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What metals are safe to use as electrodes when doing electrolysis of water (I am trying to produce hydrogen gas)

Magnesium sulfate is not the best choice when carrying out an electrolysis. Because, near the cathode, the solution becomes basic, and magnesium hydroxide $\ce{Mg(OH)2}$ will be produced, and it is ...
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Would laying an atom thick piezoelectric material near a heat source generate current?

tldr: not quite, but there are a lot of interesting applications You're correct that a piezoelectric material interconverts mechanical energy into electrical energy. Importantly, there's both: direct ...
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