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Herein, we have developed an effective strategy to immobilize spinel cobalt oxide (Co3O4) particles of nanometer and subnanometer sizes on carbon sphere support via impregnation and deposition-precipitation methods. With carbon spheres support, very small Co3O4 nanoparticles of around 1–2nm are uniformly distributed on the surface. Based on XPS analysis, the surface cobalt species are found coordinated...
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