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E3S Web of Conferences 181, 01003 (2020) ICSREE 2020 Fig. 7. Equal phase magnetic force on both coated electrode The magnetic force plays role to raise kinetic energy of water. However, the induced magnetic field by both electrode are in equal phase when both electrode coated by curcumin as shown at figure 5. This equal phase proven by the hydrogen concentration released of both coated electrode during the electrolysis which shown at figure 4, yields lowest hydrogen concentration and inhibit the electrolysis process. Compared to previous research in water electrolysis using aluminum electrode, curcumin coated electrode have better performances. Hydrolytic reaction of aluminum foil hydrolysis in alkalized water only able to produce 1300 ppm of hydrogen gas in 5 hours [10]. More over this technique is less friendly to the environment due to the potential of soil toxication by alkalized water waste [11]. While in our study which is more environmental friendly, by applying organic substance, curcumin coated to the electrode is able to produce 5367 ppm in around 1.5 hours. This is around ten folds larger. The recent technology of water electrolysis using proton exchange membrane (PEM) with pt/c electrode is still the most efficient and effective hydrogen production technique using water electrolysis. However, the capital cost needed to build PEM hydrogen production system is the highest among other water electrolysis technique [12]. Curcumin coated electrode can be used as an alternative solution to build cheaper but effective electrolyzer using organic substance. 4 Conclusions This paper has shown the alternative and more sustainable way to produce hydrogen through water electrolysis using antioxidant catalyst and show the potential of curcumin as one of polyphenolic antioxidant as an organic catalyst. This approach leads to the metal free water electrolysis and not needed any noble material. This technique is possible because of electron donor effect by the delocalized electron contained in aromatic ring transferred to the electrode material and increase the http://doi.org/10.1051/e3sconf/202018101003 current density. The electron donor effect of curcumin phenol ring structure coated on cathode reported in this study for the first time and lead to the metal free sustainable organic catalyst for water electrolysis. This study is made possible by Indonesia Ministry of Research and Higher Education (KEMENRISTEKDIKTI) under PMDSU program with grant number [147/SP2H/LT/DRPM/2018]. References 1. J. A. Turner, Science (80-. ). 305, 972 (2004) 2. L. Yang, W. Liu, Z. Zhang, X. Du, J. Gong, L. Dong, and Y. Deng, Electrochim. Acta 246, 1163 (2017) 3. Z. M. Marković, D. P. Kepić, D. M. Matijašević, V. B. Pavlović, S. P. Jovanović, N. K. Stanković, D. D. Milivojević, Z. Spitalsky, I. D. Holclajtner- Antunović, D. V. Bajuk-Bogdanović, M. P. Nikšić, and B. M. Todorović Marković, RSC Adv. 7, 36081 (2017) 4. Y. X. Chen, A. Lavacchi, H. A. Miller, M. Bevilacqua, J. Filippi, M. Innocenti, A. Marchionni, W. Oberhauser, L. Wang, and F. Vizza, Nat. Commun. 5, (2014) 5. A. D. Wright, C. Verdi, R. L. Milot, G. E. Eperon, M. A. Pérez-Osorio, H. J. Snaith, F. Giustino, M. B. Johnston, and L. M. Herz, Nat. Commun. 7, (2016) 6. S. Çakir, E. Biçer, and E. Y. Arslan, Croat. Chem. Acta 88, 105 (2015) 7. O. Leenaerts, B. Partoens, and F. M. Peeters, Phys. Rev. B - Condens. Matter Mater. Phys. 77, (2008) 8. M. A. Molina-García and N. V. Rees, Appl. Catal. A Gen. 553, 107 (2018) 9. M. A. Atanga, F. Rezaei, A. Jawad, M. Fitch, and A. A. Rownaghi, Appl. Catal. B Environ. 220, 429 (2018) 10. C. Y. Ho, Int. J. Hydrogen Energy 42, 19622 (2017) 11. C. Gao, Q. Zhao, and L. Jiang, Proc. Natl. Acad. Sci. U. S. A. 112, 2931 (2015) 12. O. Schmidt, A. Gambhir, I. Staffell, A. Hawkes, J. Nelson, and S. Few, Int. J. Hydrogen Energy 42, 30470 (2017) 4PDF Image | curcumin coated electrode on hydrogen production through water electrolysis
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