TY - JOUR

T1 - Elucidating the Reaction Pathway of Glucose Electrooxidation to Its Valuable Products

T2 - The Influence of Mass Transport and Electrode Potential on the Product Distribution

AU - Schlegel, Nicolas

AU - Bagger, Alexander

AU - Rossmeisl, Jan

AU - Arenz, Matthias

N1 - Funding Information: We acknowledge support from the Swiss National Science Foundation (SNSF) project No. 200021_184742 and the Danish National Research Foundation Center for High Entropy Alloy Catalysis (DNRF 149). A.B. acknowledges support from the Carlsberg Foundation (CF21-0144). Publisher Copyright: © 2023 American Chemical Society.

PY - 2023

Y1 - 2023

N2 - Converting glucose electrochemically to its valuable derivatives, gluconic and glucaric acids, is a promising process for the utilization of renewable carbon sources. Understanding the reaction pathway to form glucaric acid from glucose is key to performing the process efficiently. In this study, we investigate the influence of mass transport as well as electrode potential on the product distribution in glucose, gluconic acid, and glucuronic acid oxidation on a gold disk in an RDE setup. We find glucose and glucuronic acid to be easily oxidized, while the oxidation of gluconic acid is kinetically limited. Combining DFT calculations and the experimental results, we show that on gold, the oxidation of aldehyde groups proceeds readily, while the oxidation of hydroxyl groups is challenging and occurs indiscriminately on C atoms in glucose and its derivatives. Additionally, the DFT calculations present a reaction pathway that can explain the absence of glucuronic acid in the conducted experiments.

AB - Converting glucose electrochemically to its valuable derivatives, gluconic and glucaric acids, is a promising process for the utilization of renewable carbon sources. Understanding the reaction pathway to form glucaric acid from glucose is key to performing the process efficiently. In this study, we investigate the influence of mass transport as well as electrode potential on the product distribution in glucose, gluconic acid, and glucuronic acid oxidation on a gold disk in an RDE setup. We find glucose and glucuronic acid to be easily oxidized, while the oxidation of gluconic acid is kinetically limited. Combining DFT calculations and the experimental results, we show that on gold, the oxidation of aldehyde groups proceeds readily, while the oxidation of hydroxyl groups is challenging and occurs indiscriminately on C atoms in glucose and its derivatives. Additionally, the DFT calculations present a reaction pathway that can explain the absence of glucuronic acid in the conducted experiments.

U2 - 10.1021/acs.jpcc.3c03055

DO - 10.1021/acs.jpcc.3c03055

M3 - Journal article

AN - SCOPUS:85172933955

VL - 127

SP - 18609

EP - 18618

JO - The Journal of Physical Chemistry Part C

JF - The Journal of Physical Chemistry Part C

SN - 1932-7447

IS - 37

ER -