Supercritical methanol synthesis and antioxidizability of ultrafine cobalt powder

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Abstract
Ultrafine cobalt powders are indispensable for high-end applications (cemented carbides, magnetic alloys, and new energy batteries) because of their unique properties; however, conventional methods have high costs, energy consumption, coarse sizes, agglomeration, and complex processes. This study used a one-step supercritical methanol hydrothermal method to synthesize ultrafine Co powder, investigating key parameters (reducing/chelating agents, concentrations, pH) and characterizing via SEM, XRD, FT-IR, XPS, TG/DTG. Under optimal conditions (glycerol 2 mol/L, PVP 0.2 mol/L, pH=10.82, precursor 0.05 mol/L), fcc/hcp Co powders with min average size 522±117 nm were obtained. PVP inhibited agglomeration via C=O-Co coordination, the powders had excellent antioxidation resistance (~300°C onset, stable up to 600°C).This study proposes an efficient and energy-saving method.
Funding Information
  • Jiangxi Province major science & technology Research & development project (Grant No. 20223AAG01009)

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