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Color in Coordination Complexes
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Spin Density Modulation by Ru Nanoparticles in ZIF-67 Framework for Magnetically Enhanced Water Splitting Reaction.

Swayamprakash Biswal1, Biswajit Mishra1, Bijay P Tripathi1

  • 1Department of Materials Science and Engineering, Indian Institute of Technology Delhi, New Delhi, India.

Small (Weinheim an Der Bergstrasse, Germany)
|January 25, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a magnetically enhanced electrocatalyst (RuNP/ZIF-67) for water splitting. The novel catalyst significantly improves hydrogen and oxygen evolution reactions, demonstrating robust performance for efficient energy conversion.

Keywords:
ZIF‐67 frameworkinterfacial charge transfermagneto‐electrocatalysisoverall water splittingspin‐polarization

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Magnetic interactions can modulate spin states in electrocatalysts, accelerating water-splitting kinetics.
  • Developing efficient electrocatalysts for water splitting is crucial for sustainable energy technologies.

Purpose of the Study:

  • To synthesize and characterize a novel RuNP/ZIF-67 nanocatalyst for magnetically enhanced water splitting.
  • To investigate the synergistic effects of magnetic properties and electronic structure on electrocatalytic activity.

Main Methods:

  • Synthesis of ruthenium nanoparticles immobilized onto zeolitic imidazolate framework-67 (ZIF-67).
  • Electrochemical characterization including hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) measurements under magnetic fields.
  • Rotating disk electrode (RDE) experiments, chronopotentiometry, and pulse-chronoamperometry for performance and stability assessment.
  • In situ operando studies for mechanistic insights.

Main Results:

  • The RuNP/ZIF-67 nanocatalyst facilitated interfacial charge transfer and altered cobalt oxidation states, inducing ferromagnetism.
  • Under a 240 mT magnetic field, HER overpotential decreased from 68 to 51 mV, and OER overpotential decreased from 210 to 182 mV.
  • The overall cell voltage for water splitting was reduced from 1.56 to 1.53 V.
  • Stable magneto-electrochemical performance was confirmed through long-term tests.

Conclusions:

  • RuNP/ZIF-67 acts as a robust bifunctional electrocatalyst with synergistic electronic and magnetic properties.
  • Magnetically enhanced electrocatalysis offers a promising pathway for efficient water splitting.
  • The study establishes a new class of electrocatalysts for advanced energy applications.