Seawater could be a limitless source of hydrogen, but we need electrolysers that can handle the high salt concentration Shutterstock/andrejs polivanovs
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97 per cent of the water on Earth is in the ocean. If even a small amount of that could be harnessed to make hydrogen using clean energy, it would provide a practically limitless source of clean-burning fuel that would accelerate the transition away from fossil fuels. But there鈥檚 a catch.
The devices currently…
