Catalysis of oxygen reduction reaction for H2O2 electrogeneration: The impact of different conductive carbon matrices and their physicochemical properties

Cordeiro-Junior, Paulo Jorge Marques; Kronka, Matheus S.; Goulart, Lorena Athie; Verissimo, Nathália Carolina; Mascaro, Lúcia H.; Santos, Mauro C.; Bertazzoli, Rodnei; Lanza, Marcos Roberto de Vasconcelos

doi:10.1016/j.jcat.2020.09.020

Cited by 34 publications

(13 citation statements)

References 43 publications

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“…Hydrogen peroxide (H 2 O 2 ) is a highly efficient, eco-friendly chemical oxidant, which has a wide range of applications in different sectors . H 2 O 2 has a high reduction potential ( E 0 = 1.77 vs standard hydrogen electrode, SHE) and produces nontoxic water when applied; as a result, this oxidant is widely applied in several industrial processes, including the synthesis of chemical products, paper bleaching, and wastewater treatment. − As part of the efforts to combat the SARS-CoV-2 virus, H 2 O 2 was widely employed as a reagent in the formulation of decontamination and disinfection products and for the cleaning of contaminated respiratory masks for reutilization due to its antimicrobial properties …”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Electrochemical Production of Hydrogen Peroxide Using the GDE Technology

Cordeiro-Junior

Lobato

Lanza

et al. 2022

Ind. Eng. Chem. Res.

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This work examines the role of oxygen supply in the improvement of the hydrogen peroxide (H2O2) electrochemical production efficiency and the generation of high H2O2 concentrations in electrochemical processes operated in a discontinuous mode. To conduct this study, a highly efficient Printex L6 carbon-based gas diffusion electrode (GDE) as a cathode was employed for the electrogeneration of H2O2 in a flow-by reactor and evaluated the effects of lowering the operation temperature (to increase solubility) and increasing the air supply in the system on H2O2 electrogeneration. The results obtained in this study show that unlike what is expected in flow-through reactors, the efficiency in the H2O2 production is not affected by the solubility of oxygen when GDE is employed in the electrochemical process (using the flow-by reactor); i.e., the efficiency of H2O2 production is not significantly dependent on O2 solubility, temperature, and pressure. The application of the proposed PL6C-based GDE led to the generation of accumulated H2O2 of over 3 g L–1 at a high current density. It should be noted, however, that the application of the electrocatalyst at lower current densities resulted in higher energy efficiency in terms of H2O2 production. Precisely, a specific production of H2O2 as high as 131 g kWh–1 was obtained at 25 mA cm–2; the energy efficiency (in terms of H2O2 production) values obtained in this study based on the application of the proposed GDE in a flow-by reactor at low current densities were found to be within the range of values recorded for H2O2 production techniques that employ flow-through reactors.

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Section: Introductionmentioning

confidence: 99%

Highly Efficient Electrochemical Production of Hydrogen Peroxide Using the GDE Technology

Cordeiro-Junior

Lobato

Lanza

et al. 2022

Ind. Eng. Chem. Res.

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“…N represents the collection efficiency of RRDE, which was determined as 0.37. ECSAs (cm 2 ECSA cm −2 GEO ) were calculated according to Equation ( 5) [39].…”

Section: Electrochemical Evaluation Of Catalystmentioning

confidence: 99%

2D Zinc-Based Metal–Organic Complexes Derived N-Doped Porous Carbon Nanosheets as Durable Air Cathode for Rechargeable Zn–Air Batteries

et al. 2022

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The defect and N-doping engineering are critical to developing the highly efficient metal-free electrocatalysts for oxygen reduction reaction (ORR), mainly because they can efficiently regulate the geometric/electronic structures and sur-/interface properties of the carbon matrix. Herein, we provide a facile and scalable strategy for the large-scale synthesis of N-doped porous carbon nanosheets (NPCNs) with hierarchical pore structure, only involving solvothermal and pyrolysis processes. Additionally, the turnover frequency of ORR (TOFORR) was calculated by taking into account the electron-transfer number (n). Benefiting from the trimodal pore structures, high specific surface area, a higher pore volume, high-ratio mesopores, massive vacancies/long-range structural defects, and high-content pyridinic-N (~2.1%), the NPCNs-1000 shows an excellent ORR activity (1600 rpm, js = ~5.99 mA cm−2), a selectivity to four-electron ORR (~100%) and a superior stability in both the three-electrode tests (CP test for 7500 s at 0.8 V, Δjs = ~0.58 mA cm−2) and Zn–Air battery (a negligible loss of 0.08 V within 265 h). Besides, the experimental results indicate that the enhancement of ORR activity mainly originates from the defects and pyridinic-N. More significantly, this work is expected to realize green and efficient energy storage and conversion along with the carbon peaking and carbon neutrality goals.

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“…The leakage of the Co-Porphyrin catalyst from the Printex L6 carbon matrix was evaluated by cyclic voltammetry technique (CV) [24,26] employing a rotating ring-disc electrode (RRDE-Pine Instrument -AFE7R9GCPT) as working electrode, Pt-counter electrode and Ag/AgCl (KCl 3 mol L -1 ). A dispersion containing 2.5 mg of the material in 1 ml of dimethylformamide was prepared; and 25 µL of this solution was dropped onto the electrode disc.…”

Section: Leakage Of Co Ions From Gdemmentioning

confidence: 99%

“…GDEs are composed of an amorphous carbon black matrix and an agglomerating agent known as polytetrafluorethylene (PTFE); these materials form a multichannel structure which allows the flow of oxygen and partial penetration of solution in the device. Previous studies reported in the literature have shown that Printex L6 carbon is one of the best cathodic materials for the electrogeneration of H2O2 in ORR via 2 e - [23,24]. However, the application of this cathodic material (Printex L6 carbon) in ORR leads to high energy consumptionthus, energy consumption is one of the limiting factors of the reaction.…”

Section: Introductionmentioning

confidence: 99%

Bisphenol-S removal via photoelectro-fenton/H2O2 process using Co-porphyrin/Printex L6 gas diffusion electrode

Cordeiro-Junior

Martins

Pereira

et al. 2022

Separation and Purification Technology

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Catalysis of oxygen reduction reaction for H2O2 electrogeneration: The impact of different conductive carbon matrices and their physicochemical properties

Cited by 34 publications

References 43 publications

Highly Efficient Electrochemical Production of Hydrogen Peroxide Using the GDE Technology

Highly Efficient Electrochemical Production of Hydrogen Peroxide Using the GDE Technology

2D Zinc-Based Metal–Organic Complexes Derived N-Doped Porous Carbon Nanosheets as Durable Air Cathode for Rechargeable Zn–Air Batteries

Bisphenol-S removal via photoelectro-fenton/H2O2 process using Co-porphyrin/Printex L6 gas diffusion electrode

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