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Self-Anti-Stacking 2D Metal Phosphide Loop-Sheet Heterostructures by Edge-Topological Regulation for Highly Efficient Water Oxidation
- Source :
- Small (Weinheim an der Bergstrasse, Germany). 17(7)
- Publication Year :
- 2020
-
Abstract
- 2D metal phosphide loop-sheet heterostructures are controllably synthesized by edge-topological regulation, where Ni2 P nanosheets are edge-confined by the N-doped carbon loop, containing ultrafine NiFeP nanocrystals (denoted as NiFeP@NC/Ni2 P). This loop-sheet feature with lifted-edges prevents the stacking of nanosheets and induces accessible open channels for catalytic site exposure and gas bubble release. Importantly, these NiFeP@NC/Ni2 P hybrids exhibit a remarkable oxygen evolution activity with an overpotential of 223 mV at 20 mA cm-2 and a Tafel slope of 46.1 mV dec-1 , constituting the record-high performance among reported metal phosphide electrocatalysts. The NiFeP@NC/Ni2 P hybrids are also employed as both anode and cathode to achieve an alkaline electrolyzer for overall water splitting, delivering a current density of 10 mA cm-2 with a voltage of 1.57 V, comparable to that of the commercial Pt/C||RuO2 couple (1.56 V). Moreover, a photovoltaic-electrolysis coupling system can as well be effectively established for robust overall water splitting. Evidently, this ingenious protocol would expand the toolbox for designing efficient 2D nanomaterials for practical applications.
- Subjects :
- Tafel equation
Materials science
Phosphide
Alkaline water electrolysis
Stacking
02 engineering and technology
General Chemistry
Overpotential
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Cathode
0104 chemical sciences
Anode
law.invention
Biomaterials
chemistry.chemical_compound
chemistry
Chemical engineering
law
Water splitting
General Materials Science
0210 nano-technology
Biotechnology
Subjects
Details
- ISSN :
- 16136829
- Volume :
- 17
- Issue :
- 7
- Database :
- OpenAIRE
- Journal :
- Small (Weinheim an der Bergstrasse, Germany)
- Accession number :
- edsair.doi.dedup.....6a83cf2876d64277c34ca86030f9f645