Several users voted to close this question, Pressure-dependence of electrolysis voltage, in which the OP asked for help identifying the flaw in an electrochemical perpetual motion machine.
I gather the reason was summarized by Mithoron's comment:
I'm voting to close this question as off-topic because it's rather physics then chemistry.
This makes no sense to me. Thermodynamics is a central part of physical chemistry, and questions about perpetual motion machines (of the form: 'I know thermodynamics says this is impossible, but I can't find the flaw') have played an important role in learning and understanding thermodynamics. Further, since this specific question concerned an electrochemical, rather than mechanical, perpetual motion machine, it seems more appropriate for chemistry.se than physics.se.
I'll add one of my chemical thermodynamics students came up with an osmotic-pressure-based perpetual motion machine, and couldn't find the flaw, so he asked me to explain why it was impossible. I needed to spend a couple of hours on my own thinking about it before I was able to provide him an answer. By the thinking of the users who voted to close the above question, however, my student's question would be deemed off-topic for my course. Yet neither I, nor any of my colleagues who also teach this course, would agree with that view.