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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Surface Redox Chemistry Regulates the Reaction Microenvironment for Efficient Hydrogen Peroxide Generation

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(22), С. 15356 - 15365

Опубликована: Май 22, 2024

Electrosynthesis has emerged as an enticing solution for hydrogen peroxide (H2O2) production. However, efficient H2O2 generation encounters challenges related to the robust gas–liquid–solid interface within electrochemical reactors. In this work, we introduce effective hydrophobic coating modified by iron (Fe) sites optimize reaction microenvironment. This modification aims mitigate radical corrosion through Fe(II)/Fe(III) redox chemistry, reinforcing microenvironment at three-phase interface. Consequently, achieved a remarkable yield of up 336.1 mmol h–1 with sustained catalyst operation extensive duration 230 h 200 mA cm–2 without causing damage Additionally, Faradaic efficiency exceeded 90% across broad range test current densities. surface chemistry approach manipulating not only advances long-term electrosynthesis but also holds promise other gas-starvation reactions.

Язык: Английский

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Microenvironment Engineering of Heterogeneous Catalysts for Liquid-Phase Environmental Catalysis

Chemical Reviews, Год журнала: 2024, Номер 124(20), С. 11348 - 11434

Опубликована: Окт. 9, 2024

Environmental catalysis has emerged as a scientific frontier in mitigating water pollution and advancing circular chemistry reaction microenvironment significantly influences the catalytic performance efficiency. This review delves into engineering within liquid-phase environmental catalysis, categorizing microenvironments four scales: atom/molecule-level modulation, nano/microscale-confined structures, interface surface regulation, external field effects. Each category is analyzed for its unique characteristics merits, emphasizing potential to enhance efficiency selectivity. Following this overview, we introduced recent advancements advanced material system design promote (e.g., purification, transformation value-added products, green synthesis), leveraging state-of-the-art technologies. These discussions showcase was applied different reactions fine-tune regimes improve from both thermodynamics kinetics perspectives. Lastly, discussed challenges future directions engineering. underscores of intelligent materials drive development more effective sustainable solutions decontamination.

Язык: Английский

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A carbon membrane-aerated electrochemical reactor for efficient electrosynthesis of H2O2

Chemical Engineering Journal, Год журнала: 2025, Номер unknown, С. 159609 - 159609

Опубликована: Янв. 1, 2025

Язык: Английский

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Low-Cost, Facile, and Scalable Manufacturing of Single-Molecule-Integrated Catalytic Electrodes

ACS Nano, Год журнала: 2025, Номер unknown

Опубликована: Март 12, 2025

To surmount the shortcomings of powder-based catalysts and small electrode sizes, development meter-scale integrated materials is essential for practical electrocatalytic applications, which requires fine control over effective surface grafting catalytic active sites on large-size electrodes as well addressing challenge balancing cost-effective large-scale manufacturing with highly stable operation. Herein, we report a low-cost, facile, scalable method directly constructing single-molecule-integrated using commercially available, flexible, size-tailored conductive carbon textiles (e.g., graphite felt) well-defined planar conjugated molecules metallophthalocyanines) via heterostacking steered cross-scale heterointerfacial assembly. This universal unlocks limitations traditional approaches that involve integrating catalysts, particles, binders Nafion), supported paper) through multiple processing steps typically result in centimeter-level electrodes. Meaningfully, our enables precise size, composition, microenvironment, structure to match various environments. As proof concept, an thiophene-gilded cobalt phthalocyanine demonstrates outstanding activity stability CO2 electroconversion alkaline, neutral, acidic media under industrially relevant current densities, even flowing paired-electrolysis system. study provides comprehensive scientific data engineering guidance systematic design scalable, binder-free electrodes, thereby promising drive sustainable energy-efficient electrolysis industrial scene.

Язык: Английский

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Recent Progress in Oxygen Reduction Reaction Toward Hydrogen Peroxide Electrosynthesis and Cooperative Coupling of Anodic Reactions

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 13, 2025

Abstract Electrosynthesis of hydrogen peroxide (H 2 O ) via two‐electron oxygen reduction reaction (2e − ORR) is a promising alternative to the anthraquinone oxidation process. To improve overall energy efficiency and economic viability this catalytic process, one pathway develop advanced catalysts decrease overpotential at cathode, other couple 2e ORR with certain anodic reactions full cell voltage while producing valuable chemicals on both electrodes. The performance catalyst depends not only material itself but also environmental factors. Developing electrocatalysts high selectivity activity prerequisite for efficient H electrosynthesis, coupling appropriate would further enhance efficiency. Considering this, here comprehensive review presented latest progress state‐of‐the‐art in different media, microenvironmental modulation mechanisms beyond design, as well electrocatalytic system various reactions. This presents new insights regarding existing challenges opportunities within rapidly advancing field, along viewpoints future development electrosynthesis construction green roadmaps.

Язык: Английский

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Molecular-Level Tuning of Active Sites of the Carbonaceous Catalyst for Boosting Electrochemical H₂O₂ Production and its Application in Electro-Fenton-like Degradation of Organics

ACS ES&T Engineering, Год журнала: 2024, Номер 4(7), С. 1690 - 1701

Опубликована: Май 16, 2024

Constructing effective cathode materials for simultaneously producing and activating H2O2 to achieve functional reduction of O2 •OH production is crucial the development a heterogeneous electro-Fenton process in wastewater treatment. In this study, active groups carbonaceous catalyst electrochemical have been tuned identified from molecular level. Proton amines pyrolysis temperature present significant influences on polymerization phenolic-formaldehyde resin, thereby altering structure, groups, defects, activity carbonized catalyst. A graphite felt-based gas-diffusion electrode composed catalyst, organic binder, transition metal species has employed electron-Fenton-like system highly selective water decontamination. The optimized exhibits high selectivity 87.6–92.4% at 0.2–0.4 V vs standard hydrogen (SHE), higher current efficiency 99.1%, rate 6.29 mg cm–2 h–1 10 mA cm–2, respectively. Furthermore, owing efficient decomposition into by Mnn+ species, humic acid can be efficiently degraded an process. oxidation performance energy consumption treatment real landfill leachate evaluated. results demonstrate that relational design fabrication high-performance based regulating activation huge potential

Язык: Английский

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Review of H2O2 generation from O2 electroreduction by gas diffusion electrodes: From homogeneous to heterogeneous electrocatalysis

Journal of Electroanalytical Chemistry, Год журнала: 2024, Номер 974, С. 118700 - 118700

Опубликована: Окт. 5, 2024

Язык: Английский

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Species mass transfer governs the selectivity of gas diffusion electrodes toward H2O2 electrosynthesis

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Дек. 5, 2024

The meticulous design of advanced electrocatalysts and their integration into gas diffusion electrode (GDE) architectures is emerging as a prominent research paradigm in the H2O2 electrosynthesis community. However, it remains perplexing that assembled GDE frequently exhibit substantial discrepancies selectivity during bulk electrolysis. Here, we elucidate pivotal role mass transfer behavior key species (including reactants products) beyond intrinsic properties electrocatalyst dictating electrode-scale selectivity. This tendency becomes more pronounced high reaction rate (current density) regimes where transport limitations are intensified. By utilizing diffusion-related parameters (DRP) GDEs (i.e., wettability catalyst layer thickness) probe factors, employ both short- long-term electrolysis conjunction with in-situ electrochemical reflection-absorption imaging theoretical calculations to thoroughly investigate impact DRP DRP-controlled local microenvironments on O2 transfer. mechanistic origins diffusion-dependent conversion at scale unveiled accordingly. fundamental insights gained from this study underscore necessity architectural innovations for mainstream hydrophobic can synchronously optimize products, paving way next-generation gas-consuming electroreduction scenarios. Electrocatalysts electrodes electrosynthesis. authors report

Язык: Английский

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Stability challenges of transition metal-modified cathodes for electro-Fenton process: A mini-review

Chemosphere, Год журнала: 2025, Номер 373, С. 144159 - 144159

Опубликована: Янв. 30, 2025

Язык: Английский

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