Issue Date: April 7, 2014
Water-Splitting Catalyst Likes All pH Values
The possibility of splitting water to liberate hydrogen, a clean-burning fuel, has spurred an intense search for catalysts to make that process feasible and energy efficient. Most of the promising inexpensive catalysts mediate only half of the chemistry—either the hydrogen evolution reaction (HER) or the oxygen evolution reaction (OER). Coupling those halves in a single water-splitting system has remained challenging, in part because of each half’s pH preference. HER catalysts prefer acidic media, whereas OER . . .
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