About Hydrogen & Bromine

Nothing goes in or out… except electricity!Elestor--About-Hydrogen-1

Since the chemical reaction of Elestor’s storage systems is 100% reversible, degradation of the process does fundamentally not occur. The chemicals as used in the storage systems do not degrade and are not in any way ‘consumed’ during charge or discharge. Consequently, once a storage system has been installed and the individual reservoirs have been filled up with the chemicals H2 and Br2, there is no need to access these reservoirs anymore.

The chemicals remain literally forever in their reservoirs without any further need for human intervention. This inherently rules out any form of risk, related to human error if not handled properly.

Elestor’s storage systems are 100% self-contained, and nothing goes in our out… except electricity!


About Hydrogen

Hydrogen (H2) is the lightest element on the periodic table and is the most abundant chemical substance in the universe. In 1766, Henry Cavendish was the first to recognize that hydrogen produces water when burned, a property which later gave it its name: in Greek, hydrogen means “water-former”.

The main concern in working with hydrogen is flammability, and hydrogen in fact has the widest explosive/ignition mix range with air of all gases, except acetylene. However, this is mitigated by the fact that hydrogen, due to its low weight, rapidly rises and disperses before ignition.

Unless the escape is in an enclosed, unventilated area, hydrogen is very unlikely to induce serious risks.

Elestor’s storage systems incorporate a number of parallel and independent safety systems to ensure safe use of hydrogen:

  • All storage systems are equipped with forced ventilation to make sure that any present hydrogen can escape and disperse easily.
  • The presence of hydrogen is continuously monitored by special sensors, which can close the hydrogen reservoir instantly, even at very low concentrations.
  • The pressure in the hydrogen reservoir is continuously monitored to immediately detect any leakage, after which the system can be shut down instantly.
  • The hydrogen loop and cell stack are physically isolated from all electronic circuits.


About Bromine

Bromine, from ancient Greek, meaning “stench”, is a chemical element with symbol Br, and atomic number 35. It is a halogen.

Free bromine does not occur in nature, but occurs as colorless soluble crystalline salts, analogous to table salt. The high solubility of bromide ions has caused its accumulation in the oceans, where it is abundantly available. Commercially, the element is easily extracted from brine pools, mostly in the United States, Israel and China.

Elemental bromine is a red-brown liquid at room temperature, corrosive and toxic, with properties between those of chlorine and iodine. One of the major uses of bromine is as a water purifier/disinfectant in swimming pools and hot tubs. Another key use of bromine compounds is in the manufacturing of pharmaceuticals: Brominated substances are important ingredients of many over-the-counter and prescription drugs, including analgesics, sedatives, and antihistamines.

Elestor’s storage systems incorporate a number of parallel and independent safety systems to ensure safe use of bromine:

  • The use of, especially for this application, designed double-walled reservoirs, providing maximum protection in case of mechanical shock.
  • The use of a chemical neutralizing agent, filling the space between the double walls of the bromine reservoir.
  • Application of a so-called Bromine Complexing Agent (BCA) in the bromine solution, to prevent the bromine from fuming, in the unlikely case that bromine would come in direct contact with open air.

To further ensure proper use and safe handling, Elestor has entered a close cooperation with the world’s largest supplier of bromine, ICL Industrial Products, who prepared below movie about the unique advantages of using Bromine for electricity storage