Acid anion electrolyte effects on platinum for oxygen and hydrogen electrocatalysis.

Platinum is an important material with applications in oxygen and hydrogen electrocatalysis. To better understand how its activity can be modulated through electrolyte effects in the double layer microenvironment, herein we investigate the effects of different acid anions on platinum for the oxygen reduction/evolution reaction (ORR/OER) and hydrogen evolution/oxidation reaction (HER/HOR) in pH 1 electrolytes. Experimentally, we see the ORR activity trend of HClO > HNO > HSO, and the OER activity trend of HClO [Formula: see text] HNO ∼ HSO.