Revealing the Role of Surface Composition on the Particle Mobility and Coalescence of Carbon-Supported Pt Alloy Fuel Cell Catalysts by In Situ Heating (S)TEM

ACS Catalysis ◽  
2020 ◽  
Vol 10 (13) ◽  
pp. 7381-7388
Author(s):  
Xiaozhang Yao ◽  
Yinping Wei ◽  
Zhongxiang Wang ◽  
Lin Gan
Keyword(s):  
Fuel Cell ◽  
Surface Composition ◽  
Particle Mobility ◽  
Fuel Cell Catalysts ◽  
Pt Alloy ◽  
In Situ Heating

scholarly journals Effect of Grain Size Distribution on Recrystallisation Kinetics in an Fe-30Ni Model Alloy

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 369 ◽  
Author(s):  
Mo Ji ◽  
Claire Davis ◽  
Martin Strangwood
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Cold Deformation ◽  
Avrami Exponent ◽  
Model Alloy ◽  
Avrami Parameter ◽  
In Situ Heating

This paper discusses the role of grain size distribution on the recrystallisation rates and Avrami values for a Fe-30 wt. % Ni steel, which was used as a model alloy retaining an austenitic structure to room temperature. Cold deformation was used to provide uniform macroscopic strain distributions (strains of 0.2 and 0.3), followed by recrystallisation during annealing at 850–950 °C. It was shown that the Avrami parameter was directly related to the grain size distribution, with a lower Avrami exponent being seen for a larger average and wider grain size distribution. A method to predict the Avrami exponent from the grain size distribution was proposed. In situ heating in an SEM with EBSD showed the recrystallisation kinetics to be affected by differences in stored energy and nucleation in the different grain sizes supporting the proposed relationship.

scholarly journals Balance of Nanostructure and Bimetallic Interactions in Pt Model Fuel Cell Catalysts: In Situ XAS and DFT Study

2012 ◽  
Vol 134 (23) ◽  
pp. 9664-9671 ◽  
Author(s):  
Daniel Friebel ◽  
Venkatasubramanian Viswanathan ◽  
Daniel J. Miller ◽  
Toyli Anniyev ◽  
Hirohito Ogasawara ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Dft Study ◽  
In Situ Xas ◽  
Model Fuel ◽  
Fuel Cell Catalysts

scholarly journals In situ Liquid TEM Study for Degradation Mechanisms of Fuel Cell Catalysts during Potential Cycling Test

2015 ◽  
Vol 21 (S3) ◽  
pp. 1295-1296 ◽  
Author(s):  
Shinya Nagashima ◽  
Kenta Yoshida ◽  
Tomoki Hiroyama ◽  
Kun Liu ◽  
Yipu Kang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Degradation Mechanisms ◽  
Potential Cycling ◽  
Cycling Test ◽  
Fuel Cell Catalysts

scholarly journals Real-time imaging of activation and degradation of carbon supported octahedral Pt–Ni alloy fuel cell catalysts at the nanoscale using in situ electrochemical liquid cell STEM

2019 ◽  
Vol 12 (8) ◽  
pp. 2476-2485 ◽  
Author(s):  
Vera Beermann ◽  
Megan E. Holtz ◽  
Elliot Padgett ◽  
Jorge Ferreira de Araujo ◽  
David A. Muller ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Real Time ◽  
Electrochemical Activation ◽  
Real Time Imaging ◽  
Ni Alloy ◽  
Fuel Cell Catalysts ◽  
Nanoscale Imaging ◽  
Liquid Cell

In situ nanoscale imaging of the electrochemical activation and degradation of carbon-supported octahedral Pt–Ni nanocatalysts in real time.

Role of Ions in Bias Enhanced Nucleation of Diamond

1995 ◽  
Vol 388 ◽  
Author(s):  
J.M. Lannon ◽  
J.S. Gold ◽  
Cd. Stinespring
Keyword(s):  
Thin Films ◽  
Silicon Carbide ◽  
Surface Composition ◽  
Hydrogen Ions ◽  
Ion Energy ◽  
Transfer Processes ◽  
Ion Interactions ◽  
Ion Energies

AbstractIon-surface interactions are thought to play a role in bias enhanced nucleation of diamond. To explore this hypothesis and understand the mechanisms, surface studies of hydrogen and hydrocarbon ion interactions with silicon and silicon carbide have been performed. the experiments were carried out at room temperature and used in-situ auger analyses to monitor the surface composition of thin films produced or modified by the ions. Ion energies ranged from 10 to 2000 eV. Hydrogen ions were found to modify silicon carbide thin films by removing silicon and converting the resulting carbon-rich layers to a mixture of sp2- and sp3-C. the interaction of hydrocarbon ions with silicon was shown to produce a thin film containing SiC-, sp2-, and sp3-C species. IN general, the relative amount of each species formed was dependent upon ion energy, fluence, and mass. the results of these studies, interpreted in terms of chemical and energy transfer processes, provide key insights into the mechanisms of bias enhanced nucleation.

In Situ Heating of the Nightside Martian Upper Atmosphere and Ionosphere: The Role of Solar Wind Electron Precipitation

2021 ◽  
Vol 909 (2) ◽  
pp. 108
Author(s):  
D.-D. Niu ◽  
J. Cui ◽  
H. Gu ◽  
X. -S. Wu ◽  
Y. -T. Cao ◽  
...  
Keyword(s):  
Solar Wind ◽  
Upper Atmosphere ◽  
Electron Precipitation ◽  
In Situ Heating ◽  
Solar Wind Electron
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