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ELECTROLYSIS OF WATER...

The most abundant source of hydrogen on earth is water-every molecule of water contain one oxygen atom and two hydrogen atoms. It's relatively simple to separate the hydrogen in water from the oxygen using electricity to run an electrolyser. An electrolyser is a galvanic cell composed of an electrode and a cathode submerged in a water-based electrolyte.
In many ways, the operation of an electrolyser is the opposte of operation a hydrogen fuel cell. In a fuel cell, hydrogen and oxygen are supplied to the anode and the cathode, and they combine to form water while creating an electrical current that can be put to use (see Section1.2.1. and Appendix A). In an electrolyser, an electrical currrent is applied between the anode and the cathode, which causes the water in the electrolyse to break down, releasing oxygen gas at the anode and hydrogen gas at the cathode.

ON BOARD ELECTROLYSERS, Hydrocharger are used with hydrogen injection system for diesel engine. In this case a small amount of hydrogene an oxygene are produced to supplement, not replace, the diesel fuel used in the engine's alternator or 12/24-VDC electrical system.

PROPERTIES ODF HYDROGEN
Hydrogen is the most abundant element in our universe. In addition to being a component of all living things hydrogen and oxygen together make up water, which cover 70 percent of the earth. In its pure form, hydrogene molecule is composed of two hydrogen atoms (H2) and is gas at normal temperatures and pressures: ti is the highest gas (even lighter than heliun) with only 7 percent of the density of air.

...Guidelines for use of hydrogen fuel in commercial vehicules
Final report