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GREEN HYDROGEN COST REDUCTION Figure 22. Relationship between voltage (the higher, the lower the efficiency) and current density (the higher, the higher the production volume) for various diaphragm thickness of alkaline electrolysers. Source: Schalenbach et al., 2016. Re-designing catalyst compositions and electrode architectures into electrodes with a high specific surface area: Despite using cheap and widely available Nickelbased catalysts for their electrodes, alkaline electrolysers have traditionally encountered many challenges in moving away from rudimentary, or archaic electrode designs and reaching much higher efficiencies for both hydrogen and oxygen evolution reactions. Efficiency differences with other technologies are small and best-in-class designs result in even higher efficiencies. Table 2 shows a list with the ten main R&D aspects that need to be addressed, so that electrodes used in these stacks can be transformed and implemented in more advanced stack concepts. 58PDF Image | GREEN HYDROGEN SCALING UP ELECTROLYSERS
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