Nickel IV Oxide Bookmark Notes

(nickel iv oxide)

Formula NiO2 Black brown solid Unstable compound Rare natural occurrence Typically synthesized not mined
Preparation Methods Electrochemical oxidation of Ni II salts Thermal decomposition nickel compounds under oxygen High pressure oxygen treatment of NiO
Key Properties Strong oxidizing agent Decomposes readily releasing oxygen Decomposes to Ni2O3 then NiO at moderate heat Insoluble in water Dissolves in acids
Primary Applications Important cathode material rechargeable batteries Especially nickel cadmium NiCd and nickel metal hydride NiMH types Functions as the charged positive electrode NiOOH NiO2 couple Electrocatalyst for oxygen evolution reaction OER in water splitting
Handling Precautions TOXIC Handle with care Avoid inhalation skin contact dust Use appropriate PPE gloves fume hood Reacts with reducing agents May cause fire risk Strong oxidizer store away flammables

(nickel iv oxide)

Stability Note Highly reactive Difficult to store long term Decomposes over time even at room temperature Sensitive to moisture heat
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