2025

Anion exchange membrane water electrolysis (AEMWE) is an emerging technology for the low-cost production of hydrogen. However, efficiency and durability AEMWE devices currently insufficient to compete with other low-temperature technologies. The porous transport layer (PTL) a critical cell component that remains relatively unoptimized AEMWE. In this study, we demonstrate device performance significantly affected by morphology composition PTL. For Ni fiber-based PTLs ∼2 μm Co3O4 oxygen evolution reaction catalyst layer, decreasing pore size porosity resulted in 20% increase current density at 2 V 1 M KOH supporting electrolyte. Alloy even lower had higher performance; particular, stainless steel PTL gave 80% relative Ni. Without Co3O4, alloy still demonstrated high activity, indicating material was catalytically active. characterization electrode electrolyte after testing indicated also underwent restructuring corrosion processes may limit long-term stability. This study demonstrates design improved important area focus achieve targets.

Language: Английский

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Rice leaves microstructure-inspired high-efficiency electrodes for green hydrogen production

Nanoscale, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Rice leaves inspired the development of an anisotropic microstructured gas conduction electrode featuring rapid desorption and transfer bubbles to achieve highly efficient hydrogen production.

Language: Английский

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Bubble Dynamics during Hydrogen Evolution Reaction over Fluidizable Electrocatalyst Particles

Industrial & Engineering Chemistry Research, Journal Year: 2025, Volume and Issue: 64(9), P. 5087 - 5098

Published: Feb. 21, 2025

Gas bubble adhesion, a ubiquitous phenomenon in electrochemical gas-evolving reactions, reduces the hydrogen evolution reaction (HER) activity water electrolysis. Understanding dynamics of gas detachment and its dependence on force balance is crucial for manipulating departure, but it remains insufficiently investigated. Here, we found that differ markedly between fluidizable stationary electrocatalysts, with electrocatalysts minimizing adhesion showing 37-fold increase HER rate constant. This enhancement attributed to accelerated driven by fluidization effect electrocatalyst particles. Specifically, transition from marks shift flat particulate model, introducing promoting effects arising particle movement spin-induced centrifugal collision-triggered coalescence. Consequently, measured approaches intrinsic value. work highlights as an effective strategy eliminate thereby exposing nearly all active sites electrocatalytic reactions.

Language: Английский

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Boosting Electrocatalytic Hydrogenation of Phenylacetylene via Accelerating Water Electrolysis on a Cr-Cu₂O Surface

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 8, 2025

Electrochemical alkyne reduction with H2O as a hydrogen source represents sustainable route for value-added olefin production. However, the reaction efficiency is hampered by high voltage and low activity of Cu electrodes due to their weak adsorbed (*H) generation property. In this article, we present enhanced electrocatalysis phenylacetylene styrene over highly dispersive Cr-doped Cu2O nanowire (Cr-Cu2O) cathode. The Cr-Cu2O demonstrates improved catalytic compared pure Cu2O, achieving conversion about 94.7% selectivity 87.9% Faraday 64.5% at potential −1.15 V vs Hg/HgO. combination electrochemical characterization techniques theoretical calculations demonstrated key role introduced Cr atoms in lowering activation energy barrier surface water electrolysis *H facilitating adsorption phenylacetylene, which promotes effective hydrogenation via an electrocatalytic mechanism. short, work provides feasible strategy enrich interfacial *H, thus improving semihydrogenation performance phenylacetylene.

Language: Английский

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