Triclinic boron nanosheets high-efficient electrocatalysts for water splitting

Area of Science:

• Materials Science
• Nanotechnology
• Electrochemistry

Background:

• Two-dimensional (2D) boron nanosheets possess predicted exceptional physical and chemical properties.
• Potential applications include advanced electronics, optoelectronics, and energy storage/conversion.
• Experimental application of 2D boron nanosheets in hydrogen evolution reaction (HER) has not been reported.

Purpose of the Study:

• To experimentally investigate the application of 2D boron nanosheets in HER.
• To synthesize and characterize ultrathin boron nanosheets for catalytic applications.
• To evaluate the HER performance and stability of the synthesized boron nanosheets.

Main Methods:

• Synthesis of ultrathin boron nanosheets on tungsten foils using chemical vapor deposition (CVD).
• Characterization of the crystalline structure and morphology of the boron nanosheets.
• Electrochemical testing for hydrogen evolution reaction (HER) performance, including Tafel slope analysis and long-term stability tests.
• First-principle calculations to understand the underlying mechanisms of performance enhancement.

Main Results:

• Successfully grown highly crystalline, triclinic boron nanosheets matching theoretical predictions.
• Demonstrated excellent HER performance with a low Tafel slope of 64 mV dec⁻¹.
• Exhibited good stability during long-term cycling in an acidic solution.
• First-principle calculations confirmed metal properties and numerous active sites contributing to improved performance.

Conclusions:

• Ultrathin boron nanosheets are promising electrocatalysts for HER.
• The observed high performance is attributed to the inherent metallic nature and abundant active sites.
• This work opens new avenues for utilizing 2D boron materials in catalysis and energy conversion devices.