N-Doped porous carbons obtained from chitosan and spent coffee as electrocatalysts with tuneable oxygen reduction reaction selectivity for H<sub>2</sub>O<sub>2</sub>generation

Wittmar, Alexandra S. M.; Vigneswaran, Thaarmikaa; Ranković, Nikola; Hagemann, Ulrich; Hartmann, Nils; Martínez-Hincapié, Ricardo; Čolić, Viktor; Ulbricht, Mathias

doi:10.1039/d3ra02587j

RSC Adv.

2023

DOI: 10.1039/d3ra02587j

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N-Doped porous carbons obtained from chitosan and spent coffee as electrocatalysts with tuneable oxygen reduction reaction selectivity for H₂O₂generation

Alexandra S. M. Wittmar,

Thaarmikaa Vigneswaran,

Nikola Ranković

et al.

Abstract: Nitrogen-doped porous carbons prepared by the pyrolysis of coffee and chitosan have shown potential for electrochemical applications like H2O2 selective generation.

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Electrochemical Insights into Hydrogen Peroxide Generation on Carbon Electrodes: Influence of Defects, Oxygen Functional Groups, and Alkali Metals in the Electrolyte

Olean-Oliveira,

Hasnain,

Martínez-Hincapié

et al. 2024

ACS Catal.

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Hydrogen peroxide (H 2 O 2 ) is an environmentally friendly oxidant, with production reaching 5.7 million tons by 2028 and a market size of USD 4.04 billion by 2029. Understanding the mechanism of oxygen reduction to H 2 O 2 and the structure−activity relations on carbon materials is, therefore, of high significance for the more environmentally friendly synthesis of this important chemical. We have used oriented pyrolytic graphite (PG-edge and PG-basal) and glassy carbon (GC) as model electrodes to investigate the influence of carbon defects, oxygen-containing functional groups, and the presence of alkali metals on the activity and selectivity toward H 2 O 2 production under acidic conditions. Electrochemical measurements, such as rotating ring disk electrode and electrochemical impedance spectroscopy, as well as in situ Raman spectroelectrochemistry indicated that PG-basal and GC electrodes preferentially form H 2 O 2 as the product through the twoelectron pathway via inner and outer sphere mechanisms, respectively. The mechanism is significantly affected by the potential of maximal entropy, which determines the position of species in the solution within the inner or outer Helmholtz plane. The influence of alkali cations (Li + , Na + , K + , and Cs + ) on the oxygen reduction reaction of these model carbon electrodes was investigated. Large cations, e.g., K + and Cs + , showed influence on the reaction intermediates and thus on the electrodes' selectivity. The present study provides important insights and contributions to the fundamental aspects of hydrogen peroxide production in acidic conditions and further advancements in the development of metal-free carbon-based catalysts.

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Electrochemical Insights into Hydrogen Peroxide Generation on Carbon Electrodes: Influence of Defects, Oxygen Functional Groups, and Alkali Metals in the Electrolyte

Olean-Oliveira,

Hasnain,

Martínez-Hincapié

et al. 2024

ACS Catal.

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show abstract

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N-Doped porous carbons obtained from chitosan and spent coffee as electrocatalysts with tuneable oxygen reduction reaction selectivity for H₂O₂generation

Abstract: Nitrogen-doped porous carbons prepared by the pyrolysis of coffee and chitosan have shown potential for electrochemical applications like H2O2 selective generation.

Cited by 1 publication

References 83 publications

Electrochemical Insights into Hydrogen Peroxide Generation on Carbon Electrodes: Influence of Defects, Oxygen Functional Groups, and Alkali Metals in the Electrolyte

Electrochemical Insights into Hydrogen Peroxide Generation on Carbon Electrodes: Influence of Defects, Oxygen Functional Groups, and Alkali Metals in the Electrolyte

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N-Doped porous carbons obtained from chitosan and spent coffee as electrocatalysts with tuneable oxygen reduction reaction selectivity for H2O2generation

Abstract: Nitrogen-doped porous carbons prepared by the pyrolysis of coffee and chitosan have shown potential for electrochemical applications like H2O2 selective generation.

Cited by 1 publication

References 83 publications

Electrochemical Insights into Hydrogen Peroxide Generation on Carbon Electrodes: Influence of Defects, Oxygen Functional Groups, and Alkali Metals in the Electrolyte

Electrochemical Insights into Hydrogen Peroxide Generation on Carbon Electrodes: Influence of Defects, Oxygen Functional Groups, and Alkali Metals in the Electrolyte

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N-Doped porous carbons obtained from chitosan and spent coffee as electrocatalysts with tuneable oxygen reduction reaction selectivity for H₂O₂generation