Reduction is the gain of electrons by a substance. It is also the loss of oxygen from a substance. For example, copper(II) oxide can be reduced to form copper when it reacts with hydrogen: ...

Hydrogen is becoming an increasingly ... Initially, the fabricated copper (Cu) NWs have low crystallinity and form a Cu oxide layer on the surface, hindering interaction with oxygen.

This produces both hydrogen for ethylene synthesis and oxygen, which the gallium nitride absorbs to form gallium nitride oxide. Copper captures hydrogen and carbon atoms from carbon dioxide ...