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Alloyed Palladium-Lead Nanosheet Assemblies for Electrocatalytic Ethanol Oxidation
Jing Sun1, Xianzhuo Lao1, Min Yang1
1Institute of Materials for Energy and Environment, State Key Laboratory of Bio-Fibers and Eco-Textiles, College of Materials Science and Engineering, Qingdao University, Qingdao, Shandong 266071, People's Republic of China.
Langmuir : the ACS Journal of Surfaces and Colloids
|December 15, 2021
Summary
Researchers developed novel alloyed palladium-lead (Pd3Pb/Pd) nanosheet assemblies (NSAs) for enhanced electrocatalysis. These 3D nanostructures significantly boost ethanol oxidation activity, showing great promise for energy applications.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Three-dimensional (3D) alloyed bimetallic electrocatalysts are crucial for advanced electrocatalysis.
- Developing novel nanostructured materials with tunable compositions is essential for improving catalytic efficiency.
Purpose of the Study:
- To synthesize and characterize novel alloyed palladium-lead (Pd3Pb/Pd) nanosheet assemblies (NSAs).
- To investigate the electrocatalytic activity of these Pd3Pb/Pd NSAs for ethanol oxidation.
- To understand the role of lead (Pb) doping in enhancing the catalytic performance.
Main Methods:
- Low-temperature oil bath synthesis for creating 2D nanosheet structures.
- Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) for morphological analysis.
- Powder X-ray Diffraction (XRD) for structural and alloying confirmation.
- Electrochemical analysis and Density Functional Theory (DFT) for activity evaluation.
Main Results:
- Successfully synthesized Pd3Pb/Pd NSAs with controllable morphology and composition.
- Confirmed homogeneous alloying of Pd and Pb within the NSAs via XRD.
- Demonstrated significantly enhanced electrocatalytic activity for ethanol oxidation, reaching 2886 mA mg-1 for Pd3Pb/Pd-15 NSA, a 2.8-fold increase over pure Pd NSA.
- Identified improved stability and performance under harsh conditions (high temperature, high KOH, and high ethanol concentrations).
Conclusions:
- Alloyed Pd3Pb/Pd NSAs exhibit superior electrocatalytic performance for ethanol oxidation compared to pure Pd.
- Pb doping and the resulting electronic structure modification are key to enhanced activity.
- The synthesized NSAs show potential for practical applications in demanding electrochemical environments.
