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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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FeHf Binary Hydroxide/Oxide Nanostructures as Catalysts for Oxygen Evolution.

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Pulsed electrodeposition (PED) enables controlled synthesis of iron-hafnium binary hydroxide/oxide (FeHf-BH) nanocomposites. Optimized FeHf-BH materials show promising oxygen evolution reaction (OER) activity for catalysis.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Developing efficient electrocatalysts is crucial for energy conversion technologies.
  • Metal hydroxides/oxides are promising candidates for oxygen evolution reactions (OER).
  • Controlled synthesis of multimetallic nanocomposites is challenging.

Purpose of the Study:

  • To present pulsed electrodeposition (PED) for synthesizing FeHf-BH nanocomposites.
  • To demonstrate controlled variation of Fe and Hf content in the deposited materials.
  • To investigate the OER activity of FeHf-BH nanocomposites.

Main Methods:

  • Pulsed electrodeposition (PED) from aqueous nitrate baths.
  • Characterization using SEM, EDS, XRD, Raman, and XPS.
  • Electrochemical analysis of oxygen evolution reaction (OER) in alkaline media.

Main Results:

  • Controlled Fe (5.9-49.9 at.%) and Hf (2.4-58.7 at.%) content achieved.
  • Deposited materials are agglomerated nanoparticles (50-150 nm).
  • Optimized FeHf-BH (11.9 at.% Hf) shows excellent OER activity (1.63 V onset, 47 mV/dec Tafel slope).

Conclusions:

  • PED is a scalable method for designing FeHf-BH nanocomposites.
  • FeHf-BH materials exhibit high OER performance.
  • This approach can be extended to other multimetallic hydroxide/oxide systems.