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Oxygen
Oxygen is necessary to breathe, and extra oxygen can also be used to burn material for heat energy, or can be used as an important component in various chemical reactions.
A person breathes 7 or 8 liters of air per minute. Air is about 20% oxygen. But when you exhale, your breath is about 15% oxygen, so you consumed about 5%. Therefore, a person uses about 550 liters of pure oxygen each day.
http://health.howstuffworks.com/human-body/systems/respiratory/question98.htm
Oxygen toxicity is a condition resulting from the harmful effects of breathing molecular oxygen (O 2) at increased partial pressures.
(In a mixture of gases, each gas has a partial pressure which is the hypothetical pressure of that gas if it alone occupied the entire volume of the original mixture at the same temperature.[1] The total pressure of an ideal gas mixture is the sum of the partial pressures of each individual gas in the mixture.)
Central nervous system oxygen toxicity manifests as symptoms such as visual changes (especially tunnel vision), ringing in the ears (tinnitus), nausea, twitching (especially of the face), behavioural changes (irritability, anxiety, confusion), and dizziness. This may be followed by a tonic–clonic seizure consisting of two phases: intense muscle contraction occurs for several seconds (tonic phase); followed by rapid spasms of alternate muscle relaxation and contraction producing convulsive jerking (clonic phase). The seizure ends with a period of unconsciousness
The astronauts in the Gemini and Apollo programs breathed 100 percent oxygen at reduced pressure for up to two weeks with no problems.
Symptoms: Nausea, vomiting, dizziness, headache, rapid breathing and heart rate, and flushing can occur with carbon dioxide poisoning. Severe cases of carbon dioxide toxicity progress to confusion, convulsions, and loss of consciousness.
Electrolysis of water is the decomposition of water (H2O) into oxygen (O2) and hydrogen gas (H2) due to an electric current being passed through the water.