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Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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Properties of Transition Metals02:58

Properties of Transition Metals

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Molybdenum Doping Augments Platinum-Copper Oxygen Reduction Electrocatalyst.

Yun Luo1, Björn Kirchhoff2, Donato Fantauzzi3,4

  • 1IC2MP, UMR-CNRS 7285, University of Poitiers, 14 rue Michel Brunet, 86022, Poitiers, France.

Chemsuschem
|November 8, 2017
PubMed
Summary

We developed cost-effective, highly active, and stable carbon-supported molybdenum-doped platinum-copper (Mo-PtCu/C) nanoparticles for the oxygen reduction reaction (ORR). These catalysts show significantly enhanced kinetics and durability, addressing key challenges in energy research.

Keywords:
alloysdensity functional theorydopingmolybdenumnanoparticles

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing efficient and affordable catalysts for the oxygen reduction reaction (ORR) is crucial for advancing energy technologies.
  • Platinum-based catalysts are effective but costly, necessitating strategies for cost reduction and performance enhancement.

Purpose of the Study:

  • To synthesize and characterize novel, stable, and highly active carbon-supported molybdenum-doped platinum-copper (Mo-PtCu/C) nanoparticles.
  • To evaluate the catalytic activity and stability of Mo-PtCu/C for the ORR compared to conventional catalysts.
  • To investigate the role of molybdenum doping in enhancing catalyst performance and stability using theoretical calculations.

Main Methods:

  • Facile one-pot synthesis of carbon-supported Mo-doped PtCu nanoparticles (NPs) using readily available precursors.
  • Electrochemical characterization including half-cell kinetics measurements and electrochemical-accelerated stability tests.
  • Proof-of-concept experiments using a H2/O2 microlaminar fuel cell.
  • Density Functional Theory (DFT) studies to elucidate the mechanism of Mo doping on catalytic activity and stability.

Main Results:

  • Mo-PtCu/C NPs exhibited two-to-fourfold higher ORR half-cell kinetics compared to PtCu/C and Pt/C.
  • Enhanced catalytic activity was confirmed in a H2/O2 microlaminar fuel cell.
  • Mo-PtCu/C demonstrated significantly improved stability with reduced dealloying compared to binary alloys.
  • DFT calculations indicated that Mo doping enhances oxidative resistance and optimizes surface oxygen adsorption energetics.

Conclusions:

  • Molybdenum doping is an effective strategy to enhance both the activity and stability of Pt-based ORR catalysts.
  • Mo-PtCu/C presents a promising, cost-effective alternative to traditional platinum catalysts for energy applications.
  • The findings suggest a potential emerging trend of using Mo doping to improve platinum alloy catalyst performance.