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The University of New South Wales, Australia, released a report a few days ago that researchers at the university have invented a new type of electrode that can electrolyze water at a low cost and with high efficiency. It is expected to be used for the large-scale production of clean fuel, hydrogen. This technology uses a low-cost, special-coated foam-like material that can quickly dissipate the oxygen bubbles generated by the electrolyzed water, thereby improving the production efficiency. Related papers were published in the recent British "Nature News" magazine.
Researchers say that this type of electrode is the most efficient electrode for producing oxygen in alkaline electrolytes. It uses nickel and iron as raw materials, is inexpensive and easy to manufacture, unlike other electrolyzed water technologies that require precious rare metals as catalysts and electrode materials.
In the process of electrolyzing water, water is decomposed into hydrogen and oxygen under the action of current. Oxygen-producing electrodes have low efficiency, high cost, and need to consume large amounts of electricity, and are one of the major technical difficulties in the industrial production of hydrogen produced by electrolysis of water.
The researchers used the common nickel foam on the market and electroplated it with a highly active nickel-iron alloy catalyst to make the electrode. There are many micropores inside the foamed nickel material, about 200 microns in diameter, which is about twice the diameter of human hair. The ultra-thin nickel-iron alloy coating also has a large number of micro-holes, about 50 nanometers in diameter.
Because the plating and the interior are filled with micropores, the surface area of ​​the new electrode is very large, which is beneficial to the release and dissipation of oxygen generated during the electrolysis process. Oxygen bubbles do not dissipate quickly enough, which is a common problem in reducing electrode utilization.
The researchers said that they will further study the principle and optimize performance to help achieve low-cost hydrogen production as soon as possible. The product of hydrogen combustion is water. It does not produce carbon dioxide and other pollutants. It is a clean and highly efficient energy source. If it can be produced on a large scale and at low cost, it will help meet the world’s growing energy demand, and reduce pollution and curb pollution. global warming.
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