Chemistry, nanostructure and magnetic properties of Co–Ru–B–O nanoalloys
作者： G. M. Arzac , T. C. Rojas , L. C. Gontard , L. E. Chinchilla , E. Otal
DOI: 10.1039/C4RA05700G
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摘要: In our previous works, Co–B–O and Co–Ru–B–O ultrafine powders with variable Ru content (xRu) were studied as catalysts for hydrogen generation through sodium borohydride hydrolysis. These materials have shown a complex nanostructure in which small Co–Ru metallic nanoparticles are embedded an amorphous matrix formed by based phases B2O3. Catalytic activity was correlated to nanostructure, surface bulk composition. However, some questions related these remain unanswered this work. Aspects such as: 3D morphology, metal nanoparticle size, chemical electronic information on the nanoscale (composition oxidation states), study of formation or not CoxRu1−x alloy solid solution investigated discussed using XAS (X-ray Absorption Spectroscopy) Scanning Transmission Electron Microscopy (STEM) techniques. Also magnetic behavior series is first time structure–performance relationships discussed. All Co-containing samples exhibited ferromagnetic up room temperature while Ru–B–O sample diamagnetic. For xRu = 0.13 sample, enhancement Hc (coercitive field) Ms (saturation magnetization) produced respect monometallic material. However effect observed higher content. The presence CoxB-rich (cobalt boride) matrix, very (Co CoxRu(1−x)) antiferromagnetic CoO phase (for 0.7), explain series.
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