电化学反应在燃料电池中起着关键作用。

___Electrochemical reactions play a key role in fuel cells.

这种电池利用电化学反应来产生电能。

This battery uses ___electrochemical reactions to generate electricity.

这个实验室专门研究电化学电池的性能改进。

This lab specializes in improving the performance of ___electrochemical cells.