At present, in addition to the technology of photocatalytic hydrogen production by water splitting, which dates back to 1972, two professors, Fujishima A and Honda K from the University of Tokyo, Japan , were the first to report the phenomenon of unique TiO2. a crystal electrode splitting water photocatalytically to produce hydrogen. Until now, no very good catalyst has been found that can quickly decompose water into hydrogen and oxygen.
Water cannot replace gasoline as a fuel; water is not flammable and cannot be used as fuel. Hydrogen is produced by the decomposition of water under certain conditions and can be used as fuel. It is impossible for water to transform into gasoline because the two components are different; otherwise it would violate the law of conservation of mass.
Hydrogen and oxygen have higher energy than water, so the combination of the twox in water releases energy, while the breakdown of water into hydrogen and oxygen requires energy. Hydrogen and oxygen in water are in a very stable (very low energy) state. If water can produce a substance with less energy through chemical changes, water can be used as fuel to release energy. However, the current earth environment and the accumulation of human chemical knowledge over hundreds of years have not yet discovered this substance, so water cannot yet be used as fuel on earth .
The existence of hydrogen bonds affects the morphology, chemical activity, etc. fabrics. Hydrogen bonds in water make water very stable. Only a high temperature of around 1300°C or electricity can decompose water into oxygen. and hydrogen (volume ratio 1:2) Since the cost of water electrolysis and decompositionof water at high temperature is too high, scientists are looking for a new type of catalyst that can turn water into hydrogen and oxygen at room temperature, but there is currently no report on this.
It is correct that the process of electrolysis of water to generate hydrogen is an endothermic process.
The process of electrolysis of water to generate hydrogen is endothermic. The process of electrolysis of water by direct current to generate hydrogen and oxygen is called water electrolysis. During the experiment, the temperature of the water will increase because the water acts as a conductor and the current generates heat.
The reverse reaction of water electrolysis is the combustion of hydrogen and oxygen to produce water, which is an exothermic reaction, therefore the electrolysis of water Water is an endothermic reaction. After electrolysis, the water itself eneutral st and other ions can be added, or it can be separated by a semi-permeable membrane to generate dual-property water. One of them is alkaline ionized water and the other is acidic ionized water.
Add electrolyte to conduct current and electrolytically dissociate water molecules. The negative electrode of the DC electrode emits hydrogen gas; the positive electrode emits oxygen. Hydrogen and oxygen can be collected using the drainage gas collection method, with a volume ratio of 2:1. The electrolyte mentioned above can be an ionic compound combined with a strong acid and a strong alkali, such as sodium chloride. However, in order to avoid the generation of chlorine gas at the anode, sodium hydroxide should be used as the electrolyte.
Hydrogen plutonium is not only considered as a fuel, but is also considered as a direct substitute for electricityity. It can be transported as natural gas through underground pipelines. Unlike electricity, it can be stored (usually in a liquid state at low temperature). Gases can be supplied continuously and stored in advance when energy demand is high. The hydrogen will be burned to produce heat or used in fuel cells to produce electricity.