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Phosphorous Incorporated PtNi Networks with Synergistic Directional Electron Transfer for Efficient and Durable Seawater Hydrogen Production
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DOI：10.1002/adfm.202418264.png)
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Abstract
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The abundant chloride ions in seawater, which poison and corrode electrode materials, are the main reason for the low performance of Pt-based catalysts toward hydrogen evolution reaction (HER) in seawater. Coupling Pt with oxophilic transition metals can enhance the activity of Pt-based electrocatalysts, but their long-term stability is still unsatisfactory. Herein, a small number of phosphorous atoms (from 1.2 to 5.9 at%) are precisely incorporated into PtNi networks (P-PtNi networks) via a facile aqueous reduction strategy at room temperature. Experimental measurements and theoretical calculations prove that P incorporation leads to a synergistic directional electron transfer from P and Ni to Pt, resulting in improved water dissociation kinetics, enhanced Cl- resistance and facilitated hydrogen adsorption. Consequently, P-PtNi networks exhibit outstanding HER activities with a lower overpotential of 37 mV at 10 mA cm-2 and an 8.5-fold higher mass activity at -0.07 V compared to commercial Pt/C and only slightly lowered potential after 120 h of testing in alkaline simulated seawater. Furthermore, P-PtNi networks show an ultrahigh solar-to-hydrogen efficiency of 15.2% for solar cell-driven hydrogen production from seawater. This work sheds new lights on the design of high-performance Pt-based nanomaterials toward practical applications of seawater hydrogen production.
Keywords:
directional electron transfer
phosphorous incorporation
precise stoichiometry control
Pt-based catalyst
seawater hydrogen evolution
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19
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3.4W
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32.1W
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