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摘要: 研究了负载铂纳米粒子大孔炭材料的可控制备。淀粉和氯铂酸分别被用作碳源和铂源，采用两种不同的方法将铂注入基于淀粉凝胶的大孔炭。方法A：将淀粉凝胶块材浸入氯铂酸水溶液中，然后用硼氢化钠还原。方法B：在形成淀粉凝胶块材之前将氯铂酸加入前驱体中。研究发现：大孔炭的孔径和壁厚可以通过改变淀粉含量进行调节，产炭率从负载前的24%分别提高到37%（方法A）和44%（方法B），凝胶在炭化过程中的体积膨胀也得到有效抑制。方法A得到的铂纳米粒子（平均粒径为3.5nm，粒径平均偏差为0.9nm）比方法B制备的（平均粒径为5.5nm，粒径平均偏差为1.8nm）粒径更小、粒径分布更窄。
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关键词:
- 炭复合物,大孔炭,炭化,淀粉,铂纳米粒子
Abstract: Abstract: The preparation of macroporous carbon materials containing Pt nanoparticles was investigated. Starch and H2PtCl6 were used as the carbon and Pt source respectively. Two impregnation methods were used to incorporate Pt into the starch gel based macroporous carbon. In the first (A) the starch gel monolith was soaked in H2PtCl6 and reduced by NaBH4. In the second (B) H2PtCl6 was added to the precursors before the starch gel monolith formation. It was found that the size and wall thickness of the macropores of the samples could be controlled by adjusting the starch content, and the carbon yield was increased from 24% to 37% for method A and to 44% for method B. The volume expansion during the carbonization was also suppressed. A smaller particle size and narrow size distribution (average particle diameter is 3.5nm, average particle diameter deviation is 0.9nm) were obtained by method B, compared to method A (average particle diameter is 5.5nm, average particle diameter deviation is 1.8nm). -
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