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Updated: Feb 24, 2026

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Microbubbles Loaded with Nickel Nanoparticles: A Perspective for Carbon Sequestration.

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Summary

Metallic nickel nanoparticles accelerate carbon dioxide (CO2) dissolution in saline aquifers. Optimal Ni NP concentration enhances CO2 solubility, particularly in acidic, high-salinity conditions relevant for carbon sequestration.

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Area of Science:

  • Geochemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Carbon sequestration in saline aquifers is crucial for mitigating climate change.
  • Understanding CO2 dissolution in brine is key to effective sequestration.
  • Salinity and pH significantly impact CO2 solubility in reservoir conditions.

Purpose of the Study:

  • To investigate the acceleration of gaseous carbon dioxide (CO2) dissolution in aqueous phases using metallic nickel (Ni) nanoparticles (NPs).
  • To evaluate the impact of varying pH and salinity on CO2 bubble dissolution.
  • To determine the optimal Ni NP concentration for enhanced CO2 dissolution under simulated reservoir conditions.

Main Methods:

  • Microfluidic study of CO2 bubble dissolution in aqueous solutions.
  • Systematic variation of pH and salinity to mimic reservoir conditions.
  • Analysis of Ni NP catalytic effects on CO2 dissolution rates at different concentrations.

Main Results:

  • CO2 bubble shrinkage increased with higher basicity; bubble expansion increased with salinity.
  • An optimal Ni NP concentration of 30 mg L-1 significantly enhanced CO2 dissolution.
  • Higher Ni NP concentrations (30-50 mg L-1) reduced catalytic efficiency due to diffusion limitations.
  • Ni NPs were most effective in catalyzing CO2 dissolution in acidic, high-salinity brine.

Conclusions:

  • Metallic Ni NPs show significant potential for accelerating CO2 dissolution in saline aquifers.
  • Ni NPs can effectively mitigate the negative impact of high salinity on CO2 solubility.
  • Optimized Ni NP application could improve the efficiency and feasibility of carbon sequestration strategies.