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Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...
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Elevated Water Oxidation by Cation Leaching Enabled Tunable Surface Reconstruction.

Songzhu Luo1, Chencheng Dai1, Yike Ye1,2

  • 1School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.

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Summary
This summary is machine-generated.

This study demonstrates Cr substitution in NiFeₓCr₂₋ₓO₄ catalysts enhances oxygen evolution reaction (OER) performance through surface reconstruction. The optimized catalyst shows significantly improved current density for sustainable hydrogen production.

Keywords:
NiFe-based materialsmembrane electrode assemblyoxygen evolution reactionsurface reconstructionwater oxidation

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Water electrolysis is key for energy storage, but oxygen evolution reaction (OER) kinetics are slow.
  • Surface reconstruction is an emerging strategy to improve OER catalyst efficiency.
  • Developing high-performance OER catalysts is crucial for sustainable hydrogen generation.

Purpose of the Study:

  • To investigate Cr substitution for inducing surface reconstruction in NiFeₓCr₂₋ₓO₄.
  • To evaluate the impact of this reconstruction on OER performance.
  • To explore the potential of these catalysts for practical hydrogen production.

Main Methods:

  • Synthesis of NiFeₓCr₂₋ₓO₄ catalysts.
  • Cyclic voltammetry (CV) conditioning to induce surface reconstruction via Cr leaching.
  • Electrochemical characterization to assess OER activity and durability.
  • Analysis of turnover frequency (TOF).
  • Testing in a membrane electrode assembly (MEA) cell.

Main Results:

  • Cr substitution induced surface reconstruction, forming an active amorphous layer.
  • The best-performing NiFe₀.₂₅Cr₁.₇₅O₄ showed a ~1500% current density promotion at η=300 mV.
  • OER activity was primarily determined by the Ni:Fe ratio.
  • High activity and durability were confirmed in MEA testing.

Conclusions:

  • Controlled surface reconstruction via Cr substitution is an effective strategy to boost OER performance in NiFeₓCr₂₋ₓO₄.
  • These catalysts demonstrate significant potential for large-scale, sustainable hydrogen gas generation.
  • Further analysis of TOF and limitations is provided.