Methods for preparing lead dioxide in a suitably stable form were studied since commercial samples gave erratic emf results no matter how they were treated before use.

• 既然那些被买来的PbO2样品,不论在使用前被多么好地处理过,它们给出的电动势仍然不稳定, 因此制备具有适当稳定形式的PbO2的方法就被研究。