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Single‐Crystalline Ultrathin Nickel Nanosheets Array from In Situ Topotactic Reduction for Active and Stable Electrocatalysis
Author(s) -
Kuang Yun,
Feng Guang,
Li Pengsong,
Bi Yongmin,
Li Yaping,
Sun Xiaoming
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201509616
Subject(s) - nanosheet , electrocatalyst , materials science , nickel , prussian blue , nanotechnology , platinum , chemical engineering , nanocrystal , lamellar structure , hydrazine (antidepressant) , catalysis , electrochemistry , electrode , chemistry , metallurgy , engineering , biochemistry , chromatography
Simultaneously synthesizing and structuring atomically thick or ultrathin 2D non‐precious metal nanocrystal may offer a new class of materials to replace the state‐of‐art noble‐metal electrocatalysts; however, the synthetic strategy is the bottleneck which should be urgently solved. Here we report the synthesis of an ultrathin nickel nanosheet array (Ni‐NSA) through in situ topotactic reduction from Ni(OH) 2 array precursors. The Ni nanosheets showed a single‐crystalline lamellar structure with only ten atomic layers in thickness and an exposed (111) facet. Combined with a superaerophobic (low bubble adhesive) arrayed structure the Ni‐NSAs exhibited a dramatic enhancement on both activity and stability towards the hydrazine‐oxidation reaction (HzOR) relative to platinum. Furthermore, the partial oxidization of Ni‐NSAs in ambient atmosphere resulted in effective water‐splitting electrocatalysts for the hydrogen‐evolution reaction (HER).