For short-term storage at a nuclear plant, you could use molten salt thermal storage. In terms of a 'battery,' decomposing ammonia to H2+N2 is one way to direct

For short-term storage at a nuclear plant, you could use molten salt thermal storage. In terms of a 'battery,' decomposing ammonia to H2+N2 is one way to directly convert heat to chemical stored energy: https://eeme.anu.edu.au/research/research-projects/ammonia-based-energy-storage https://eeme.anu.edu.au/research/research-projects/ammonia-b... There are other more complex processes like the sulfur-iodine cycle that was investigated for producing hydrogen from nuclear heat: https://en.wikipedia.org/wiki/Sulfur%E2%80%93iodine_cycle https://en.wikipedia.org/wiki/Sulfur%E2%80%93iodine_cycle As far as I can tell, these processes are probably less economical than generating electricity & then doing electrolysis.