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Discussion Starter · #1 ·
At the turn of the 20th Century, Thomas Edison invented a battery with the unusual quirk of producing hydrogen. Now, 120 years later, the battery is coming into its own.

 

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The Nickel-Iron battery only has 1.2 V per cell so you need a lot of cells in series to get to a decent voltage, it's not a major problem for renewable energy support, at 25 Wh/Kg they wouldn't be worth considering for trasport. The high internal resistance isn't great and the self discharge at 20 - 30% per month is high but the research will probably improve both of these problems. They can also tolerate deep discharge which is great.
 

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At the turn of the 20th Century, Thomas Edison invented a battery with the unusual quirk of producing hydrogen. Now, 120 years later, the battery is coming into its own.

This battery has a really lossy round trip efficiency: belongs in the dustbin except for some niche applications.
 

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Discussion Starter · #5 ·
"While Mulder and his team knew that the nickel-iron battery’s electrodes were capable of splitting water, they were surprised to see that the electrodes started to have a higher energy storage than before hydrogen was being produced. In other words, it became a better battery when it was used as an electrolyser too. They were also surprised to see how well the electrodes held up to the electrolysis, which can excessively tax and degrade more traditional batteries. "And, of course, we were rather content that the energy efficiency appeared to be good during all this," says Mulder, reaching levels of 80-90%."

Don't think it is being suggested for mobile applications. But solar/wind storage and hydrogen production. The big failing of the renewables subsidies was not to include a storage requirement.
 
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