With global warming concerns, the "hydrogen industry" is exploding, and the word "green hydrogen" is on everyone's lips. But until the cost is controlled, things will not change much.
The holy grail of the industry is to produce green hydrogen at a price of "1 USD/kg", and it is generally hoped that scale can reduce costs.
Leaving aside the scale for now, can technology help the goal of "1 USD/kg"? According to Chennai startups, the answer seems to be yes.
Prasanta Sarkar, a fluid mechanics expert, and Rochan Sinha, who is engaged in material development, proposed a prototype electrolytic cell that does not use membranes.
The membrane is used to separate the oxygen and hydrogen produced by water decomposition, because if the gases are mixed, they will explode.
Since membranes are expensive, if you cancel them, you can save a lot of money and operating costs.
"We redesigned the electrolyzer," Sarkar told Quantum, explaining that the electrolyzer they designed was not a membrane, but had "thousands of small reactors."
The website of their company NewTrace (newtrace.io) states that their electrolyzers are "5 times cheaper" and have a modular design that can be expanded to any capacity.
The device has many "flow channels" through which water flows; each side has an electrode made of nickel alloy.
Sarkar and Sinha 3D printed the electrodes.
Otherwise, the science behind the equipment is the same as a traditional electrolytic cell. You provide energy for water, and it breaks down into hydrogen and oxygen. In a traditional electrolytic cell, a membrane separates the two gases-any mixing can cause an explosion.
In the NewTrace electrolyzer, the high flow of the electrolyte in the tube and gravity are used for natural separation. Since the release of hydrogen and oxygen occurs on different electrodes, they can simply be washed away by the force of the electrolyte (sometimes through holes in the electrodes) before they cross and mix.
Sarkar said that the purity of hydrogen is also more than 99%.
In addition, because it is modular, any faulty parts can be replaced quickly and easily, he said.
Researchers are now working on "proof of concept" verification.
The prototype is being tested. "We are building a 100-kilowatt electrolyzer. By 2022, it will produce hydrogen at a rate of 1.63 kg/h; we plan to expand it to 1 MW by 2025 and will be able to produce 18.76 kg/h by then," Sarkar Tell Quantum.
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