Abstract
The Co3O4 nanosheet-built hollow dodecahedrons (Co3O4 NSHDs) were fabricated via a controllable twostep self-templated method. The ZIF-67 dodecahedrons were prepared as first self-template to synthesize the Co-LDH hollow dodecahedrons, which were further used as self-template to fabricate Co3O4 NSHDs by a controlled calcination. The proposed two-step self-templated method not only brings hollow structures without auxiliary template, ultrathin nanosheet, ultrafine grains, and large surface areas, but also allows the easy and uniform surface modification, as demonstrated of PdO modification. The Co3O4 NSHDs with above features could show multifunctional applications, such as sensing and catalysis. Experiments suggest that the Co3O4 NSHDs show good gas sensing performances to trimethylamine at a low operating temperature (100°C). They can be further enhanced by PdO surface modification, which have a low detection limit (250 ppb) and a short response time (4.5 s). In addition, the Co3O4 NSHDs exhibited excellent oxygen evolution reaction performances with a low overpotential of 359 mV, low Tafel slope of 80.7 mV dec−1 and low electrochemical impedance, which was superior to those for the Co3O4 NCs obtained by directly calcinating the ZIF-67 templates, Ni foam and most common metal oxides catalysts.
摘要
Co3O4纳米片基中空十二面体可以通过一种可控的自模板法制备而成. 首先利用ZIF-67为自模板合成Co-LDH中空十二面体, 然后 将其作为自模板通过优化退火的方式制备Co3O4纳米片组成的中空十二面体(Co3O4 NSHDs). 利用该两步自模板法制得的Co3O4 NSHDs 不仅具有中空结构、超薄的纳米片、超细的纳米颗粒, 还易实现表面的均匀修饰(如PdO的均匀修饰). 拥有上述特点的Co3O4 NSHDs可以 实现多方面的应用, 例如气敏和催化. 实验结果表明Co3O4 NSHDs对三甲胺气体在低工作温度(100°C)下表现出很好的敏感特性. 在PdO表 面修饰后, 对三甲胺的气敏性能进一步增强, 如更低的检测下限(250 ppb)和快速的气敏响应(4.5 s). 另外, 该材料也表现出优异的析氧反应 活性. 和直接利用ZIF-67退火制得的Co3O4纳米笼、泡沫镍和大多数金属氧化物催化剂相比, 它具有较低的过电势(359 mV)、小的阻抗和 小的塔菲尔斜率(80.7 mV dec−1).
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Acknowledgements
The authors acknowledge the financial support from the National Key R&D Program of China (2016YFC0201103), the Natural Science Foundation of China (51471161 and 11674320), and Youth Innovation Promotion Association CAS and Key Research Projects of the Frontier Science CAS (QYZDB-SSW-JSC017).
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Yuanyuan Li received her BSc degree from Hefei University of Technology in 2015. She is currently pursing Master’s degree in the University of Science and Technology of China. Her research is focused on the fabrication of nanomaterials and their gas sensing performances.
Guotao Duan received his BSc degree in Material Sciences from Heifei University of Technology in 2002. In 2007, he obtained a PhD in Materials Science from the Institute of Solid State Physics at the Chinese Academy of Sciences. He was a visiting scholar at the National Institute for Materials Science in Japan. Since 2007, he has been a professor at the Institute of Solid State Physics at the Chinese Academy of Sciences. His research interests include gas sensors based on the semiconductor micro/nanostructured array, detection devices, and the surface enhanced Raman spectrum of the noble metal micro/nanostructured array for environmental applications.
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Li, Y., Liu, B., Wang, H. et al. Co3O4 nanosheet-built hollow dodecahedrons via a two-step self-templated method and their multifunctional applications. Sci. China Mater. 61, 1575–1586 (2018). https://doi.org/10.1007/s40843-018-9254-6
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DOI: https://doi.org/10.1007/s40843-018-9254-6