Читать книгу Heterogeneous Catalysts - Группа авторов - Страница 61

Electrically conductive supports such as carbon are amenable to the deposition of metal nanoparticles by electrodeposition. This method allows the use of bulk metal, which is electrochemically stripped and subsequently electrochemically or electroless deposited on the carbon. It is a waste‐free method, comparing advantageously to other methods using metal precursors based on salts such as nitrates. A ligand is used, but this is recycled upon metal deposition. Generally, smaller particles are prepared by decreasing the concentration of the metal solution, the deposition time, or pH. The method must be optimized to prepare small particles of typically 7–20 nm [50]. Since the effects of loading and particle size are coupled, there is a trade‐off between achieving higher metal loadings and having smaller particle sizes.