液相还原法制备纳米铂粉研究

采用液相还原法，以硼氢化钾(KBH₄)作为还原剂，聚乙烯吡咯烷酮(PVP)、聚乙二醇(PEG)等作为分散剂，将还原剂、分散剂及其他添加剂混合制成还原液，加入到处理过的氯铂酸(H₂PtCl₆)溶液中制备电子浆料用纳米铂粉。研究了还原过程中氯铂酸浓度、还原液p H值、分散剂种类等对铂粉粒度大小及形貌的影响。采用扫描电子显微镜(SEM)和X射线衍射仪(XRD)对铂粉进行表征。结果表明，通过控制反应条件可制备平均粒径在20～100 nm的高纯纳米铂粉。对上述铂粉制备的铂浆料指标进行分析后表明，其可应用于制备催化铂电极。

Preparation of nano Pt powder prepared by liquid phase reduction method

Nano platinum powder used in electronic paste was prepared through liquid-phase reduction method. The liquid reductant containing KBH4 as reducing agent, polyvinylpyrrolidone (PVP) or polyethylene glycol (PEG) as protective agent and additives was added into processed H2PtCl6 solution. The reduction mechanism together with influence of concentration and pH value on particle size and shape have been studied in this paper. SEM and XRD were used to characterize the prepared powder. Results showed that by controlling reaction conditions pure nano platinum powder with an average particle size of 20~100 nm can be prepared. The index of the platinum paste prepared by the above platinum powder was analyzed, which shows that it can be used to prepare catalytic platinum electrode.