Release time:2023-10-19  Hits:

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• Abstract:Rational design of highly efficient, robust, and low-cost trifunctional electrocatalysts for oxygen reduction reaction (ORR), hydrazine oxidation reaction (HzOR), and hydrogen evolution reaction (HER) is extremely urgent for seawater-based renewable energy conversion and storage, including direct hydrazine fuel cells (DHzFC) and overall hydrazine splitting (OHzS). Herein, FeP/FeNi2P encapsulated in N, P co-doped hierarchical carbon (FeNiP-NPHC) in situ grown on nickel foam is fabricated via a hydrothermal-pyrolysis-phosphidation procedure. Benefiting from the strong coupling effect among FeP, FeNi2P, and N, P co-doped carbon at the three-phase heterojunction interface, as well as the unique 1D/3D hierarchical structure, the as-prepared FeNiP-NPHC shows superior ORR (E-1/2 = 0.83 V), HzOR (E-100 = 7 mV), and HER (E-100 = -180 mV) performance in alkaline seawater. Density functional theory functions indicate that constructing three-phase heterojunction interface of FeNiP-NPHC can effectively adjust the d-band center and electronic structure, which is conductive to balance and optimize the trifunctional electrocatalytic performance. As proof of concept, the self-assembled DHzFC is utilized to power the OHzS in alkaline seawater successfully, verifying application potential of the FeNiP-NPHC as trifunctional electrocatalyst.
• Volume:32
• Issue:46
• Translation or Not:no