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首页> 外文期刊>Nanotechnology >Novel photocatalyst gold nanoparticles with dumbbell-like structure and their superiorly photocatalytic performance for ammonia borane hydrolysis
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Novel photocatalyst gold nanoparticles with dumbbell-like structure and their superiorly photocatalytic performance for ammonia borane hydrolysis

机译：具有哑铃结构的新型光催化剂金纳米粒子及其优于氨硼烷水解的光催化性能

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摘要

Gold nanoparticles (Au NPs) have attracted remarkable research interest in heterogeneous catalysis due to their unique physical and chemical properties. However, only small-sized Au NPs (7 nm) exhibit promising catalytic activity. In this work, dumbbell-like Au NPs (D-Au NPs) with an average size of 37 x 11 nm were prepared by a secondary seed-mediated growth method to serve as novel photocatalysts for ammonia borane (AB) hydrolysis in a solution with a specific pH value. Our results demonstrate that (i) the strengthened localized surface plasmon resonance (LSPR) compensation effect could effectively remedy the loss of catalytic activity resulting from the size enlarging of D-Au NPs, proved by the observation that the heating power of a single Au nanoparticle (Ps) and turnover frequency of AB molecules within 10 min of D-Au NPs are 52.5 and 3.89 times higher, respectively, than those of spherical Au NPs; (ii) the extinction coefficient and Ps of D-Au NPs are almost 2.72 and 2.42 times as high, respectively, as those of rod-like Au NPs, demonstrating the promoting structure-property relationship of the dumbbell-like structure; (iii) when the pH value of the AB solution was lower than 6.0, the hydrolysis rate was highly promoted, indicating that H+ ions play an active role in the hydrolysis process. This work greatly extends the application of noble metals and provides a new insight into AB hydrolysis.
机译：由于其独特的物理和化学性质，金纳米粒子（Au NPS）引起了异质催化的显着研究兴趣。然而，只有小尺寸的Au nps（＆7nm）表现出有希望的催化活性。在这项工作中，通过二次种子介导的生长方法制备平均尺寸为37×11nm的哑铃Au nps（D-Au nps），以用作溶液中的氨硼烷（Ab）水解的新型光催化剂特定的pH值。我们的结果表明，（i）增强的局部表面等离子体共振（LSPR）补偿效果可以有效地弥补由D-Au NP的大小扩大的催化活性的损失，从而证明了单个Au纳米粒子的加热功率的观察（PS）和AB分子在10分钟内的AB分子的周转频率分别比球形AU NPS分别为52.5％和3.89倍; （ii）D-Au NPS的消光系数和Ps分别为高2.72和2.42倍，作为棒状Au NPS，展示了哑铃状结构的促进结构性质关系; （iii）当AB溶液的pH值低于6.0时，高度促进水解速率，表明H +离子在水解过程中发挥活性作用。这项工作极大地扩展了贵金属的应用，并为AB水解提供了新的洞察力。

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  • 来源
    《Nanotechnology》 |2018年第16期|共9页
  • 作者

    Zhu Mingyun; Dai Yunqian; Fu Wanlin; Wu Yanan; Zou Xixi; You Tengye; Sun Yueming;

  • 作者单位

    Southeast Univ Sch Chem &

    Chem Engn Nanjing 211189 Jiangsu Peoples R China;

    Southeast Univ Sch Chem &

    Chem Engn Nanjing 211189 Jiangsu Peoples R China;

    Southeast Univ Sch Chem &

    Chem Engn Nanjing 211189 Jiangsu Peoples R China;

    Southeast Univ Sch Chem &

    Chem Engn Nanjing 211189 Jiangsu Peoples R China;

    Southeast Univ Sch Chem &

    Chem Engn Nanjing 211189 Jiangsu Peoples R China;

    Southeast Univ Sch Chem &

    Chem Engn Nanjing 211189 Jiangsu Peoples R China;

    Southeast Univ Sch Chem &

    Chem Engn Nanjing 211189 Jiangsu Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    Au nanoparticles; LSPR; photothermal effect; ammonia borane;

    机译：Au纳米粒子;LSPR;光热效果;氨硼烷;

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