Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
Publication date: 11th July 2022
Electrocatalytic hydrogenation of 5-hydroxymethylfurfural (HMF) to 2,5-bis(hydroxymethyl)-furan (BHMF) opens an alternative route to conventional heterogeneous catalysis with H2 at high temperature and pressure. This study synthesizes porous dendritic Bi, Sn, and BiSn electrodes using an in-situ generated hydrogen bubble template to evaluate their electro-catalytic activity toward HMF conversion to BHMF. DFT computations on adsorption energy (Eads) and elementary hydrogenation reaction steps of HMF predict the superiority of Bi to Sn, as well as the intermediate behavior of BiSn between Bi and Sn. The pH affects the competing process of hydrogen evolution reaction (HER) and the distribution of the products derived from HMF reduction. The dendritic BiSn catalyst generates a current density of -145.7 mA cm-2 at Faradaic efficiency (FE) of ~100% for BHMF production at pH ~7 (corresponding to the BHMF production rate of ~2.7 mmol h-1 cm-2) in prolonged electrolysis. The BiSn cathode is further demonstrated to drive HMF hydrogenation at FE of ~100% when coupled to NiOOH anode for HMF oxidation to 2,5-furandicarboxylic acid at FE of ~95%. Considering the material cost (<5% of Ag price) and quick synthesis (<40 s), dendric BiSn can be considered as a potential candidate for HMF hydrogenation.
This study was supported by the National Research Foundation of Korea (2018R1A6A1A03024962).
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