Affiliation:
1. Nanosystems Engineering Research Center for Nanotechnology‐Enabled Water Treatment School of Sustainable Engineering and the Built Environment Arizona State University Tempe AZ 85287‐3005 USA
2. São Carlos Institute of Chemistry University of São Paulo Avenida Trabalhador São Carlense 400 São Carlos São Paulo 13566‐590 Brazil
3. Department of Civil and Environmental Engineering University of Maine Orono ME 04469 USA
Abstract
AbstractThe electrogeneration of hydrogen peroxide (H2O2) via the oxygen reduction reaction is a crucial process for advanced water treatment technologies. While significant effort is being devoted to developing highly reactive materials, gas provision systems used in these processes are receiving less attention. Here, using oxygen nanobubbles to improve the gas efficiency of the electrogeneration of H2O2 is proposed. Aeration with nanobubbles is compared to aeration with macrobubbles under an identical experimental set‐up, with nanobubbles showing a much higher gas–liquid volumetric mass transfer coefficient (KLa) of 2.6 × 10−2 min−1 compared to 2.7 × 10−4 min−1 for macrobubbles. Consequently, nanobubbles exhibit a much higher gas efficiency using 60% of O2 delivered to the system compared to 0.19% for macrobubbles. Further, it is observed that the electrogeneration of H2O2 using carbon felt electrodes is enhanced using nanobubbles. Under the same dissolved oxygen levels, nanobubbles boost the reaction yield to 84%, while macrobubbles yield only 53.8%. To the authors’ knowledge, this is the first study to investigate the use of nanobubbles in electrochemical reactions and demonstrate their ability to enhance gas efficiency and electrocatalytic response. These findings have important implications for developing more efficient chemical and electrochemical processes operating under gas‐starving systems.
Funder
National Aeronautics and Space Administration
Fundação de Amparo à Pesquisa do Estado de São Paulo
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
2 articles.
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