Recent advances in H2O2 electrosynthesis based on the application of gas diffusion electrodes: Challenges and opportunities

Santos, Géssica de Oliveira Santiago; Cordeiro-Junior, Paulo Jorge Marques; Sánchez-Montes, Isaac; Souto, Robson  Silva; Kronka, Matheus S.; Lanza, Marcos R. V.

doi:10.1016/j.coelec.2022.101124

Cited by 18 publications

(17 citation statements)

References 67 publications

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“…Nevertheless, for practical applications, the GDE lifetime of ∼1000 h is still insufficient and needs to be considerably extended. 6 A possible solution is to increase the backpressure of GDEs to push the TPI inside the GDE more toward the liquid phase, which may help maintain a stable TPI inside the GDE and thus extend the lifetime of GDE. 32 Based on the mass of H 2 O 2 produced within the GDE lifetime during the multicycle experiments, the capital cost of GDE, DSA, and CEM for H 2 O 2 production was calculated according to eq 8 (Table 1, see Table S4 for detailed calculations).…”

Section: Stability and Capital Cost Of Gdementioning

confidence: 99%

“…Among the various electrode configurations for H 2 O 2 electrosynthesis, carbon-based gas diffusion electrodes (GDEs) are generally considered the most suitable for scale-up applications. − GDEs consist of a gas diffusion layer and a catalysis layer that face to a gas chamber/atmosphere and water, respectively. During H 2 O 2 electrosynthesis, O 2 in the gas chamber/atmosphere diffuses through micropores of the diffusion layer to the catalysis layer, where it reacts with protons from the water and electrons from the electrode to form H 2 O 2 (eq ).…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, this hypothesis has yet to be verified. Although some studies have claimed that GDEs have a high stability for H 2 O 2 electrosynthesis, the timeframe of the experiments are usually only a few minutes to several tens of hours, which is obviously too short to draw convincing conclusions. , Moreover, the change from the single-reactor system to the dual-reactor system will influence many aspects of H 2 O 2 electrosynthesis and water treatment. The economic competitiveness and technical feasibility of this new approach have yet to be systematically evaluated to reveal its opportunities and limitations when applied in the field.…”

Section: Introductionmentioning

confidence: 99%

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Technoeconomic Assessment of Electrochemical Hydrogen Peroxide Production with Gas Diffusion Electrodes under Scenarios Relevant to Practical Water Treatment

Zhao,

Xia,

et al. 2023

ACS EST Eng.

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Recent studies have shown that electrochemically producing hydrogen peroxide (H2O2) with gas diffusion electrodes (GDEs) directly in the water to be treated by H2O2-based advanced oxidation processes (AOPs) is problematic in practical applications because of the quick deterioration of GDE stability by oxidation with strong oxidants (e.g., hydroxyl radicals) and fouling by complex water constituents (e.g., Ca2+ and Mg2+). Therefore, this study tested the electrosynthesis of H2O2 with GDEs in electrolyte solutions in a separate reactor as an alternative for on-site H2O2 production in water treatment. Results show that many reactor configurations and operational parameters (e.g., electrode distance, current densities, electrolytes, and GDE backpressure) intertwine to have complex influences on the overall performance of H2O2 production in terms of H2O2 production rates and current efficiencies, GDE stability, operating cost, and GDE capital cost. Under optimized conditions determined in this study (4 mm electrode distance, 150–200 mA/cm2 current densities, 1 M Na2SO4, and 30 kPa GDE backpressure), ∼29,000–34,000 mg/L of H2O2 could be produced with production rates of 57.3–68.3 mg/h/cm2 and apparent current efficiencies of 55%–61% during H2O2 electrosynthesis with a divided cell, and the GDEs maintained stable H2O2 production over ∼350–1000 h before water penetrated the GDEs due to the electrocapillary effect. The operating cost, including the electricity, electrolytes, water, and oxygen consumed in the process, was ∼1.32–1.48 $/kgH2O2, and the capital cost was ∼0.30–0.46 $/kgH2O2. The results of this study suggest that it is technoeconomically feasible to scale up H2O2 electrosynthesis with GDEs in electrolytes to produce H2O2 on site in some water treatment applications, e.g., micropollutant removal in drinking water treatment by H2O2-based AOPs. Additional studies are needed to further extend the GDE lifetime by improving GDE fabrications and operations to prevent water penetration during H2O2 electrosynthesis.

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Section: Stability and Capital Cost Of Gdementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Technoeconomic Assessment of Electrochemical Hydrogen Peroxide Production with Gas Diffusion Electrodes under Scenarios Relevant to Practical Water Treatment

Zhao,

Xia,

et al. 2023

ACS EST Eng.

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“…These reactions fundamentally occurred due to the formation of hydroxyl radicals produced by H 2 O 2 [16,17] . Understandably, the massive need for H 2 O 2 on the market will increase by approximately 5.7 % between 2020 and 2026 [18] …”

Section: Introductionmentioning

confidence: 99%

“…[16,17] Understandably, the massive need for H 2 O 2 on the market will increase by approximately 5.7 % between 2020 and 2026. [18] In 1818, a French chemist, Louis Jacques Thenard, first demonstrated a reaction that could evolve a low concentration of H 2 O 2 by using barium peroxide and nitric acid. [20] Throughout history, the method for synthesizing H 2 O 2 was gradually developed and came up with the anthraquinone oxidation (AO) process in 1939, as demonstrated in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Graphitic Carbon Nitride Based Materials Towards Photoproduction of H₂O₂

et al. 2023

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Hydrogen peroxide (H 2 O 2 ) can be considered as one of the world's indispensable chemicals. However, the synthetic process can prompt several severe environmental and human health issues. However, solar H 2 O 2 production may provide opportunities to mitigate such issues. Graphitic carbon nitride (g-C 3 N 4 ) has emerged as one promising material for photocatalytic applications due to its unique properties. Although tremendous efforts in engineering g-C 3 N 4 have been proposed to improve catalytic results, the materials obtained still have some issues.Additionally, the mechanisms behind the production of H 2 O 2 by using such materials are not yet fully understood. Herein, we conducted a literature survey reviewing the production of H 2 O 2 using g-C 3 N 4 -based materials. The essential aspects of and current challenges in photocatalytic H 2 O 2 generation are discussed, which may provide insight for researchers to overcome barriers and develop sustainable methods for H 2 O 2 production.

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Understanding Advanced Transition Metal‐Based Two Electron Oxygen Reduction Electrocatalysts from the Perspective of Phase Engineering

Yang,

An,

Kang

et al. 2024

Advanced Materials

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Non‐noble transition metal (TM)‐based compounds have recently become a focal point of extensive research interest as electrocatalysts for the two electron oxygen reduction (2e− ORR) process. To efficiently drive this reaction, these TM‐based electrocatalysts must bear unique physiochemical properties, which are strongly dependent on their phase structures. Consequently, adopting engineering strategies toward the phase structure has emerged as a cutting‐edge scientific pursuit, crucial for achieving high activity, selectivity, and stability in the electrocatalytic process. This comprehensive review addresses the intricate field of phase engineering applied to non‐noble TM‐based compounds for 2e− ORR. First, the connotation of phase engineering and fundamental concepts related to oxygen reduction kinetics and thermodynamics are succinctly elucidated. Subsequently, the focus shifts to a detailed discussion of various phase engineering approaches, including elemental doping, defect creation, heterostructure construction, coordination tuning, crystalline design, and polymorphic transformation to boost or revive the 2e− ORR performance (selectivity, activity, and stability) of TM‐based catalysts, accompanied by an insightful exploration of the phase‐performance correlation. Finally, the review proposes fresh perspectives on the current challenges and opportunities in this burgeoning field, together with several critical research directions for the future development of non‐noble TM‐based electrocatalysts.This article is protected by copyright. All rights reserved

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Recent advances in H2O2 electrosynthesis based on the application of gas diffusion electrodes: Challenges and opportunities

Cited by 18 publications

References 67 publications

Technoeconomic Assessment of Electrochemical Hydrogen Peroxide Production with Gas Diffusion Electrodes under Scenarios Relevant to Practical Water Treatment

Technoeconomic Assessment of Electrochemical Hydrogen Peroxide Production with Gas Diffusion Electrodes under Scenarios Relevant to Practical Water Treatment

Graphitic Carbon Nitride Based Materials Towards Photoproduction of H₂O₂

Understanding Advanced Transition Metal‐Based Two Electron Oxygen Reduction Electrocatalysts from the Perspective of Phase Engineering

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Recent advances in H2O2 electrosynthesis based on the application of gas diffusion electrodes: Challenges and opportunities

Cited by 18 publications

References 67 publications

Technoeconomic Assessment of Electrochemical Hydrogen Peroxide Production with Gas Diffusion Electrodes under Scenarios Relevant to Practical Water Treatment

Technoeconomic Assessment of Electrochemical Hydrogen Peroxide Production with Gas Diffusion Electrodes under Scenarios Relevant to Practical Water Treatment

Graphitic Carbon Nitride Based Materials Towards Photoproduction of H2O2

Understanding Advanced Transition Metal‐Based Two Electron Oxygen Reduction Electrocatalysts from the Perspective of Phase Engineering

Contact Info

Product

Resources

About

Graphitic Carbon Nitride Based Materials Towards Photoproduction of H₂O₂