Electrochemical valorization of HMF using Ni/Graphite electrodes

# Dataset of "Electrochemical valorization of HMF using Ni/Graphite electrodes"

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## GENERAL INFORMATION----------------------

1. Dataset title: "Electrochemical valorization of HMF using Ni/Graphite electrodes"

2. Authorship:      Name: David Carvajal    Institution: Institute of Advanced Materials (INAM), Universitat Jaume I, 12006 Castelló, Spain    ORCID: 0000-0003-3723-0371

    Name: Ramón Arcas    Institution: Institute of Advanced Materials (INAM), Universitat Jaume I, 12006 Castelló, Spain    ORCID: 0000-0001-5813-2768

    Name: Laxman Gouda    Institution: Institute of Advanced Materials (INAM), Universitat Jaume I, 12006 Castelló, Spain    ORCID: 0000-0001-9022-0151        Name: Francisco Fabregat-Santiago    Institution: Institute of Advanced Materials (INAM), Universitat Jaume I, 12006 Castelló, Spain    ORCID: 0000-0002-7503-1245

    Name: Elena Mas-Marzá    Institution: Institute of Advanced Materials (INAM), Universitat Jaume I, 12006 Castelló, Spain    Email:      ORCID: 0000-0002-2308-0635

## FILE DESCRIPTION--------------### Figure 2- Fig2a.txt : Cyclic voltammetries for the oxidation of HMF (0–50 mM), using Ni/PGR as working electrode, Pt as counter electrode and Ag/AgCl as reference (RHE potential scale), in 1 M LiOH as electrolyte at 5 mV/s scan.- Fig2b.txt : Cyclic voltammetries for the oxidation of HMF (0–50 mM), using Ni/PGR as working electrode, Pt as counter electrode and Ag/AgCl as reference (RHE potential scale), in 0.5 M LiOH/0.5 M LiCl as electrolyte at 5 mV/s scan.- Fig2c.txt : Cyclic voltammetries for the oxidation of HMF (0–50 mM), using Ni/PGR as working electrode, Pt as counter electrode and Ag/AgCl as reference (RHE potential scale), in 0.25 M LiOH/0.75 M LiCl as electrolyte at 5 mV/s scan.

### Figure 3- Fig3a.txt : HMF and FDCA concentration vs time, for 10 mM of initial concentration of HMF, using Ni/PGR as working electrodes at 1.5 V vs RHE, in 1 M LiOH.- Fig3b.txt : HMF and FDCA concentration vs time, for 10 mM of initial concentration of HMF, using Ni/PGR as working electrodes at 1.5 V vs RHE, in 0.5 M LiOH/0.5 M LiCl.- Fig3c.txt : HMF and FDCA concentration vs time, for 10 mM of initial concentration of HMF, using Ni/PGR as working electrodes at 1.5 V vs RHE, in 0.25 M LiOH/0.75 M LiCl.- Fig3d.txt : Evolution of the FE for the formation of FDCA vs time.

### Figure 4- Fig4a.txt : Cyclic voltammetries using 5 Ni/PGR as working electrode, Pt as counter electrode and Ag/AgCl as reference (RHE potential scale), in 0.5 M LiOH/0.5 M LiCl, at 5 mV/s scan rate with 10 mM of HMF.- Fig4b.txt : HMF and FDCA concentration and % FE results for chronoamperometry of 10 mM initial concentration of HMF with5 Ni/PGR as working electrode with 0.5 M LiOH/0.5 M LiCl.

### Figure 5- Fig5.txt : J-V curves after series resistance correction, taken during IS measurements using Ni/PGR as working electrode, Pt as counter electrode and Ag/AgCl as reference (RHE potential scale), in aqueous electrolytes containing 1 M LiOH and 0.5MLiOH/0.5 M LiCl with 0 mM and 40 mM HMF.

### Figure S1-FigS1.txt : Cyclic voltammetries for Ni electrodeposition over PGR, using as working PGR electrode, Pt as a counter electrode, and Ag/AgCl as a reference, in a 20mM NiCl2 and 100mM Na2SO4 at 50 mV/s scan rate.

### Figure S5-FigS5a.txt : Calibration curves were obtained from the area of the HPLC peaks of HMF (285 nm).-FigS5b.txt : Calibration curves were obtained from the area of the HPLC peaks of FDCA (250 mm).

### Figure S6-FigS6.txt : HPLC chromatograms at different reaction times for 10mM HMF oxidation experiment with Ni/PGR electrode at 250 nm and 285 nm using 0.5M/0.5M LiOH/LiCl. Time elution 3.5 min for HMF, 4.6 min for FDCA.

### Figure S7-FigS7.txt : HPLC chromatograms at different reaction times for the oxidation of 10mM of HMF with Ni/PGR electrode at 250 nm show the signal for the intermediary species HMFCA (4.0 min) and FFCA (3.8 min) using 0.5M/0.5M LiOH/LiCl. Both species were obtained in very low concentrations (µM).

### Figure S9-FigS9.txt : Kinetic of formate formation in 1M LiOH and 0.5M LiOH/0.5M LiCl solutions.

### Figure S10-FigS10.txt : Stability of the Ni/PGR electrode during seven cycles of oxidation of 10mM of HMF.

### Figure S11-FigS11.txt : Integration of CV to estimate active Ni on the surface of the Ni/PGR electrode, moles of Ni = 1.70±0.03)·10-6.