研究目的
Investigating the synthesis of iridium nanospheres (Ir NSs) with abundant atomic steps for enhanced catalytic performance in overall water splitting.
研究成果
The laser-produced Ir NSs demonstrated superior OER and HER activities in acidic medium, attributed to their unique surface atomic steps. As a bifunctional catalyst, they achieved a low cell voltage for overall water splitting, showing potential for energy conversion applications.
研究不足
The study focuses on acidic medium, and the scalability of the laser ablation technique for large-scale production may need further investigation.
1：Experimental Design and Method Selection
Pulsed laser ablation in liquid (PLAL) was employed to produce Ir nanospheres (Ir NSs) enriched with surface atomic steps. This method is known for preparation of various metallic nanoparticles, including those for electrocatalysis.
2：Sample Selection and Data Sources
An Ir plate was ablated by a nanosecond pulsed laser in deionized water to form Ir NSs. The as-obtained colloid was mixed with carbon black at a mass ratio Ir/C of 1:4.
3：List of Experimental Equipment and Materials
Nd:YAG laser (Dawa-350, Beamtech), FEI Technai G2 F20 TEM, JEOL ARM-200F HAADF-STEM, Bruker D8 Advance diffractometer, PHI Quantum 2000 XPS spectrometer, DXR Microscope Raman spectrophotometer, CHI660E electrochemical workstation.
4：Experimental Procedures and Operational Workflow
The Ir target was immersed in deionized water and ablated by the pulsed laser for 30 min. The colloid was mixed with carbon black, ultrasonicated, centrifuged, and dried to get the final product.
5：Data Analysis Methods
Electrochemical measurements were performed using a CHI660E electrochemical workstation. The performance was evaluated based on overpotential, Tafel slope, and durability tests.
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HAADF-STEM
JEOL ARM-200F
JEOL
Used for high-angle annular dark-field scanning transmission electron microscopy imaging of the Ir NSs.
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XRD
Bruker D8 Advance
Bruker
Used for X-ray diffraction analysis of the Ir NSs.
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TEM
FEI Technai G2 F20
JEOL
Used for transmission electron microscopy analysis of the Ir NSs.
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Nd:YAG laser
Dawa-350
Beamtech
Used for laser ablation of the Ir target in deionized water to produce Ir nanospheres.
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XPS
PHI Quantum 2000
Physical Electronics Company
Used for X-ray photoelectron spectroscopy analysis of the Ir NSs.
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Raman spectrophotometer
DXR Microscope
Renishaw
Used for Raman spectroscopy analysis of the Ir NSs.
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Electrochemical workstation
CHI660E
Chenhua
Used for testing the HER and OER performance of different catalysts.
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