No, the principle is as follows——
If the electrolyte solution is an alkaline solution, the reaction formula of the negative electrode is: 2H2 + 4OHˉ-4eˉ== 4H20 The electrode positive is: O2 + 2H2O + 4eˉ== 4OHˉ
If the electrolyte solution is a saline solution, the reaction formula of the negative electrode is: 2H2-4eˉ=4H (cation), and the positive electrode is: O2+4eˉ+2H2O= 4OHˉ
Fuel is supplied to the negative electrode during operation (hydrogen), providing an oxidant (air, the active ingredient is oxygen) to the positive electrode. Hydrogen is broken down into positive H+ ions and e- electrons at the negative electrode. Hydrogen ions enter the electrolyte, while electrons move along the external circuit towards the positive electrode. The electrical load is connected to the external circuit. On the positive electrode, oxygen from the air and hydrogen ions from the electrolyte absorb the arriving electronsto the positive electrode to form water. This is the reverse process of the water electrolysis reaction.
What is the working principle of hydrogen-oxygen fuel cell?
Hydrogen-oxygen fuel cells do not convert thermal energy into electrical energy, but use the principle of primary cells.
Generally, fuel cells have two rods of fuel, which are the positive and the negative. The battery electrodes. Hydrogen-oxygen fuel cells generally have a honeycomb structure that can absorb hydrogen and oxygen. The positive electrode is oxygen and the negative electrode is hydrogen. When the battery generates a circuit, the following chemical process occurs: p>
Anodic oxidation: O2+2H2O +4e---4OH-
Anodic reduction: 2H2-4e--4H+
In the battery, the negative ions will be transferred to the negative electrode and the positive ions will be trtransferred to the positive electrode, thereby producing a current return, of which the direction of current inside the battery is often said to be from the negative electrode to the positive and opposite electrode outside the battery . p>
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A Fuel cell is a chemical battery that uses the energy released when substances undergo chemical reactions to convert it directly into electrical energy. From this point of view, it is similar to other chemical batteries such as manganese dry batteries, lead acid batteries, etc. However, when it works, it needs to continuously supply reaction substances, fuel and oxidant, which is different from other ordinary chemical batteries. Because it converts the energy releasedEducated by fuel during chemical reactions into electrical energy, it is called a fuel cell. More specifically, a fuel cell is a “generator” that uses the reverse reaction of water electrolysis. It consists of a positive electrode, a negative electrode, and an electrolyte plate sandwiched between the positive and negative electrodes. Initially, electrolyte plates were formed by infiltrating electrolytes into porous plates, but they are currently being developed to use solid electrolytes directly. During operation, fuel (hydrogen) is supplied to the negative electrode and oxidizer (air, the active ingredient is oxygen) is supplied to the positive electrode. Hydrogen is broken down into positive H+ ions and e- electrons at the negative electrode. Hydrogen ions enter the electrolyte, while electrons move along the external circuit towards the electrodepositive. The electrical load is connected to the external circuit. On the positive electrode, oxygen from the air and hydrogen ions from the electrolyte absorb electrons arriving at the positive electrode to form water. This is correct. This is the reverse process of the water electrolysis reaction. Thanks to this principle, the fuel cell can continuously transmit energy to the outside during operation, which is why it can also be called a “generator”. Generally speaking, when writing the chemical reaction equation of a fuel cell, you should pay close attention to the acidity and alkalinity of the electrolyte. The electrode reaction that occurs on the positive and negative electrodes is not isolated, but is often closely related to the electrolyte solution. For example, there are two types of hydrogen-oxygen fuel cells: acidic and alkaline. In acid solution, the reaction formula of electrnegative electrode is: 2H2-4e-==4H+ and the positive electrode reaction formula is: O2 + 4H+ +4eˉ= = 2H2O; in an alkaline solution, then it is impossible for H+ to appear, and in an acidic solution, it is impossible for OHˉ to appear. If the electrolyte solution is an alkaline or saline solution, the reaction formula of the negative electrode is: 2H2 + 4OHˉ-4eˉ== 4H20. The positive electrode is: O2 + 2H2O + 4eˉ== 4OHˉ. the reaction formula of the negative electrode is: 2H2-4eˉ=4H+ (cation), the positive electrode is: O2+4eˉ+4H+=2H2O. The memory rules are as follows: Under alkaline conditions, it is easy to memorize the O2 of the positive electrode. H2O, eˉ and 4OHˉ. The previous coefficients are 1, 2, 2 and 4 respectively, then simply use subtract the formula above from the total reaction equation. Under acidic conditions, it is easy to remember the negative electrode reaction formula (4H+) + (-4eˉ) = 2H2. By moving theIn these terms, the required equation can be obtained. Similarly, the positive electrode reaction formula is obtained by subtracting the positive. electrode reaction formula from total reaction formula. Hydrogen-oxygen fuel cell is a battery that uses hydrogen as a fuel and oxygen as an oxidant to convert chemical energy into electrical energy through the fuel combustion reaction. When the hydrogen-oxygen fuel cell is operating, hydrogen is supplied to the hydrogen electrode and oxygen is supplied to the oxygen electrode. Hydrogen and oxygen pass through the electrolyte to generate water under the action of a catalyst on the electrode. At this time, there is an excess of electrons on the hydrogen electrode and they are negatively charged, and the oxygen electrode is positively charged due to the lack of electrons. Once the circuit is ignited, this combustion-like reaction process can occur.pursue.