India, Dec. 16 -- Technology choices in electrolysers can significantly alter how "green" green hydrogen really is, with certain designs producing up to 25 per cent lower emissions over their lifetime but at the cost of higher material intensity, according to a new study by researchers at IIT Madras.

The research shows that proton-exchange membrane (PEM) electrolysers with coated bipolar plates deliver cleaner hydrogen over their operational life despite higher emissions during manufacturing, underscoring the need for careful technology selection as India scales up its green hydrogen ambitions.

The study, led by Satyanarayanan Seshadri of IIT Madras in collaboration with the Centre for Study of Science, Technology and Policy (CSTEP), pr...