Practical-scale on-site production of hydrogen peroxide (H2O2) via two-electron (2e(-)) oxygen reduction reaction (ORR) relies on efficient, robust, and selective electrocatalysts. Among them, carbon-based materials are cheap, abundant, durable, and their surface properties can be tuned to favor the 2e(-) ORR pathways, resulting in higher efficiency and facilitating possible scale-up towards commercially appealing levels. Here, we demonstrate that the selective installment of carboxyl groups on the surface of N-doped graphene yielding a material named graphene acid (N-GA) promotes the catalytic 2e(-) ORR, achieving a H2O2 faradaic efficiency (FE) as high as 70 % in acidic media (pH=0.96) and a H2O2 productivity in long term bulk electrolysis that could reach 107.8 mmol g(catalyst)(-1) h(-1) under optimized conditions. Extended XPS analysis and density functional theory (DFT) calculations revealed that surface carboxylic acid functional groups play a significant role in achieving the high activity of N-GA for 2e(-) ORR.

Enhanced On-Site Hydrogen Peroxide Electrosynthesis by a Selectively Carboxylated N-Doped Graphene Catalyst

Michele Melchionna;Paolo Fornasiero
;
2021

Abstract

Practical-scale on-site production of hydrogen peroxide (H2O2) via two-electron (2e(-)) oxygen reduction reaction (ORR) relies on efficient, robust, and selective electrocatalysts. Among them, carbon-based materials are cheap, abundant, durable, and their surface properties can be tuned to favor the 2e(-) ORR pathways, resulting in higher efficiency and facilitating possible scale-up towards commercially appealing levels. Here, we demonstrate that the selective installment of carboxyl groups on the surface of N-doped graphene yielding a material named graphene acid (N-GA) promotes the catalytic 2e(-) ORR, achieving a H2O2 faradaic efficiency (FE) as high as 70 % in acidic media (pH=0.96) and a H2O2 productivity in long term bulk electrolysis that could reach 107.8 mmol g(catalyst)(-1) h(-1) under optimized conditions. Extended XPS analysis and density functional theory (DFT) calculations revealed that surface carboxylic acid functional groups play a significant role in achieving the high activity of N-GA for 2e(-) ORR.
4-ago-2021
Pubblicato
https://chemistry-europe.onlinelibrary.wiley.com/doi/epdf/10.1002/cctc.202100805
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11368/3028718
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