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Standard Electrode Potentials03:02

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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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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.
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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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Heterogeneous Catalysis01:22

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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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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
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Catalysis

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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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A Highly Active and Robust Copper-Based Electrocatalyst toward Hydrogen Evolution Reaction with Low Overpotential in

Jialei Du1, Jianying Wang1, Lvlv Ji1

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ACS Applied Materials & Interfaces
|October 18, 2016
PubMed
Summary

A novel copper-based nanoparticle film acts as a highly active electrocatalyst for the hydrogen evolution reaction (HER) in neutral water. This earth-abundant material operates at low overpotentials with excellent stability.

Keywords:
Cu-based nanoparticle filmelectrodepositionheterogeneous electrocatalysishydrogen evolution reactionneutral pH

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Copper-based materials are typically inefficient catalysts for the hydrogen evolution reaction (HER), often requiring overpotentials exceeding 300 mV.
  • Developing effective and stable HER electrocatalysts, especially from earth-abundant elements, is crucial for sustainable energy technologies.

Purpose of the Study:

  • To develop a highly active and robust copper-based electrocatalyst for the hydrogen evolution reaction (HER) in neutral conditions.
  • To investigate the catalytic mechanism and performance of an in situ formed Cu(0)-based nanoparticle film.

Main Methods:

  • Electrodeposition of a Cu(0)-based nanoparticle film from a Cu(II) oxime complex.
  • Electrochemical characterization of the nanoparticle film for HER activity and durability in neutral phosphate buffer solution.
  • Mechanistic studies involving incorporated oxime ligands and phosphate anions.

Main Results:

  • The as-prepared nanoparticle film exhibits poor crystallization, incorporating oxime ligands and phosphate anions (PO4^3-).
  • The catalyst demonstrates a low onset overpotential of 65 mV and achieves a current density of 1 mA/cm^2 at an overpotential of 120 mV.
  • The electrocatalyst shows excellent durability, with current density increasing slightly during electrolysis, attributed to anion incorporation.

Conclusions:

  • A Cu(0)-based nanoparticle film formed in situ from earth-abundant materials is a highly active and stable HER electrocatalyst in neutral water.
  • Incorporated phosphate anions (PO4^3-) play a critical role in activating the catalyst and mediating proton transport.
  • This discovery offers a promising pathway for developing efficient and cost-effective electrocatalysts for hydrogen production.