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Related Concept Videos

Catalysis02:50

Catalysis

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.
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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...
Sulfur Assimilation01:20

Sulfur Assimilation

Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to become...

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In-Plane Electronic Metal-Support Interaction Enables Efficient Sulfur Catalysis on Ni Single-Atom Catalysts.

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Researchers identified specific nickel-nitrogen-carbon coordination sites that effectively bind sulfur, explaining the high catalytic activity in single nickel catalysts for lithium-sulfur batteries. A low-coordination NiN2 site shows the most promise for catalyzing sulfur reactions.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • Single nickel catalysts (SANi) exhibit high activity in lithium-sulfur batteries (LSBs) due to Ni-S interactions, but the exact active sites remain unclear.
  • Conventional NiN4 sites do not effectively form Ni-S bonds, failing to explain the observed catalytic performance.

Purpose of the Study:

  • To identify the true catalytically active sites in single-atom catalysts (SACs) for LSBs.
  • To understand the role of metal-support interactions and coordination environments in Ni-S bond formation.

Main Methods:

  • Construction and evaluation of various Ni-N-C coordination models.
  • Density functional theory (DFT) calculations to analyze electronic structures and bonding.

Main Results:

  • Specific Ni-N-C configurations enable effective Ni-S bond formation through spin-polarized electron delocalization and electron-relay channels.
  • Seven coordination configurations were found to form effective Ni-S bonds, explaining SANi's catalytic efficiency.
  • A low-coordination NiN2 site was identified as the most active for sulfur redox reactions due to superior anchoring and low reaction barriers.

Conclusions:

  • The study elucidates the fundamental mechanism of Ni-S interactions in SACs for LSBs.
  • Rational design of highly active SACs can be achieved by controlling metal coordination environments.
  • This work provides new insights into optimizing catalysts for advanced battery technologies.