Hydrogen fuel storage for automobiles

The reaction between hydrogen and a rare earth alloy generates heat, and hydrogen desorption occurs with absorption of heat. On this basis, an air-conditioning system has been developed. A chemical heat pump has been developed by Nihon Steel using 800 kg of MM-Ni-Ca-Al alloy with a capacity of 150000 kcal/h. This was used as an air conditioner for a room. Such a device has been installed in a house containing a spa which is operated 

Field Companies, Institute Work capacity Operation Alloys 

Chemical heat pump Kubota Toyobo 3000 kcal/h 1983 LaNi 45 kg 

A metal hydride battery similar to the nickel-cadmium battery has been developed by Sharp corporation. The battery is shaped in the form of a button of 20 mm diameter and can give 1.2 V. The anode in the battery is made of La-Ni-Sn alloy hydride, and the cathode is nickel oxide. Potassium hydroxide solution in polyamide-resin is the electrolyte. The battery exhibits high energy density (i.e.) 1.5 to 2.0 times that of the Ni-Cd battery, good cycling life and superior low temperature behaviours. 

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