Data for Figures:Towards Sustainable Hydrogen Production via Electrochemical Valorization of Real Wine-Industry Biomass-Waste on Metal-Free Carbon Anodes

This record contains the underlying raw data for the figures presented in the publication: "Towards Sustainable Hydrogen Production via Electrochemical Valorization of Real Wine-Industry Biomass-Waste on Metal-Free Carbon Anodes". The study was conducted as part of the ELOBIO project (Grant No. 101070856) and investigates the electrochemical valorization of real wine-industry biomass waste using a metal-free Vulcan XC-72R anode, coupled with cathodic hydrogen evolution at low cell potentials. The research highlights the potential of low-cost carbon materials to promote biomass-waste oxidation while improving the energy efficiency of alkaline hydrogen production. Data Content The provided files correspond to the following figures in the manuscript: Figure 2. (a) TGA curve of biomass waste in air. (b) TGA curves of biomass waste under a nitrogen atmosphere at heating rates of 10, 15, 20, and 25 °C min⁻¹. (c) DTG curves and Lorentz fitting results. Figure 4. (a) Cyclic voltammetry curves in 1 M NaOH and in 1 M NaOH containing 10 g L⁻¹ biomass waste. (b) Chronoamperometry at 1.1–1.8 V vs. RHE under the same conditions. (c,d) Concentration-dependent stepwise chronoamperometric responses of the carbon-based electrode in 1 M NaOH containing 1 g L⁻¹ (c) and 10 g L⁻¹ (d) biomass waste, under successive potential steps from 1.1 to 1.8 V, followed by 1.1 to 1.6 V vs. RHE. (e) Long-term chronoamperometric stability at 1.6 V vs. RHE in 1 M NaOH containing 10 g L⁻¹ biomass waste. (f) Long-term chronoamperometric stability at 1.6 V vs. RHE, where the 10 g L⁻¹ biomass-waste electrolyte was replaced with fresh electrolyte after 4 h of operation. Methodology Electrochemical measurements were performed at 80 °C using an Origalys Origaflex potentiostat. A standard three-electrode membrane-less cell was employed. Working Electrode: Vulcan XC-72R deposited on carbon paper. Counter/Reference: A 2 cm × 1 cm glassy carbon sheet was used as the counter electrode, with an immersed active area of 1 cm × 1 cm. A Hg/HgO electrode in 0.1 M KOH was used as the reference electrode. Electrolyte: Electrochemical measurements were carried out in 78 mL of electrolyte, including 1 M NaOH as the control electrolyte and 1 M NaOH containing 1 g L⁻¹ or 10 g L⁻¹ wine-industry biomass waste as biomass-containing electrolytes (pH = 14). Thermogravimetric analysis was performed using an SDT Q600 unit (TA Instruments). Funding:We would like to acknowledge the ffnancial support by the China Scholarship Council (Grant No. 202306810013), which funded the PhD grant for Jiamei Yang, the leading author of this work. This publicatton is part of the project PID2024-159516OB-C21 funded by MICIU/AEI/10.13039/501100011033 and by FEDER, UE. This work is also part of the EU-ELOBIO project. The project ELOBIO received funding from the European Union\u2019s Horizon Europe EIC-2021-PATHFINDERCHALLENGES 01-04, under grant agreement number 101070856. Views and opinions expressed are however those of the author(s) only and do not necessarily reffect those of the European Union or European Innovatton Council. Neither the European Union nor the granttng authority can be held responsible for them.