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Fast Gas–Solid Reaction Kinetics of Nanoparticles Unveiled by Millisecond In Situ Electron Diffraction at Ambient Pressure
Author(s) -
Yu Jian,
Yuan Wentao,
Yang Hangsheng,
Xu Qiang,
Wang Yong,
Zhang Ze
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201806541
Subject(s) - kinetics , nucleation , nanoparticle , millisecond , transmission electron microscopy , ambient pressure , materials science , diffusion , diffraction , electron diffraction , chemical kinetics , chemical engineering , ultrafast electron diffraction , chemical physics , chemistry , nanotechnology , thermodynamics , optics , organic chemistry , physics , engineering , quantum mechanics , astronomy
Acquiring the kinetics of gas–nanoparticle fast reactions under ambient pressure is a challenge owing to the lack of appropriate in situ techniques. Now an approach has been developed that integrates time‐resolved in situ electron diffraction and an atmospheric gas cell system in transmission electron microscopy, allowing quantitative structural information to be obtained under ambient pressure with millisecond time resolution. The ultrafast oxidation kinetics of Ni nanoparticles in oxygen was vividly obtained. In contrast to the well‐accepted Wagner and Mott–Cabrera models (diffusion‐dominated), the oxidation of Ni nanoparticles is linear at the initial stage (<0.5 s), and follows the Avrami–Erofeev model ( n =1.12) at the following stage, which indicates the oxidation of Ni nanoparticles is a nucleation and growth dominated process. This study gives new insights into Ni oxidation and paves the way to study the fast reaction kinetics of nanoparticles using ultrafast in situ techniques.