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E3S Web of Conferences 181, 01003 (2020) http://doi.org/10.1051/e3sconf/202018101003 ICSREE 2020 The effect of curcumin coated electrode on hydrogen production through water electrolysis Willy Satrio1,*, Winarto1, Sugiono2, and I.N.G Wardana1 1Dept. of Mechanical Engineering, Brawijaya University, 65144 Malang, Jawa Timur, Indonesia 2Dept. of Industrial Engineering, Brawijaya University, 65144 Malang, Jawa Timur, Indonesia Abstract. Hydrogen as the most cleanest energy source promise polutant free combustion. However, hydrogen production process still have negative impact on environment. Water electrolysis as one of hydrogen production process leave toxical gas residue and if the catalyst used in the process is metal catalyst it will leave metal waste which have potential to pollute soil and water. Curcumin as polyphenol antioxidant have potential as electrocatalytic agent due to its electron donor behavior. Curcumin loaded aluminum electrode coated by mechanical coating technique using water as solvent perform better as electrode compared to non-coated electrode. Curcumin coated cathode, anode and both electrode produce more hydrogen in shorter time than non-coated electrode. Curcumin electron donor increase the current density flows through the electrodes which is lift up the efficiency of water electrolysis process. 1 Introduction Hydrogen is the cleanest and the most economically eficient fuel which promise pollutant free combustion [1]. Hydrogen can be obtained from water using water electrolysis technique. As a clean fuel hydrogen production process still have negative impact on environment. Water electrolysis requires noble metal catalysts and using acid or base solvent as conductance so the water can become more conductive. The usage of metal catalyst can leave metal residue which able to pollute soil and water. Acid or base solvent can produce toxical gas residue such as chlorine [2]. Curcumin electron donor potential has been observed as the antibacterial agent. The presence of curcumin on bacterial colloid can increase the zeta potential of the colloids and the combination of curcumin and graphene has the best performance to kill positive gram bacteria and break negative gram bacteria peptidoglycan cell wall in 8 hours duration using dim light photocatalysis technique [3]. The electron donor from the curcumin has potential to destabilize the electrons in water. Therefore, our study This research will apply curcumin electron donor potential to increase the efficieny of water electrolysis to create green water electrolysis technique. Curcumin as the polyphenolic antioxidant have excess electron on its phenol aromatic structure [4]. Delocalized electron in aromatic structure create a resonance over time and the presence of oxygen in hydroxil functional group bend over the molecular orbital of aromatic ring since oxygen acting as electron scavenger [4,5]. Curcumin act as reduction agent because its donate electron to stabilize free radical or other electron scavenger substance. Curcumin transfer the electron to free radical by creating electrostatic attraction to other molecules through * Corresponding author: willy13101307@gmail.com hydroxyl functional group. Curcumin also able to create chelation with metal. Recent study report the curcumin chelated Fe3+ reduced to Fe2+ as the curcumin donate its electron to metal ion [4]. In this study, we report the electron donor effect of curcumin with the presence of delocalized electron able to increase current density in water electrolysis and reduce oxygen on electrode. We also investigate the effect of curcumin coating which able to help reduce the energy needed to break the water molecule in electrolysis. 2 Material and Methods 2.1 Curcumin Coating Curcumin used in this experiment was obtained from JamuTM brand curcumin extract powder which contains only curcumin. The curcumin coating process was using water medium [6]. The aluminum electrode was plunged into well stirred water-curcumin solution which stirred untill the water color changed to yellow and soaked for 12 hours in the solution in a closed manner to avoid contact with oxygen to prevent curcumin from oxidation. After the electrode dried, the electrolysis test was ready to conduct. Curcumin coating process shown in figure 1 (a) and the coated and uncoated electrode presents in figure 1(b) and 1(c) respectively. © The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).PDF Image | curcumin coated electrode on hydrogen production through water electrolysis
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