When I read the headline I thought to myself: Great, the tackled the overvoltage problem successfully. In electrolysis there are two parameters relevant: the current and the voltage applied. (An electrochemist once told me: voltage means costs, current means money). The current is directly proportional to the amount aluminum (in this case) produced, whereas the applied voltage is directly proportional to the energy involved in the process. So a minimization of the applied voltage means a huge increase in efficiency. But I was mistaken. I hope that these new electrodes are not consumed in the process, otherwise this would mean the overall efficiency would be greatly reduced and if that really means a reduction of carbon emission remains to be seen