Pd₂₀Te₇ Nanowires as an Efficient Multifunctional Catalyst for CO₂ and O₂ Electroreduction

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Developing multifunctional electrocatalysts for selective small molecule reduction (e.g., CO2 and O2) is crucial.
• Existing Palladium (Pd)-based nanomaterials typically exhibit limited functionality, catalyzing only one type of reaction.
• There is a need for advanced catalysts that can efficiently perform multiple electrochemical transformations.

Purpose of the Study:

• To construct and investigate Pd20Te7 intermetallic nanowires (Pd20Te7 NWs) as a novel multifunctional electrocatalyst.
• To evaluate the performance of Pd20Te7 NWs for both carbon dioxide reduction reaction (CO2RR) and oxygen reduction reaction (ORR).
• To understand how the unique structure and electronic properties of Pd20Te7 NWs influence catalytic activity and selectivity.

Main Methods:

• Synthesis of Pd20Te7 intermetallic nanowires.
• Electrochemical characterization of CO2RR and ORR performance, including Faraday efficiency and selectivity measurements.
• Analysis of electronic structure and surface morphology to correlate with catalytic behavior.

Main Results:

• Pd20Te7 NWs demonstrated high CO selectivity (96.2% Faraday efficiency) for CO2RR at -0.8 V vs RHE.
• Pd20Te7 NWs exhibited over 90% selectivity for H2O2 production in ORR.
• The H2O2 production rate reached 1624.2 mmol gPd−1 h−1 at 0.2 V vs RHE, significantly exceeding that of Pd NWs.

Conclusions:

• Pd20Te7 NWs serve as an efficient and multifunctional electrocatalyst for both CO2RR and ORR.
• The optimized electronic structure and surface morphology of Pd20Te7 NWs enhance catalytic performance by modulating intermediate adsorption and reaction pathways.
• This study underscores the importance of tailoring catalyst electronic and surface properties for advanced electrocatalytic applications.