As the lightest element in the universe, hydrogen dissipates very rapidly if it escapes from a storage vessel. Hydrogen storage systems can be very safe, provided that good design and safety practices have been followed. In general, you don’t want to ship hydrogen a long distance (> 100 miles) as a gas, as it is much more cost effective to ship it as either a cryogenic liquid or other liquid carrier. There are also chemicals such as liquid organic hydrogen carriers and ammonia, that can act as molecular hydrogen carriers for long distance transportation. In these cases, the hydrogen is bonded to a solid material and can be liberated upon demand. Additional methods of storing hydrogen include metal hydride materials, as well as various chemical hydrides. However, it can also be stored as a cryogenic liquid at very low temperatures. Hydrogen is most commonly stored as a compressed gas. How is hydrogen stored? Are there different ways to store hydrogen? Is storing hydrogen safe? For example, in markets where fuel cell vehicles are available, selling the hydrogen as a transportation fuel may be the highest value end-use. While it is feasible to simply make hydrogen and then convert it back to electricity (like a battery), that is not always the most valuable use for the hydrogen. That is, they want to convert the hydrogen back to electricity, so that you are creating a “power-to-gas-to-power” (P2G2P) device. Once the hydrogen is stored, there are different “use cases” for the hydrogen, but often people think of energy storage like a battery. Also known as “power-to-gas” or P2G, the process involves using electrical energy to split water, and then capturing and storing the product hydrogen. Most commonly, when people talk about HES, they are referring to the conversion of electrical energy to hydrogen via the process of electrolysis. In its simplest terms, it is storing energy in the form of hydrogen. In this interview, Steve Szymanski from Nel Hyrdogen talks to AZoM about Hydrogen Energy Storage (HES) and the applications it can be used for. Insights from industry Steve Szymanski Nel Hydrogen
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