Hidrojen üretiminin tahmini ve optimizasyonu

Two of the most important issues in the modern world are, on one hand, the availability of affordable, easily accessible, and abundant energy sources, and on the other hand, the continuously increasing environmental pollution since the Industrial Revolution. Although fossil energy sources meet a large portion of the world's energy demand, the limitations of these sources and their significant environmental pollution have made it necessary to seek alternative energy sources. As a result, there is a growing interest in renewable energy sources today. Among these sources, solar, wind, and hydrogen energy are prominent. One of the biggest challenges of renewable energy sources is the storage issue. Hydrogen emerges as a significant long-term alternative to address this problem. It is possible to produce and store hydrogen using other renewable energy sources. Hydrogen obtained through the electrolysis of water is known as green hydrogen. Compared to hydrogen produced from fossil fuels, green hydrogen produces significantly fewer emission gases. This thesis aims to optimize the results obtained by using different electrodes in hydrogen production through the electrolysis of water with the response surface method (RSM). In this study, a laboratory-scale two-electrode system was set up for hydrogen gas production using an alkaline electrolysis cell. Initially, graphite was used as the anode and mild steel electrodes as the cathode. Later, platinum, a noble metal, was used as the anode, while graphite electrodes were preferred as the cathode. These graphite electrodes were modified with nickel-cobalt-molybdenum (NiCoMo) using a galvanostatic method. In both studies, electrode voltage and molarity time were selected as independent factors. Using the Design-Expert program (trial version), the effects of these independent factors on hydrogen production were statistically interpreted. One of the main advantages of this method is that it allows for the examination of various parameters with a small number of experimental performances. Experimental results have shown that the amount of hydrogen produced increased as the voltage value rose from 2.5 volts to 3 volts in all experiments. Similarly, an increase in hydrogen production was observed as the molarity increased from 0.5 M to 1.5 M across all experiments. For the NiCoMo-modified graphite electrode, the optimum desirability was found to be 0.890 with 10.67 mL of hydrogen produced under ideal conditions of 3V voltage and 1.5 M molarity. In terms of the coefficient of determination, R2, the adjusted R2 and predicted R2 values were determined to be 98.81%, 97.96%, and 91.63%, respectively. Validation test results demonstrated a good agreement between the experimentally obtained hydrogen volumes and the predicted hydrogen volumes.