The difference in reversible potential between oxygen reduction reaction and hydrogen evolution reaction of any pH in an aqueous electrolyte is . . . . . . . . volt. [Given, standard reduction potentials for hydrogen evolution reaction, $$\frac{{{E^ \circ }2{H^ + }}}{{{H_2}}} = OV,SHE$$ and oxygen reduction reaction : $$\frac{{{E^ \circ }{O_2}}}{{4OH}} = 0.4V,SHE.$$ Also PH 2 = PO 2 = 1 atm]

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