Industry-applicable, efficient hydrogen evolution reaction through an interface-activated bimetallic electrode with seawater photolysis in alkaline media
2020
Hydrogen
evolution reaction (HER) electrocatalysts over platinum (Pt) in an alkaline
medium is crucial for hydrogen economy. Herein, we demonstrate new concept “interface-active
electrode” to transform naturally inert alkaline HER materials towards
industry-applicable HER electrocatalyst, comprised of interface-rich NiP2-FeP2
on Cu nanowires that required overpotential as low as 23.6 and 357 mV at -10 and
-1000 mA/cm2, respectively, with exceptional stability at the industrial
current density of -1 A cm-2, superior to commercial Pt under
alkaline solution. Structural characterization and theoretical calculations
revealed the abundant interface between facets of NiP2-FeP2 on
Cu exhibits optimum H adsorption-free energy than Pt and lower kinetic barrier
for water dissociation (ΔGB = 0.16 eV), boosting alkaline HER.
Additionally, when integrated in a water splitting device, generated 10 mA/cm2
at only 1.42, 1.4, and 1.31 V under 1 M KOH, artificial seawater at
25 C and 100 C, respectively, along with high solar-to-hydrogen (STH)
conversion efficiency of 19.85 %.
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