The main difference between water-hydrogen fuel cells and regular batteries is that dry cells and batteries are energy storage devices that store electrical energy and release it when needed, while water-hydrogen fuel cells are strictly speaking a power generation device, like; A power plant is an electrochemical power generation device that directly converts chemical energy into electrical energy. \x0d\ Large power plants, whether hydroelectric, thermal or nuclear, send the electricity they produce to the grid, which then delivers it to users. However, due to the different loads of each electricity user, the electricity grid sometimes experiences peak peaks and sometimes low peaks, which can lead to power outages or voltage instability. In addition, approximately 70% of the energycombustion of traditional thermal power plants is consumed in huge equipment such as boilers and turbogenerators. During combustion, a large amount of energy is consumed and a large amount of harmful substances are emitted. Using water-hydrogen fuel cells to generate electricity directly converts the chemical energy of the fuel into electrical energy without burning. The energy conversion rate can reach 60%-80%. The device can also be less polluting and less noisy. big or small, and is very flexible. \x0d\ The basic principle of water-hydrogen fuel cell power generation is the reforming of methanol to produce hydrogen power. The products of the water-hydrogen fuel cell are electricity and water. The specific reaction process is as follows: hydrogen on the battery anode is decomposed into protons and electrons under the action of catalysisur. Positively charged protons pass through the separator to the cathode, and negatively charged electrons flow in the external circuit. thus generating electrical energy. The oxygen ions present on the cathode combine with electrons and protons under the action of the catalyst to form water. A battery with a large number of fuel cells connected in series can generate enough electricity to drive a car. \x0d\ Characteristics of hydrogen and water fuel cells \x0d\ (1) No pollution. Hydrogen fuel cells do not pollute the environment. It uses electrochemical reactions instead of the more typical traditional backup power solutions using combustion (gasoline, diesel) or energy storage (battery). Combustion releases pollutants such as COx, NOx, SOx gases and dust. As mentioned above, water-hydrogen fuel cellsonly produce water and heat. \x0d\ (2) No noise. The fuel cell operates quietly, with noise below 55 dB, which is below the level of normal conversation. This makes water-hydrogen fuel cells suitable for indoor installation or where there are exterior noise restrictions. \x0d\ (3) High efficiency. The power generation efficiency of fuel cells can reach more than 50%. This is determined by the conversion properties of fuel cells, which directly convert chemical energy into electrical energy without the need for intermediate conversion of thermal energy and machinery (generator). \x0d\With the development of hydrogen production technology, hydrogen and water fuel cells are getting closer and closer to our lives. In the near future, methanol will be transported to thousands of homes through pipelines like eau, and each user will be connected to a water-hydrogen fuel cell and then connected to various electrical equipment. This will create a comfortable living environment for people and ease the heavy tasks of life. I hope that this new clean and convenient energy source - water-hydrogen fuel cells - will be used in people's daily lives as soon as possible.
If water is electrolyzed, how many kilowatt hours of hydrogen can be produced from one kilogram of water?
Most people know that this is a very simple question.Just turn on the hydrogen~
Actually, water on earth comes from this. We all know that hydrogen is the most common element in the universe. Why is there so little hydrogen on earth?
The answer is simple: most of the free hydrogen elements transformed into water~
The early Earth often encountered meteorite impacts and erevolcanic ptions, all of which would have caused violent oxidation of atmospheric hydrogen. reaction and becomes water.
The question itself has been answered, and now there is a new question. I think that's what most people want to ask: Is the poster stupid? I don't even know it.
In fact, I understand that the poster must have encountered a thought trap.
Why do you say that?
First we need to think about the circumstances under which we need to synthesize hydrogen and oxygen into water? This is certainly not necessary on Earth. Pure hydrogen and oxygen are rarer than water on Earth. This problem is most often encountered in space.
Hydrogen is very common in space, oxygen can also be encountered, water is relatively rare, and direct drinking water is even rarer. The original poster must have thought about it when imagining how to ensure survival humaine during future space travel.
In order to ensure human survival during long distance space navigation, we need to synthesize food, synthesize proteins, generate oxygen and also synthesize water. The author must have fallen into inertial thinking when thinking about the previous one. problems, and instead they neglected to move on. The easiest way is to burn synthetic water.
In a spacecraft, both hydrogen and oxygen are valuable. It is too useless to turn them on directly. A better way is to use hydrogen fuel cells, which can not only efficiently collect water, but also make full use of it. of hydrogen oxidation. The energy released is also safer.
A bottle of pure oxygen, a bottle of pure hydrogen, a match, a box of matches, open the valve, mix the hydrogen and oxygen thoroughly andlight the match... Let's see if we can meet with a qualified doctor. Although the suture The technical requirements are low, but it takes a highly qualified doctor to find human tissue from a pile of explosives! ! ! ! !
This is a very simple chemical reaction. Everyone who has graduated from high school should know that hydrogen will turn to water when ignited. This is also the trend of new energy development in the future.
Hydrogen energy vehicles, as the name suggests, are vehicles that use hydrogen as an energy source. They convert the chemical energy generated by the hydrogen reaction into mechanical energy to propel the vehicle.
There are two types of hydrogen vehicles. One is a hydrogen internal combustion engine vehicle (HICEV), which uses an internal combustion engine to burn hydrogen (usually obtainedu by decomposition of methane or electrolysis of water) in order to produce electricity. propel the vehicle. Hydrogen fuel cell vehicle (FCEV) is a vehicle that reacts hydrogen or hydrogen-containing substances with oxygen in the air in a fuel cell to produce electricity needed for driving an electric vehicle.Machine, the vehicle is powered by an electric motor.
The widespread use of hydrogen as a transport energy source is a key element of the hydrogen economy.
The biggest advantage of using hydrogen as energy is that it reacts with oxygen in the air and produces only water vapor, effectively reducing the air pollution caused by traditional gasoline vehicles.
HICEV is generally based on an improved internal combustion engine. It is not difficult to implement. The difficulty lies in theway to reduce costs and ensure safety, and to safely resolve hydrogen supply and storage issues. it can be launched on the market.
High-speed vehicles, buses, submarines and rockets already use hydrogen in different forms.
At the recent 2nd Import Expo, in addition to a wide variety of daily products, there were also very rich automobile exhibitions. Because China's automobile market is now the largest in the world, various foreign brands are all taking it. very seriously. This time, Honda Cars directly presented its trump card. An all-new hydrogen fuel cell sedan was on display in stand position C. This car is called CLARITY. In terms of appearance, it's actually somewhat similar to the Honda. Agreement.
The front part of the car adopts the design language of the Honda family, but the headlights of theThe sides are narrower and longer, using the currently popular LED matrix light source, but an LED daytime running light is also extended underneath. the headlights to illuminate the car. It can then form a fang shape, somewhat similar to Cadillac's design style. The side of the vehicle has a very typical coupe shape, and the body adopts a two-tone design. What's more interesting is that the rear wheels are semi-enclosed, and a flat spoiler is added above the wheel arches to further reduce the impact. wind resistance coefficient.
The length of the whole car reaches 4915mm, and the size is slightly larger than that of the Honda Accord. However, since it is a hydrogen fuel cell car, the hydrogen storage tank takes up a lot of space, so. the rear seat of the vehicle The space for the seats is not particularly large and is basically the samethan that of the current Honda Accord. After adding the hydrogen storage tank and battery, the weight of the whole car reaches 1,890 kilograms, which is significantly higher than the same level of fuel vehicles. However, the battery is mainly placed in the chassis of the car, therefore in the center. gravity is very low, which makes driving easier.
The questioner can try,
The first step: take a deep breath of hydrogen, press it into the Dantian, and then perform the exercises for three weeks.
Step 2: Facing the oxygen cylinder, open the valve.
Step 3: Aim at the large iron plate above your head, slowly spray hydrogen gas through your nose, and light the lighter.
Step 4: While alive, use your mouth to suck up the condensed water on the iron plate.
Do not question the poster's IQ or dwell onr the question: “How did a person with such an IQ learn to type?” » We all know that there is a high probability that the poster does not have a disability in terms of IQ, but is simply shameless, likes to mistreat himself and does not know how to love and respect himself.
Find two glasses and a cup, fill the cup with hydrogen and oxygen in a volume ratio of 2:1, place an atomic bomb in the other cup, then use a glass tube to connect the two quilts to form an interconnected and integral system, and seal the system. Find a match and light the atomic bomb. The atomic bomb explosion generates enormous pressure and compresses the hydrogen and oxygen in the water.
Impossible. Hydrogen is much lighter than oxygen. After synthesis, it carries oxygen and flies away without a trace. Humans cannot fly and will die if they cannot breathe oxygen. If you don't studyz not hard, you will really be fooled to death!
Is the questioner asking about circulating water supplies for space travel? You can refer to fuel cells, which can provide both energy and clean water. So when traveling in space, just bring enough water. Nuclear power/solar panels can be used to generate electricity, split water to produce hydrogen and oxygen reserves, and the sources of oxygen and water have also been resolved. There is currently a lack of practical technology to convert carbon dioxide into carbonaceous oxygen.
It is perfectly possible to combine hydrogen and oxygen in water.
1. Ignite the hydrogen and burn it in oxygen.
The hydrogen must be pure hydrogen (not mixed with oxygen), otherwise it will explode and pwill cause safety accidents. When hydrogen and oxygen are mixed and ignited to form water, it also explodes because the hydrogen and oxygen are in direct and complete contact, causing a violent chemical reaction and releasing a large amount heat.
2. Hydrogen-oxygen fuel cell.
Hydrogen-oxygen fuel cells convert thermal energy from the chemical reaction of hydrogen and oxygen into electrical energy, thereby improving energy utilization and making the chemical reaction gentler. The product of this fuel cell is water, with hydrogen as the negative electrode and oxygen (which can also be oxygen in air) as the positive electrode. Under the action of the catalyst, hydrogen loses electrons to form hydrogen ions, and oxygen gains electrons to form negative oxygen ions. Electrons movein the external circuit to form an electric current, and the hydrogen ions and oxygen anions combine to form water inside the fuel cell.
Burn hydrogen to get water and heat.
Decomposition of water, hydrogen, oxygen, production of hydraulic energy?
The electrolysis of water to produce a kilogram of hydrogen requires 56 kWh of electricity. Electrolysis of water to produce a standard cubic meter of hydrogen requires about 5 kilowatt hours of electricity. The calorific value of 1 kilogram of hydrogen is equivalent to approximately 33 kW/h (kWh) of electricity. The power generation efficiency of hydrogen fuel cells typically operates between 40% and 60%. Typically calculated based on 50% efficiency, 1 kilogram of hydrogen can produce electricity at around 16 degrees Celsius. 11.2 The standard cubic meter of hydrogen is equivalent to 1 kg. Therefore, the power consumption of water electrolysis to produce 1 kilogram of hydrogen is approximately 56 kilowatt hours.
Principle of hydrogen production by electrolysis of water:
When a direct current is passed through certain electrolytic aqueous solutions, the substances decomposed have nothing to do with the What decomposes is water as a solvent, and the original electrolyte remains in the water. For example, sulfuric acid, sodium hydroxide, potassium hydroxide etc. belong to this type of electrolytes. ?During water electrolysis, because the ionization degree of pure water is very low and its conductivity is low, it is a typical weak electrolyte. Therefore, it is necessary to add the aforementioned electrolyte to increase the conductivity of the solution so that water can. Be electrolyzed into hydrogen and oxygen smoothly.
Reference for contained above: Baidu Encyclopedia - Hydrogen production from water electrolysis
Hydroelectricity production can drive a generator with the kinetic energy of water to convert it directly into electrical energy. Energy. There is no need to decompose the water and then ignite the hydrogen to release hydrogen. It is possible to use hydrogen as a fuel, but electrolysis is the only way to directly break down water. ． It’s very, very energy consuming! ! If hydrogen is to be produced in large quantities, it can be produced by hydrocarbon cracking, carbohydrate decomposition, water and gas separation, etc. There are many ways.