Why does it take a long time to pre-electrolyze water in water electrolysis?

Introduction Why does it need to be pre-electrolyzed during water electrolysis? During the process of water electrolysis, electrical energy is not only consumed by the decomposition of water, but part of the electrical energy is also converted into thermal energy and

Why does it take a long time to pre-electrolyze water in water electrolysis?

In the process of water electrolysis, electrical energy is not only consumed by the decomposition of water, but part of the electrical energy is also converted into thermal energy and lost. In fact, the efficiency of water electrolyzers used in industry is often between 60. -80%

The specific efficiency depends on the operating pressure, operating voltage, current and many other parameters of the electrolyzer. Simply put, if 100 parts of electrical energy are consumed in the process of electrolysis of water, only 60-80 parts of the energy is used for the water to be converted into hydrogen and oxygen. If the reaction of hydrogen and oxygen is used to produce electricity,

there are generally two ways:

The first is to directly convert the hydrogen and oxygen via a fuel cell. Battery conversion technologyfuel is still essentially at the experimental stage;

The second is to obtain thermal energy by burning hydrogen and oxygen. the motor is driven to generate mechanical energy, then a generator is used to convert the mechanical energy into electrical energy. The conversion efficiency of this process is often only 30-40%. Therefore, the overall efficiency of electrolysis of water then utilization of hydrogen and electrical energy. the oxygen content to generate electricity is generally between 18 and 56%. Therefore, unless it is for special purposes such as experiments, this approach is not used.

A question should be clearly worded so that everyone can help you answer it . he.

You feel like you're imagining a bubble floating on the seabed, pushing the generator along the way. Furthermore, this bubble will becomea gets bigger and bigger, and its buoyancy will also become bigger and bigger, right?

Someone asked this question. It relies on the electrolysis of water to create bubbles on the seafloor, then drives a generator to achieve perpetual motion. But this is actually impossible because the energy consumed to create a bubble on the seabed is greater than the buoyancy potential energy of the bubble.

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