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Insights into the Electrochemical Reduction of 5‐Hydroxymethylfurfural at High Current Densities
Author(s) -
Luna Giancosimo Sanghez,
Sacco Adriano,
Hernandez Simelys,
Ospitali Francesca,
Albonetti Stefania,
Fornasari Giuseppe,
Benito Patricia
Publication year - 2022
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202102504
Subject(s) - tafel equation , electrocatalyst , electrochemistry , chemistry , selectivity , dielectric spectroscopy , exchange current density , current density , electrolyte , electrode , charge transfer coefficient , inorganic chemistry , analytical chemistry (journal) , catalysis , cyclic voltammetry , organic chemistry , physics , quantum mechanics
The electrocatalytic reduction of 5‐hydroxymethylfurfural (HMF) is highly selective to 2,5‐bishydroxymethylfuran (BHMF) at pH=9.2, diluted HMF solutions, and low current densities. In this work, the electrochemical reduction of 0.05 m HMF solutions was investigated in the 5–50 mA cm −2 current density range over an AgCu foam electrocatalyst. The selectivity towards the formation of BHMF or the dimerization depended on the current density, likely due to differences in the electrode potential, and on the reaction time. Operating at current densities of 40–50 mA cm −2 allowed to find a trade‐off between HMF and H 2 O activation, achieving 85 % BHMF selectivity and fostering the productivity (0.567 mmol cm −2 h −1 ), though co‐producing H 2 . The electrochemical characterization by Tafel slopes and electrochemical impedance spectroscopy indicated that the HMF reduction was kinetically favored in comparison to the hydrogen evolution reaction and that the process was limited by charge transfer.