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Featured Research

Mapping of Catalytic Reactions in Real Time

Researchers at Brookhaven National Laboratory have used Hummingbird Scientific in-situ gas cell TEM and X-Ray specimen holders to characterize heterogeneous catalytic reactions. By using correlated gas cell scanning transmission electron microscopy (STEM) and X-ray microscopy and spectroscopy they were able to quantitatively characterize catalytic activity of supported Pt catalysts. The capability of the Hummingbird Scientific gas cell to be transferred between the TEM and X-Ray microscope allowed a variety of probes to characterize a model catalytic reaction. This method can be broadly applied to study  operando gas-reaction studies.

Reference: Y. Li, D. Zakharov, S. Zhao, R. Tappero, U. Jung, A. Elsen, Ph. Baumann, R.G. Nuzzo, E.A. Stach & A.I. Frenkel, “Complex structural dynamics of nanocatalysts revealed in Operando conditions by correlated imaging and spectroscopy probes”. Nature Communications (2015) Abstract



Video Spotlight

Reduction of Co nanoparticles from hollow-core oxide particles

These experiments show the changes in nanoparticle morphology during oxidation and reduction of Co nanoparticles, which are crucial for making sense of the fundamental relationships involved in catalytic activity.

Left: Movie of the (re)formation of Co nanoparticles from hollow-core oxide particles when heated from 250°C to 350°C in 1 bar of flowing oxygen.

Reference: H.L. Xin, K. Niu, D.H. Alsem and H. Zheng.  “In-Situ TEM Study of Catalytic Nanoparticle Reactions in Atmospheric Pressure Gas Environment,” Microscopy & Microanalysis 19 (2013) pp. 1558. Abstract

Copyright © Microscopy Society of America, 2013

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Selected Catalysis Publications

Chen Houa, Jiuhui Hanb, Pan Liua, Chuchu Yangb, Gang Huangb, Takeshi Fujitab, Akihiko Hiratab, and Mingwei Chen. “Operando observations of RuO2 catalyzed Li2O2 formation and decomposition in a Li-O2 micro-battery,” Nano Energy (2018) Abstract
Yimin A. Wu, Liang Li, Zheng Li, Alper Kinaci, Maria K. Y. Chan, Yugang Sun, Jeffrey R. Guest, Ian McNulty, Tijana Rajh, and Yuzi Liu. “Visualizing Redox Dynamics of a Single Ag/AgCl Heterogeneous Nanocatalyst at Atomic Resolution,” ACS Nano (2016) Abstract
Y. Li, D. Zakharov, S. Zhao, R. Tappero, U. Jung, A. Elsen, Ph. Baumann, R.G. Nuzzo, E.A. Stach & A.I. Frenkel, “Complex structural dynamics of nanocatalysts revealed in Operando conditions by correlated imaging and spectroscopy probes”. Nature Communications (2015) Abstract
H.L. Xin, K. Niu, D.H. Alsem, and H. Zheng. “In-Situ TEM Study of Catalytic Nanoparticle Reactions in Atmospheric Pressure Gas Environment,” Microscopy and Microanalysis (2013) Abstract
S.M. Kim, C.L. Pint, P.B. Amama, R.H. Hauge, B. Maruyama, E.A. Stach. “Catalyst and catalyst support morphology evolution in single-walled carbon nanotube supergrowth: Growth deceleration and termination,” Journal of Material Resolution (2010) Abstract


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