application to be a reviewer Can anybody post a template letter on how to ask a science journal to serve as a reviewer. Here's what I have..
I would like to serve as a peer reviewer for manuscripts submitted to your esteemed journal, XXX. My areas of expertise are XYZ. I have published n articles in this field and have reviewed manuscripts pertaining to these subjects before.
My CV is enclosed for your perusal
The best way I've discovered to become a reviewer for a journal is to submit a paper there. In my experience this is almost always followed a few days later by a request to review a relevant article.

Edited to add: I did my first reviews while a graduate student because my PhD supervisor was the editor of a journal. He would send me things occasionally because he considered it part of my training. So, another way to become a reviewer is to know an editor.