Abstract
Renewable (electrical) energy from sources like photovoltaics and windmills, which are inherently intermittent, requires significant storage of the energy. Hydrogen(H2) from electrochemical water splitting offers a nearly unlimited renewable resource for energy storage and bulk chemical processing. Platinum(Pt), although scarce, remains the archetypical electrocatalyst for acidic H2 evolution. While several non-noble metal catalysts have been found, they all, except one, perform worse than Pt. Since 2013, many transition metal phosphides have been reported as possible replacements for Pt. Our group reported that one particular nickel phosphide phase, Ni5P4, is comparable to Pt in activity (geometrically) as well as corrosion resistant in both strong acid and alkali during electrocatalysis. Here, we will present comparative studies of the activity, efficiency and corrosion stability of five crystalline NixPy phases during electrocatalytic H2 evolution. Supported by Rutgers, NATCO and NSF-CBET/DOE. Figure 1
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