Post History

We haven't really addressed what SE would call "requests for external resources" here. I think it's quite clear that we aren't taking shopping recommendations, as in "where do I buy this part". Asking where to find books is similar, so I'd that say such questions are off-topic.

I think it would be helpful however, if we could assemble a book recommendation thread with a list of books that experts (and not just students) have actually read and can recommend. It would have to be books about electronics/physics and applications (EMC, PCB layout, microcontroller programming etc). 

Chemistry and creating fuel cells is borderline off-topic. I think that theory about chemical reactions etc is off-topic, but how to use a fuel cell in an electronic circuit would be on-topic. Questions about EX certification and intrinsic safety of electronics is also on-topic and you'll no doubt end up there in case of making a fuel cell for use in actual products.