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Issue 35, 2019
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Cation-tunable flower-like (NixFe1−x)2P@graphitized carbon films as ultra-stable electrocatalysts for overall water splitting in alkaline media

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Abstract

Electrocatalytic water splitting is a promising strategy for green and renewable energy development by transforming electrical energy into hydrogen energy. Herein, we report a series of flower-like electrocatalysts with cation-tunable (NixFe1−x)2P nanoparticles encapsulated by porous graphitized carbon films (GCs) via the combination of morphology control and component adjustment. By progressively tailoring the atomic ratios of Ni/Fe, the electronic structure and electrocatalytic activities of (NixFe1−x)2P can be intriguingly modified to achieve versatile catalytic behavior for both the HER and the OER. DFT calculations also validate that the (NixFe1−x)2P with an optimal atomic ratio of Ni/Fe can support the |ΔGH*| to be close to the optimum and decrease the adsorption energy for water, which can boost the water splitting. Meanwhile, anchoring the adjustable (NixFe1−x)2P nanoparticles into GC interlayers can endow these composites with more available active sites, excellent conductivity and enhanced stability. In fact, the combined synergistic effect of cation-tuned (NixFe1−x)2P nanoparticles and porous conductive GCs is the reason that these composites exhibit enhanced electrocatalytic activities, as illustrated by a low overpotential of 206 mV at j = 10 mA cm−2 (256 mV at j = 50 mA cm−2) for the OER. Meanwhile, the bifunctional (Ni0.75Fe0.25)2P@GCs, as both the cathode and anode of an electrolyzer, effectuates an ultra-small cell potential of 1.541 V at j = 10 mA cm−2 (1.573 V at j = 20 mA cm−2) for 30 h during electrolysis of water, rivaling commercial IrO2 and Pt/C catalysts. More importantly, this work can provide a way of fabricating cost-saving, component-tunable and high-efficiency bimetallic electrocatalysts for water splitting.

Graphical abstract: Cation-tunable flower-like (NixFe1−x)2P@graphitized carbon films as ultra-stable electrocatalysts for overall water splitting in alkaline media

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Publication details

The article was received on 17 Jul 2019, accepted on 13 Aug 2019 and first published on 13 Aug 2019


Article type: Paper
DOI: 10.1039/C9TA07762F
J. Mater. Chem. A, 2019,7, 20357-20368

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    Cation-tunable flower-like (NixFe1−x)2P@graphitized carbon films as ultra-stable electrocatalysts for overall water splitting in alkaline media

    H. Zhao, Y. Wang, L. Fang, W. Fu, X. Yang, S. You, P. Luo, H. Zhang and Y. Wang, J. Mater. Chem. A, 2019, 7, 20357
    DOI: 10.1039/C9TA07762F

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