| 卢强.新型花状Cu2O制备及其可见光分解水产氢性能[J].分子催化,2016,30(6):557-565 |
| 新型花状Cu2O制备及其可见光分解水产氢性能 |
| Synthesis of novel flower-like Cu2O photocatalysts for Hydrogen Evolution under Visible Light |
| 投稿时间：2016-11-02 修订日期：2016-12-12 |
| DOI： |
| 中文关键词: 花状Cu2O 光解水 氢气 尖端催化 |
| 英文关键词:flower-like Cu2O photocatalytic for water splitting hydrogen cutting-edge catalytic effect |
| 基金项目: |
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| 摘要点击次数: 1066 |
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| 中文摘要: |
| 利用简单的液相还原法，制备新型的花状和切角立方状Cu2O光催化材料。通过TEM、XRD、XPS以及UV-Vis等对样品的形貌、晶型结构、表面化学特性以及吸光性能等进行表征。结果发现，不同实验条件下生成前驱体的不同以及Cu2O纳米晶体各晶面{111}、{110}、{100}稳定性差异，对最终晶体的形貌演变起到关键的作用，初步得出粒子的形貌形成过程涉及种子颗粒团聚(seed-aggregation)以及表面重塑(surface-reconstruction) 的生长机制。并对样品进行光解水产氢性能对比研究，结果表明，不同形貌的Cu2O可见光催化活性及稳定性差异很大，花状Cu2O独特的微观“针尖”结构具有“尖端催化”效应，导致氢气产率高达206.5 μmol/h，是切角立方状Cu2O的十倍以上，且循环四次后，产率降低2%左右，表现出极高的稳定性。 |
| 英文摘要: |
| Novel flower-like and cubic Cu2O nanoparticles were successfully synthesized via a facile and cost-effective liquid reduction route through controlling the time intervals of the introduction of the reagent. The obtained samples were characterized by TEM, XRD, XPS, UV-vis and so on. Results show that the differences in stability of the Cu2O {111}、{110} and {100} facets and the formed precursors were the main reasons to the controllable micro-morphology. A possible growth mechanism involving seed-aggregation and surface-restruction was proposed. The prepared flower-like Cu2O particles exhibited a higher photocatalytic activity and stability for photocatalytic H2 generation from water under visible-light illumination than other Cu2O particles. The excellent photocatalytic activity was attributed to their unique micro “needle-point” structure which could lead to “cutting-edge catalytic effect”. Hydrogen production rate from flower-like Cu2O was as high as 206.5μmol/h, which was ten times or more compared with that from corner-cut cubic Cu2O. Moreover, hydrogen production rate reduced only 2% after four cycles, which showed the relatively high stability. |
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