He put it in his hand because he needed to bring together Adam and Lilith to bring about the Third Impact (Or at least this is my understanding).
Spoilers ahead, highlight to read.
He accomplishes this by attaching it to his hand, shoving his hand inside (Yes, inside) Rei's breast, and then letting her fuse with Lilith (Though somehow I don't think he was planning on having his hand amputated in the process).
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