TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Apparatus: The apparatus further comprises a control system (15) operatively coupled to the hydrogen liberating tool, and configured for controlling operation; and a controllable power source (144) coupled to the control system (15). The control system (15) includes a pressure sensor (152) arranged in the pre-volume chamber (12) and configured for producing a pressure sensor signal representative of the hydrogen gas pressure in the pre-volume chamber (12); a temperature sensor (151) arranged in the vicinity of the micro-cylinder ends (115) sealed with plugs, the temperature sensor (151) is configured for measuring a temperature in the vicinity of the micro-cylinder ends (115), and producing a temperature sensor signal indicative of the temperature; where the control system (15) is operatively coupled to the pressure sensor (152) and to the temperature sensor (151), and being responsive to at least one signal selected from the pressure sensor signal and the temperature sensor signal, and being capable of generating control signals for controlling the operation of the controllable power source (144). Ends (114) of the micro-cylinders (112) distal to the pre-volume chamber (12) are permanently sealed. The external diameter of the micro-cylinders (112) is in the range of 1 micrometer to 400 micrometers. A number of the micro-cylinders (112) in one array is in the range of 50 to 500. The micro-cylinders are made of a material that meets the following condition sigma / rho greater than or equal to 1700 MPa cm3/g, where sigma is the tensile strength and rho is the mass density. The easily meltable alloy of the plugs is at least one alloy selected from Sn16?b32?i52, SnBi58, and SnIn52. A pressure of the hydrogen stored within the micro-cylinders (112) is in the range of 1000-2000 atm. Pressure of the hydrogen within the pre-volume chamber (12) is in the range of 5-20 atm. The micro-cylinders (112) have tapering portions in the form of a cone at the ends (115) sealed with a plug (113), thus to prevent the pushing of the plugs out from the ends by the highly pressurized hydrogen gas stored in the cavities of the micro-cylinders. Heating coils (141) are coupled to the controllable power source (144) through a connecting line including a female connector (142) which extends from the storage tank (11) into the pre-volume chamber (12) where it meets with a male connector (132) extending from the adapter module (13). The storage tank (11) comprises a housing (111) for enveloping the arrays of the micro-cylinders (112). The device utilizing the hydrogen gas stored in the storage tank (11) is a hydrogen fuel cell (131).