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The reduction of p-nitroaniline (PNA) by electrocatalytic hydrogenation (ECH) as well as the evolution and adsorption of hydrogen were found to be depressed by the formation of irreducible β-Ni(OH) 2 or NiO at nickel-deposited graphite (Ni/C) electrodes. An increase in the Tafel slope from 120 to 200mV dec -1 in the low overpotential region of the hydrogen evolution reaction (HER)...
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