Controllable growth of two dimensional stereoscopic PtTe₂ nanosheets for efficient electrocatalytic hydrogen...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Two-dimensional (2D) platinum telluride (PtTe2) is a promising electrocatalyst for the hydrogen evolution reaction (HER).
• Conventional synthesis methods limit active sites to edges and are not suitable for large-scale production.
• PtTe2's catalytic activity is hindered by limited active sites on planar insulating substrates.

Purpose of the Study:

• To develop a scalable synthesis method for stereoscopic PtTe2 nanosheets on conductive substrates.
• To investigate the effect of PtTe2 nanosheet thickness on HER catalytic activity.
• To enhance the efficiency of electrocatalysts for water splitting applications.

Main Methods:

• Facile chemical vapor deposition (CVD) for large-area uniform growth of stereoscopic PtTe2 nanosheets.
• Utilized highly conductive carbon cloth as a 3D template substrate.
• Tuned PtTe2 nanosheet thicknesses from approximately 3.0 nm to bulk state.

Main Results:

• Achieved large-area uniform growth of stereoscopic PtTe2 nanosheets on carbon cloth.
• Demonstrated that stereoscopic structure facilitates efficient electron transport.
• Observed significantly improved catalytic activity with increasing nanosheet thickness (3.0 nm to 7.5 nm).
• Attained an ultra-low overpotential of ~38.8 mV at 10 mA cm-2 and a Tafel slope of ~59.2 mV dec-1.

Conclusions:

• Stereoscopic PtTe2 nanosheets on carbon cloth offer abundant active sites and enhanced HER performance.
• Nanosheet thickness is a critical factor influencing the catalytic activity of 2D layered materials.
• This work provides a pathway for designing and synthesizing efficient 2D catalysts on 3D templates for water splitting.