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Processes at Electrodes01:30

Processes at Electrodes

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The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Crystal Field Theory - Octahedral Complexes02:58

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Electrochemical Cells01:28

Electrochemical Cells

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Electrochemical cells are systems that convert chemical energy into electrical energy or use electrical energy to drive chemical reactions. They consist of two electrodes in contact with an electrolyte, where redox reactions enable electron transfer. Most electrochemical cells include two half-cells connected by an external wire for electron flow and a salt bridge for ion flow. The salt bridge contains an electrolyte solution and maintains charge neutrality by allowing ions—not...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Interatomic Spacing-Dependent Electrocatalytic CO2 Reduction: Inert Te Heteroatom Modulation in Hexagonal Pd

Ya-Lin Song1, Yu-Feng Tang1, Mulin Yu1

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Angewandte Chemie (International Ed. in English)
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Precise control over metallic interatomic spacing in palladium-tellurium nanoplates enables highly efficient electrochemical CO2 reduction (ECR) to CO. This breakthrough optimizes catalyst performance and stability for carbon capture technologies.

Keywords:
CO poisoningPd‐Te nanoplateelectrocatalysiselectrochemical CO2 reductioninteratomic spacingphase control

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Metallic interatomic spacing is a critical factor in electrocatalysis.
  • Precisely controlling interatomic spacing and understanding its structure-activity relationship remain significant challenges.

Purpose of the Study:

  • To develop a phase-controlled strategy for continuous interatomic spacing modulation in palladium-tellurium nanoplates.
  • To investigate the effect of precisely tuned interatomic spacing on electrochemical CO2 reduction (ECR) activity.

Main Methods:

  • Synthesis of hexagonal palladium-tellurium (Pd-Te) nanoplates with various intermetallic phases.
  • Modulation of adjacent palladium-palladium distances (dPd-a-Pd) from 2.75 to 4.07 Å.
  • Electrochemical CO2 reduction (ECR) experiments.
  • In situ spectroscopy and theoretical calculations.

Main Results:

  • Achieved continuous interatomic spacing modulation in Pd-Te nanoplates, realizing precise tuning of dPd-a-Pd.
  • Demonstrated a volcano-shaped dependence of ECR activity on dPd-a-Pd, with Pd20Te7 NPs (dPd-a-Pd = 2.88 Å) achieving 99.9% CO Faraday efficiency (FECO).
  • Pd20Te7 NPs maintained over 90% FECO at ~120 mA cm−2 during long-term stability tests.
  • Confirmed that interatomic spacing, rather than electronic effects, dominated ECR activity.
  • Identified optimal *CO adsorption configuration and balanced *COOH adsorption/*CO desorption on Pd20Te7 NPs.

Conclusions:

  • Interatomic spacing is a pivotal parameter in regulating intermediate adsorption configurations for electrocatalysis.
  • The developed phase-controlled strategy offers a pathway for designing highly active and stable electrocatalysts.
  • Optimized interatomic spacing in Pd20Te7 nanoplates leads to exceptional ECR activity and anti-poisoning capacity.