Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
Energy generation devices have been grown tremendously from fast few decades, but the system is still limited with energy storage devices. Storing energy in the batteries is not the permanent solution, nevertheless energy can’t be store longer period. Only way to store energy for longer period is storing energy in chemical bonds, such as fuels, gas or chemicals. Therefore, concept of electrochemical energy storage device has been rising recently, especially electrochemical organic synthesis, has made a footprint for the green synthesis of value-added chemicals. Impotently these electrochemical processes can be renewable. Considering, carbon neutral industry promise – biomass has great potential for providing many flatform chemicals. The one of the elements of biomass, 5-hydroxymethylfurfural (HMF) and its oxidized form 2,5-furandicarboxylic acid (FDCA) is a monomer of biobased polymer and its properties are superior than the PET. We have investigated efficient electrochemical conversion of HMF to FDCA using abundant nickel as a catalyst. We investigated the key factors for tuning the chemical selectivity for HMF oxidation over the competing oxygen evolution reaction (OER) at the catalyst surface. We show that the selectivity for HMF oxidation is enhanced by removing trace impurities of iron species as well as adjusting the composition of the alkali hydroxide electrolyte solution. LiOH electrolyte without iron impurities is more favorable for HMF oxidation and whereas CsOH with iron species present is more active for OER and unfavorable for HMF oxidation. Under optimized condition we have achieved 98% faradaic efficiency for the production of FDCA from HMF, with iron free 1M LiOH electrolyte (pH 14). This simple approach can be used as model system for other electrochemical organic synthesis, where OER is competing process.
The University of Zurich and the University Research Priority Program (URPP) LightChEC are gratefully acknowledged for funding. UZH-Center for Microscopy and Image Analysis and Jonas Zurflüh for HPLC analysis are acknowledged for the service. The Institute of Advanced Materials from Universitat Jaume I acknowledges Generalitat Valencia under project- GRISOLIAP/2018/A/070 and Ministerio de Economía y Competitividad (MINECO) under project ENE2017-85087-C3-1-R for financial support.
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