Research Article

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2017, 10(9): 2988–2997

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https://doi.org/10.1007/s12274-017-1509-3

Topotactic reduction of layered double hydroxides for atomically thick two-dimensional non-noble-metal alloy

Pengsong Li1, Qixian Xie1, Lirong Zheng4, Guang Feng1, Yingjie Li1, Zhao Cai1, Yongmin Bi1, Yaping Li1, Yun Kuang1 (*), Xiaoming Sun1,2,3 (*), and Xue Duan1

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1 State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
2 College of Energy, Beijing University of Chemical Technology, Beijing 100029, China
3 Beijing Advanced Innovation Centre for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
4 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

Keywords: atomic thickness, two-dimensional (2D) nanosheets, non-noble-metal alloy, atomic dispersion, catalysis
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ABSTRACT Layered double hydroxides (LDHs) have been widely used as catalysts owing to their tunable structure and atomic dispersion of high-valence metal ions; however, limited tunability of electronic structure and valence states have hindered further improvement in their catalytic performance. Herein, we reduced ultrathin LDH precursors in situ and topotactically converted them to atomically thick (~2 nm) two-dimensional (2D) multi-metallic, single crystalline alloy nanosheets with highly tunable metallic compositions. The as-obtained alloy nanosheets not only maintained the vertically aligned ultrathin 2D structure, but also inherited the atomic dispersion of the minor metallic compositions of the LDH precursors, even though the atomic percentage was higher than 20%, which is far beyond the reported percentages for single-atom dispersions (usually less than 0.1%). Besides, surface engineering of the alloy nanosheets can finely tune the surface electronic structure for catalytic applications. Such in situ topotactic conversion strategy has introduced a novel approach for atomically dispersed alloy nanostructures and reinforced the synthetic methodology for ultrathin 2D metal-based catalysts.
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Topotactic reduction of layered double hydroxides for atomically thick two-dimensional non-noble-metal alloy. Nano Res. 2017, 10(9): 2988–2997 https://doi.org/10.1007/s12274-017-1509-3

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