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Template-free fabrication of fractal porous Y2O3 monolithic foam and its functional modification by Ni-doping

无模板法合成分形孔结构Y2O3泡沫单块及其镍掺杂功能化

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摘要

自相似的分形结构如云、 树、 雪花、 闪电、 人类循环系统等广泛存在于自然界中, 然而自然界中自发形成的分形结构很难用常规的实验室合成方法得到. 本文利用一种无模板的、 基于金 属-小分子配位聚合作用的自组装方法, 制备了具有分形孔结构的整体钇-氨基酸配合物材料, 并通过焙烧得到分形孔结构Y2O3. 材料的孔尺度分布范围从微米到纳米尺度, 最为有趣的是, 这种孔结构表现出自相似特征的结构, 即任意一级的大孔的孔壁都是由次级尺度范围的二级小孔孔结构组成. 整体配合物由几十微米的微米孔构筑而成, 微米孔的孔壁由尺度更小的次级微米孔组成, 次级微米孔的孔壁继续由100 nm左右的纳米孔组成. 继续放大后可以看到纳米孔的孔壁包含由纳米晶粒堆积而成的更小的介孔(2–10 nm). 通过在合成中引入其他金属阳离子(Ni2+, Bi3+, Ce3+, Eu3+), 可以得到分形孔包裹镶嵌的掺杂型分形孔混合氧化物. 以Ni2+为例, 分散的NiO纳米颗粒嵌入Y2O3泡沫分形孔结构中. 在乙醇水蒸气重整制氢反应中, 与常规的负载型Ni催化剂相比, 被分形孔Y2O3封装的Ni催化剂表现出更优的低温催化活性.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (21773128, 21534005 and 21421001). Chen R acknowledges the support from China Scholarship Council. The work carried out at Brookhaven National Laboratory was supported by the US Department of Energy (DE-SC0012704). Sanjaya D. Senanayake is supported by a US Department of Energy Early Career Award. This research used resources of the Advanced Photon Source (Beamlines 17BM (XRD)) at Argonne National Laboratory, which is a DOE Office of Science User Facility (DE-AC02-06CH11357).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Key Laboratory of Advanced Energy Materials Chemistry (MOE), Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin, 300350, China

    Rui Chen  (陈睿) & Tiehong Chen  (陈铁红)

  2. X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, 60439, USA

    Wenqian Xu  (许文骞)

  3. Chemistry Division, Brookhaven National Laboratory, Upton, New York, 11973, USA

    Sanjaya D. Senanayake, José A. Rodriguez & Jingguang G. Chen  (陈经广)

Authors
  1. Rui Chen  (陈睿)
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  2. Wenqian Xu  (许文骞)
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  3. Sanjaya D. Senanayake
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  4. José A. Rodriguez
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  5. Jingguang G. Chen  (陈经广)
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  6. Tiehong Chen  (陈铁红)
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Contributions

Author contributions Chen R and Xu W performed the experiments; Chen R, Xu W, Senanayake S, Rodriguez J, Chen J and Chen T contributed to data analysis and manuscript writing.

Corresponding authors

Correspondence to José A. Rodriguez or Tiehong Chen  (陈铁红).

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Conflict of interest The authors declare that they have no conflict of interest.

Additional information

Rui Chen received her PhD degree in materials physics and chemistry in 2014 from Nankai University. Currently, she is a research assistant at the School of Materials Science and Engineering, Nankai University. Her research interest focuses on the fabrication of porous metal oxides for applications in thermal- and photocatalytic reactions.

Tiehong Chen received his BSc and PhD degrees from Nankai University in 1990 and 1996, respectively. He joined Nankai University in 1996 and is currently a professor at the School of Materials Science and Engineering. His current research interests include the synthesis of zeolites and mesoporous materials, heterogeneous catalysis and electrocatalysis.

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Chen, R., Xu, W., Senanayake, S.D. et al. Template-free fabrication of fractal porous Y2O3 monolithic foam and its functional modification by Ni-doping. Sci. China Mater. 63, 1842–1847 (2020). https://doi.org/10.1007/s40843-020-1317-1

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  • DOI: https://doi.org/10.1007/s40843-020-1317-1

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