No, although electrolyzed water does not pollute the environment during the reaction process, the reaction process of electrolyzed water is slow, the amount of hydrogen produced is not enough, and a large amount electricity is consumed, and electricity is generally generated by fire, water and wind, nuclear power, etc., there is a lot of energy loss in the process of generating electricity, the cost of water electrolysis is therefore very high. In particular, thermal electricity production is “high carbon” production.
The cost of electrolyzing water to produce hydrogen
It's certainly not cost-effective. If you can make it profitable, you will be the greatest scientist of the 21st century! Water is consumed in the ionization process. Electric energy belongs to secondary energy, which is a bit of a waste of energy. Under normal circumstances, the heatThe heat released when 1 mol (two grams) of hydrogen is burned is approximately 286 KJ, and the heat released! when burning, per kilogram of gasoline is approximately 46,000 KJ. The heat released by gasoline is approximately 46,000 KJ. The density is 0.72 to 0.74 g/ml. Take the average value and then calculate 0.73. 0.73*46000=33580KJ. The amount of hydrogen required is calculated to be 33580/286=117.4mol. The mol to volume conversion is 117.4*22.4 = 2629.76 liters, which is approximately equal to 2.6 cubic meters, so the heat generated by completely burning one liter. of gasoline requires completely burning 2.6 cubic meters of hydrogen to achieve the same effect. Regardless of the point of view, its use is very cost-effective and impractical!
1. How much energy is needed to produce hydrogen by electrolysis of water? 2. If the power is 100 W, how long does it take to produce 1 cubic meter (SPT) of hydrogen?
The cost of producing hydrogen by electrolysis of water is relatively high. The main reasons include the following aspects:
1. /p>< p>Producing hydrogen by electrolysis of water requires a large amount of electricity, and hydrogen is a fuel with high energy density. Therefore, the energy cost of producing hydrogen by water electrolysis accounts for a large part of the total cost. . This results in higher hydrogen production costs if traditional fossil energy sources are used. Therefore, how to use low-cost renewable energy (such as wind power and solar power) is a key question.
2. Cost of Electrolysis Equipment
Electrolysis of water to produce hydrogen requires the use of electrolysis equipment, including electrolyzers, electrodes, etc. This equipment requires requirementsspecial features such as resistance to high temperature, high pressure and corrosion, and manufacturing and maintenance costs are high. At present, the research and development of new electrolysis equipment is still in progress, but the price of commercial-scale production equipment is relatively high.
3. Raw material costs
Raw materials required for the preparation of electrolysis equipment, such as electrode materials, electrolytes, etc., also have an impact on costs. Some materials are more expensive, and the material stability, corrosion resistance and other properties must also be high, which increases the preparation cost.
4. Maintenance and operating costs
Long-term operation of electrolysis equipment requires maintenance and upkeep, which also requires a certain amount of energy and main work. These operating and maintenance costs also increase the overall cost of hydrogen production.
Although the current cost of hydrogen production by water electrolysis is relatively high, with the continuous progress of science and technology and the development of industry, the cost of Hydrogen production should be reduced. For example, with the development of new energy technologies, the cost of renewable energy continues to fall, which will provide a cheaper energy source to electrolyze water to produce hydrogen. At the same time, the development and application of new materials will also reduce the manufacturing cost of electrolysis equipment. Furthermore, as hydrogen production technology evolves, the scale of production expands, and market demand increases, production costs are also expected to decrease.
In general, the costof water electrolysis to produce hydrogen is one of the challenges facing the current hydrogen energy industry, but it can also be overcome. In the future, with the continuous progress of technology and market development, it is estimated that the cost of hydrogen production by water electrolysis will gradually decrease, thereby promoting the healthy development of the hydrogen industry. hydrogen energy.
1 cubic meter of hydrogen has a mass of 89.9 g and a heat of 14.3 × 10,000 × 89.9 = 12,855.7 kJ. The efficiency of electrolytic hydrogen production is typically around 55%. to produce 1 cubic meter of hydrogen: 12855.7kJ/55%=23374kJ, the time required for electrolysis with a power of 100W: 23374kJ/0.1=233740s=65h (hours)