High-performance gas-diffusion electrodes for H2O2 electrosynthesis

Cordeiro, Paulo Jorge Marques; Martins, Alysson Stefan; Pereira, George Bueno Santana; Rocha, Fábio R.P.; Rodrigo, Manuel A.; Lanza, Marcos Roberto de Vasconcelos

doi:10.1016/j.electacta.2022.141067

Cited by 12 publications

(1 citation statement)

References 34 publications

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“…For the synthesis of H 2 O 2 , the high-energy-demanding anthraquinone process is currently by far the most established process . Due to its high energy demand, the less energy-demanding electrochemical synthesis of H 2 O 2 via the two-electron oxygen reduction reaction (2e – ORR) from oxygen (eq ) using gas diffusion electrodes (GDEs) represents an emerging field of research. − normalO 2 + 2 normalH + + 2 normale − → normalH 2 normalO 2 …”

Section: Introductionmentioning

confidence: 99%

General Route to Indirect and On-Demand Electrosynthesis of (Various) Peroxy Acids via In Situ Generated Hydrogen Peroxide on a Gas Diffusion Electrode

Schneider,

Stöckl

2024

ACS Sustainable Chem. Eng.

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Most established synthesis routes in the chemical industry are based on high-energy-demanding processes and rely on the consumption of fossil fuels. Organic peracids, which can be used as ecofriendly and highly effective disinfectants, are typically synthesized by the reaction of a carboxylic acid and hydrogen peroxide (H2O2), which can be electrochemically synthesized with renewable electricity. In particular, the use of gas diffusion electrodes can open a new field for indirect and on-demand electrochemical peracid production. In this paper, the implementation of an electrochemical in-cell synthesis of various peracids building up on the improved synthesis of performic acid (PFA) is described. H2O2 was obtained at high current densities of 100 mA cm–2 and directly reacted with the formate catholyte solution. The reaction was improved using a buffered system and 1 wt % H3PO4 ending up with 1.47 mol L–1 H2O2 and 0.24 mol L–1 PFA and current efficiencies of 37.5% and 6.1% after 24 h of electrosynthesis, respectively. Finally, the reaction conditions were successfully transferred, demonstrating the first comprehensive approach to the indirect electrosynthesis of various carboxylic peracids and introducing a general electrochemical in-cell synthesis route.

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Section: Introductionmentioning

confidence: 99%

General Route to Indirect and On-Demand Electrosynthesis of (Various) Peroxy Acids via In Situ Generated Hydrogen Peroxide on a Gas Diffusion Electrode

Schneider,

Stöckl

2024

ACS Sustainable Chem. Eng.

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Singlet oxygen generation for selective oxidation of emerging pollutants in a flow-by electrochemical system based on natural air diffusion cathode

Xie

Yao

2022

Environ Sci Pollut Res

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The decay of free radicals involved in side reactions is one of the challenges faced by electrochemical degradation of organic pollutants. To this end, a non-radical oxidation process was constructed by a natural air diffusion cathode (ADC) and a RuO 2 -Ti anode for cathodic hydrogen peroxide activation by anodic chlorine evolution. The ADC fabricated by the carbon black of BP2000 produced a stable concentration of hydrogen peroxide of 339.94 mg/L (current e ciency of 73.4%) without aeration, which was superior to the cathode made by the carbon black of XC72. The ow-by electrochemical system consisted of an ADC and a RuO 2 -Ti anode showed high selectivity to aniline compared to benzoate.Quenching experiments revealed the main active intermediate responsible for the pollutant degradation was singlet oxygen ( 1 O 2 ), which was also identi ed by the electron spin resonance (ESR) analysis. Finally, the steady-stable content of 1 O 2 was quantitatively determined to be 6.25×10 − 11 M by the method of furfuryl alcohol (FFA) probe. Our ndings provide a fast, low energy consumption and well controlled electrochemical oxidation method for selective degradation of organic pollutants.

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Improvement of H2O2 electrogeneration using a Vulcan XC72 carbon-based electrocatalyst modified with Ce-doped Nb2O5

Trench,

Paulo C. Moura,

Antonin

et al. 2024

Advanced Powder Technology

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High-performance gas-diffusion electrodes for H2O2 electrosynthesis

Cited by 12 publications

References 34 publications

General Route to Indirect and On-Demand Electrosynthesis of (Various) Peroxy Acids via In Situ Generated Hydrogen Peroxide on a Gas Diffusion Electrode

General Route to Indirect and On-Demand Electrosynthesis of (Various) Peroxy Acids via In Situ Generated Hydrogen Peroxide on a Gas Diffusion Electrode

Singlet oxygen generation for selective oxidation of emerging pollutants in a flow-by electrochemical system based on natural air diffusion cathode

Improvement of H2O2 electrogeneration using a Vulcan XC72 carbon-based electrocatalyst modified with Ce-doped Nb2O5

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