4 ms·
The main issue is the overall efficiency of the process. Creating hydrogen by electrolysis is about 80% and then a fuel cell electric efficiency is 60-70%. So
by greatpatton 7y ago
The main issue is the overall efficiency of the process. Creating hydrogen by electrolysis is about 80% and then a fuel cell electric efficiency is 60-70%. So overall the whole process is not very good.
- chrisco255 7y agoHow's the energy storage density on Hydrogen though? One of the main problems with Lithium is it's heavy and requires a lot of space to store energy.
- greatpatton 7y agoI think that you can get good energy density with Hydrogen which will allow long train journey, but this will degrade further the overall efficiency as high compression of the gas is needed, and this energy is likely lost during usage.
- deleted 7y ago[deleted]
- calaphos 7y agoExtremely good for weight and extremely poor for volume. To reduce the gasses volume storage is usually either highly compressed (200-700bar) or cryogenic (30K), like in the space shuttles tank. In both cases the volumetric density is still quite poor, cryogenic is about 70g/l, which is actually less than the weight of hydrogen chemically bound in a liter of gasoline. There exists some concepts of storing hydrogen chemically bound, e.g. to hydrocarbons or metal hydrites which release the gas on high temperatures (100-200°C).
- Confiks 7y agoFormic acid might be a possible solution for the volumetric capacity problem, although it is still very much in its infancy. See [1]. [1] https://news.ycombinator.com/item?id=22449894 https://news.ycombinator.com/item?id=22449894
- cheerlessbog 7y agoHow is better than methanol?
- natmaka 7y agoOther parameters: a renewable energy source produces without any combustible, risk, or pollution/waste. Even 48% of a no-string-attached gift is a gift.