Since all compounds are electrically neutral, there also must be a species in the oxidation-reduction reactions that gains electrons.
因为所有的化合物都是电中性的，因此在氧化还原反应中某种物质一定获得了电子。
2
The grapheme modified by a macrocyclic compound is used as the catalyst and is used for catalyzing the oxygen reduction of batteries under acidic, neutral and alkaline conditions.