Improved Oxidation Stability of Carbon-coated Ni Nanoparticles Synthesized by One-step Electrical Wire Explosion

Strategic Insights -

Scientists at the Korea Atomic Energy Research Institute have made a groundbreaking discovery in the field of nanotechnology. By developing a rapid one-step method to synthesize high-purity carbon-coated Ni (Ni@C) nanoparticles, researchers have achieved improved oxidation stability, making them more suitable for various applications. The thermal oxidation of Ni@C nanoparticles is closely related to the burn-off of protective carbon shells, and the activation energy for oxidation has been determined to be significantly higher than that of passivated Ni (Ni@P) nanoparticles.

Key Takeaways:

  • Researchers developed a one-step method to synthesize high-purity carbon-coated Ni (Ni@C) nanoparticles via electrical wire explosion in methane gas.
  • The Ni@C nanoparticles have smaller average particle size and narrower particle size distribution than the passivated Ni (Ni@P) nanoparticles.
  • The activation energy for oxidation of Ni@C nanoparticles is 161.31-170.34 kJ mol(-1), significantly higher than that of Ni@P nanoparticles (81.22 kJ mol(-1)).
  • The carbon shell effectively prevents the active core Ni nanoparticles from high-temperature oxidation in air.
  • Korean Nuclear RD program, National Research Foundation of Korea - Korean government (MSIT), and Korea Atomic Energy Research Institute (KAERI) RD program supported this research.
  • Gyoung-Ja Lee, Jun-Hyeok Lee, and Byung-Hoon Kim are the authors of this research.

Statistics:

  • 161.31-170.34 kJ mol(-1): activation energy for oxidation of Ni@C nanoparticles
  • 81.22 kJ mol(-1): activation energy for oxidation of Ni@P nanoparticles
  • 1 step: rapid synthesis method developed
  • High-purity carbon-coated Ni (Ni@C): nanoparticles synthesized via electrical wire explosion
  • Smaller average particle size and narrower particle size distribution: characteristics of Ni@C nanoparticles compared to Ni@P nanoparticles

Sources:

  • NewsRx. Investigators from Korea Atomic Energy Research Institute Release New Data on Nanoparticles (Improved Oxidation Stability of Carbon-coated Ni Nanoparticles Synthesized By One-step Electrical Wire Explosion). Nanotechnology Weekly. January 17, 2022; p 529.
  • Materials Chemistry and Physics. Improved Oxidation Stability of Carbon-coated Ni Nanoparticles Synthesized By One-step Electrical Wire Explosion. 2022;276.
  • Elsevier Science Sa. Materials Chemistry and Physics. www.journals.elsevier.com/materials-chemistry-and-physics/.