aaand it boils water again
It’s pretty neat though. It stays liquid the whole time. So you could circulate it to charge it up, somewhere other than where you want to extract the energy. But it looks like it charges from 300nm light (UV) so depending on its absorption bandwidth usefulness is questionable.
there is a problem that it can heat itself up so hard during decomposition that it can just go on without catalyst
I’m all for new technology and approaches, and it looks like this is just at the beginning for this approach so I would assume it could grow in efficiency in the future.
However, as it stands today its pretty far away from a good replacement for existing solutions or approaches.
The new material, called a pyrimidone, can store more than 1.6 megajoules per kilogram. That is almost double the energy density of a conventional lithium-ion battery, which is about 0.9 MJ/kg.
1.6 MJ/kg…that’s…not very dense for a thermal solution for this new material. This is especially true with the likely increase complexity of adding a plumbing system and heat exchanger to extract the energy. With the lithium battery its a pair of wires going in and the same wires coming out to move the stored energy. Further, the lithium battery energy is electrical which certainly can be converted to thermal energy at 100% efficiency with a simple coil of wire (resistor), but it can also be used electrically for all the fun things we use electrical energy for. The new technology solution looks to only be a thermal storage medium.
For reference 1 kg of gasoline has 45 MJ/kg. Keep in mind I’m not saying gasoline is a replacement, I just wanted to offer a scale for reference. Another approach suggested for storing sun energy in chemical form is ammonia which has about 19 MJ/kg. Yet another approach for storing solar thermal energy is sand batteries. A sand battery has a density of .4 to .8 MJ/kg ( 500 °C to 1000 °C respectively). Sand batteries would come with the same burden of a plumbing system and heat exchanger though but without any exotic materials.
None of this is to discourage the basic reseach these folks are doing. They could be onto the “next big thing”, but I just wanted to put it in perspective as to where it is today.
Seems like an old concept with new materials. Ive heard of gardeners leaving barrels of water in their greenhouse to help keep the localized temp above freezing overnight. Clearly those don’t have nearly enough potential to boil water but yeah.
Solar water heaters definitely have the capacity to boil water, if they are made right (use a high temp transfer fluid, vacuum-insulated tubes, proper solar condensers, etc). It’d be difficult to get them to do it on a small scale without a heat pump of some sort in the mix, but even inefficient solar water heater setups need to be installed with a regular water heater after them mostly to down-regulate the temp as they get far far far too hot for practical use directly.
The greenhouse barrels are just for passive radiant heating, but if you use enough of them in the proper places, and insulate well, you can use them to make a passively-heated greenhouse that doesn’t freeze at all, even up in the frigid northern climates (Canada, midwest US, Siberia, etc.)
Drake landing did this 20 years ago with water, salt, sand.
Quite an interesting development and here’s hoping this makes it to production.
Another nail in the coffin of “An Analysis of Water-Based Assumptions and Recalibration of Expectations for Evolutionary Models”
Abstract from Science:
Storing sunlight in a compact and rechargeable form remains a central challenge for solar energy utilization. Molecular solar thermal (MOST) energy storage systems, which harness photon energy and release it as heat on demand, provide a direct approach, but have long failed to meet practical benchmarks. Inspired by the architecture of DNA, we report a pyrimidone-based MOST system that stores energy in the strained Dewar photoisomer upon excitation at 300 nm. Designed with sustainability in mind, the system operates solvent-free and remains compatible with aqueous environments while overcoming one of the field’s greatest hurdles: the controlled extraction and transfer of stored heat. When catalyzed by acid, the Dewar isomer releases enough heat to boil water (~0.5 mL). These advances help point the way toward decentralized solar heat storage and off-grid energy solutions.
