A record in the US hydrogen production technology: 7 × 24 hours without interruption!
Researchers at Stanford University in the United States have invented a low-cost water separator. Both the yin and yang electrodes use the same kind of catalyst to oxidize nickel-iron. They can produce hydrogen and oxygen 24 hours a day, seven days a week, providing clean and renewable water and industrial fields. Hydrogen energy. The research results were published in the recently published journal Nature Communications.
Cui Yi, a co-author of the study and an associate professor at Stanford University, said: "This low-pressure separator with a single catalyst can work continuously for more than 200 hours to break down water to produce hydrogen and oxygen, a world record performance. â€
Hydrogen is a clean energy without emissions, but it needs to be produced on a large scale by natural gas, which is a global fossil fuel that causes global warming. Scientists have been trying to develop an inexpensive way to extract pure hydrogen from water.
Conventional water cracking devices are mainly immersed in an aqueous electrolyte by two electrodes. At present, low-voltage current is applied to the electrode to catalyze the separation of water molecules, one electrode releases hydrogen and the other electrode releases oxygen. Each electrode uses a different catalyst, typically two rare and expensive metals, platinum and rhodium.
In 2014, Stanford University chemist Dai Hongjie developed an inexpensive separator for water that was run from a common 1.5-volt battery made of nickel and iron. The new research will further advance this technology. The researchers say that the uniqueness of the new water separator is that the two electrodes use the same catalyst, nickel oxide-iron. This dual-function catalyst can continuously decompose water for more than a week, with a constant voltage of 1.5 volts, pushing the water separation efficiency up to 82% at room temperature.
According to a network of physicists, researchers have used lithium-ion battery technology to find a low-cost catalyst that can simultaneously drive both poles. In order to find a catalytic material suitable for the two electrodes, they borrowed electrochemical adjustments guided by lithium technology in battery research to chemically convert the metal oxide catalyst into small particles, so that the catalyst has better conductivity. And stability.
In conventional water separators, hydrogen and oxygen catalysts often require electrolytes of different pH values. In order to decompose water, it is necessary to separate the two electrolytes, which increases the cost of the apparatus. Now, water separators using the same catalyst can be operated efficiently with a uniform pH electrolyte. Catalyst Nickel Oxide is inexpensive and easy to produce and is more stable than precious metal catalysts.
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