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E3S Web of Conferences 181, 01003 (2020) ICSREE 2020 http://doi.org/10.1051/e3sconf/202018101003 Fig. 1. (a) Curcumin Coating Process; (b) Uncoated Electrode; (c) Curcumin Coated Electrode 2.2 Conductivity Testing The conductivity test was conducted using 12V Battery as electricity source. The test was performed by pluging both cathode and anode to the coated rod and uncoated rod. 10 kohm resistor was placed on anode side due to the electron flow of battery from cathode to anode. The rod was connected to the battery using medium sized alligator clip. The multimeter was placed on both alligator clips to meassure the current flows. The electrical current data were measured in every 10 seconds. The apparatus setup of electrical conductivity is shown in figure 2. Fig. 3. Water Electrolysis test Apparatus Setup 3 Result and Discussion 3.1 Curcumin Increase Electron Density The conductivity test was obtained by measuring the current flow pass through the material for 30 times. The material measured was noncoated rod, curcumin coated rod, activated carbon coated rod, and Curcumin- activated carbon coated rod. The result is shown in figure 4. Fig. 2. Conductivity test Apparatus Setup 2.3 Water Electrolysis Test The water electrolysis test was conducted in 250ml half filled glass leave out 125m1 room for the gas and equipment. The source of electricity was 12V battery and the cathode material was aluminum rod. The measurement was conducted using MQ8 hydrogen gas sensor interfaced with arduino board to the computer using load resistance of 10.31 kohm. The sensor placed beside the anode which attached to circular styrofoam as a cover. The apparatus design is shown in figure 3. Fig. 4. Results of Conductivity Test The electrical current flow in coated aluminum rod is higher than non-coated aluminum plate due to the electron donor from the aromatic ring to the material which causes the electron density on the material lattice getting higher and the current density which flow through the rod increased. Increase of electron density also helps aluminum to reduce the oxygen attached on the material surface and free them [7]. The reduced amount of electron scavengers increase the electron mobility on the material surface so, the electrons can travel through material lattice freely without creating electrostatic attraction with oxygen nucleus which shown by reduced resistance factor and increased current [8]. There is no significance difference between activated carbon coated anode,curcumin coated anode, and mix coated anode conductivity as the average measurement of electrical current flow are 4.915 A, 4.873 A, and 4.929 A respectively. This shows the symptom of electron donor 2PDF Image | curcumin coated electrode on hydrogen production through water electrolysis
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