Bifunctional tin telluride electrocatalysts for oxygen evolution and reduction reactions

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Electrocatalysis is crucial for energy conversion and storage technologies.
• Developing efficient and stable electrocatalysts for oxygen reactions is a key challenge.
• Tin telluride (SnTe) is an emerging material with potential for catalytic applications.

Purpose of the Study:

• To investigate the electrocatalytic performance of SnTe octahedral microcrystals.
• To evaluate SnTe for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR).
• To assess the activity, overpotentials, and stability of SnTe in different pH conditions.

Main Methods:

• Synthesis of SnTe octahedral microcrystals.
• Electrochemical characterization using techniques like cyclic voltammetry and rotating disk electrode.
• Evaluation of catalytic activity for OER and ORR in alkaline and neutral electrolytes.

Main Results:

• SnTe exhibits remarkable activity for the oxygen evolution reaction (OER).
• Low overpotentials were recorded for OER: 340 mV (alkaline) and 365 mV (neutral).
• Excellent oxygen reduction reaction (ORR) onset potential of 0.83 V in alkaline pH was observed, with high current density and long-term stability.

Conclusions:

• SnTe octahedral microcrystals are highly effective electrocatalysts for both OER and ORR.
• The material demonstrates promising performance for energy conversion applications.
• SnTe offers a potential alternative to noble metal-based electrocatalysts.