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The atomic origin of high catalytic activity of ZnO nanotetrapods for decomposition of ammonium perchlorate

Distinct from the common well faceted ZnO nanorods (R-ZnO), ZnO nanotetrapods (T-ZnO) exhibited a remarkable catalytic activity for the thermal decomposition of ammonium perchlorate (AP): the activation energy at high temperature decomposition (HTD) was significantly decreased to 111.9 kJ mol super(...

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Published in:CrystEngComm 2014-01, Vol.16 (4), p.570-574
Main Authors: Tang, Gen, Wen, Yanwei, Pang, Aiming, Zeng, Dawen, Zhang, Yungang, Tian, Shouqin, Shan, Bin, Xie, Changsheng
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cited_by cdi_FETCH-LOGICAL-c301t-60ac6c613f0d7693f0fd9bb72754bd3c3aaa300c195040659b32a6e84d5305f3
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creator Tang, Gen
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description Distinct from the common well faceted ZnO nanorods (R-ZnO), ZnO nanotetrapods (T-ZnO) exhibited a remarkable catalytic activity for the thermal decomposition of ammonium perchlorate (AP): the activation energy at high temperature decomposition (HTD) was significantly decreased to 111.9 kJ mol super(-1), much lower than 162.5 kJ mol super(-1) for pure AP and 156.9 kJ mol super(-1) for AP with R-ZnO. This was attributed to more abundant atomic steps on the surface of T-ZnO than that of R-ZnO, as evidenced by HRTEM and density function theory (DFT) calculations. It was shown that the initiation step of perchloric acid (PA) decomposition happened much faster on stepped T-ZnO edges, resulting in the formation of active oxygen atoms from HClO sub(4). The formed oxygen atoms would subsequently react with NH sub(3) to produce HNO, N sub(2)O and NO species, thus leading to an obvious decrease in the activation energy of AP decomposition. The proposed catalytic mechanism was further corroborated by the TG-IR spectroscopy results. Our work can provide atomic insights into the catalytic decomposition of AP on ZnO nanostructures.
doi_str_mv 10.1039/C3CE41435C
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title The atomic origin of high catalytic activity of ZnO nanotetrapods for decomposition of ammonium perchlorate
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