scholarly journals Elucidating the alkaline oxygen evolution reaction mechanism on platinum

2017 ◽  
Vol 5 (23) ◽  
pp. 11634-11643 ◽  
Author(s):  
M. Favaro ◽  
C. Valero-Vidal ◽  
J. Eichhorn ◽  
F. M. Toma ◽  
P. N. Ross ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Reaction Mechanism ◽  
Surface Chemistry ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Energy Production ◽  
Sustainable Energy ◽  
Liquid Interface ◽  
Solid Liquid Interface ◽  
Solid Liquid

Understanding the interplay between surface chemistry, electronic structure, and reaction mechanism of the catalyst at the electrified solid/liquid interface will enable the design of more efficient materials systems for sustainable energy production.

MoS2-modified porous gas diffusion layer with air–solid–liquid interface for efficient electrocatalytic water splitting

Nanoscale ◽  
2018 ◽  
Vol 10 (32) ◽  
pp. 15324-15331 ◽  
Author(s):  
Chenxi Sui ◽  
Kai Chen ◽  
Liming Zhao ◽  
Li Zhou ◽  
Qu-Quan Wang
Keyword(s):  
Proton Transfer ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Oxygen Evolution Reaction ◽  
Gas Diffusion ◽  
Gas Evolution ◽  
Solid Liquid Interface ◽  
Solid Liquid

The formation and adsorption of bubbles on electrodes weaken the efficiency of gas evolution reactions such as the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) by hindering proton transfer and consuming nucleation energy.

scholarly journals Nanoscale Mapping of Non-Uniform Heterogeneous Nucleation Kinetics Mediated by Surface Chemistry

2019 ◽  
Author(s):  
Mei Wang ◽  
Thilini Umesha Dissanayake ◽  
Chiwoo Park ◽  
Karen J. Gaskell ◽  
Taylor Woehl
Keyword(s):  
Electron Microscopy ◽  
Liquid Phase ◽  
Surface Chemistry ◽  
Heterogeneous Nucleation ◽  
Liquid Interface ◽  
Nucleation Kinetics ◽  
Nucleation Sites ◽  
Solid Liquid Interface ◽  
Solid Liquid

<p>Nucleation underlies the formation of many liquid-phase synthetic and natural materials with applications in materials chemistry, geochemistry, biophysics, and structural biology. Most liquid-phase nucleation processes are heterogeneous, occurring at specific nucleation sites at a solid-liquid interface; however, the chemical and topographical identity of these nucleation sites and how nucleation kinetics vary from site-to-site remains mysterious. Here we utilize <i>in situ</i> liquid cell electron microscopy to unveil counterintuitive nanoscale non-uniformities in heterogeneous nucleation kinetics on a macroscopically uniform solid-liquid interface. Time-resolved <i>in situ</i> electron microscopy imaging of silver nanoparticle nucleation at a water-silicon nitride interface showed apparently randomly-located nucleation events at the interface. However, nanometric maps of local nucleation kinetics uncovered nanoscale interfacial domains with either slow or rapid nucleation. Interestingly, the interfacial domains vanished at high supersaturation ratio, giving way to rapid spatially uniform nucleation kinetics. Atomic force microscopy and nanoparticle labeling experiments revealed a topographically flat, chemically heterogeneous interface with nanoscale interfacial domains of functional groups similar in size to those observed in the nanometric nucleation maps. These results, along with a semi-quantitative nucleation model, indicate that a chemically non-uniform interface presenting different free energy barriers to heterogeneous nucleation underlies our observations of non-uniform nucleation kinetics. Overall, our results introduce a new imaging modality, nanometric nucleation mapping, and provide important new insights into the impact of surface chemistry on microscopic spatial variations in heterogeneous nucleation kinetics that have not been previously observed.</p>

Nanoscale Mapping of Non-Uniform Heterogeneous Nucleation Kinetics Mediated by Surface Chemistry

2019 ◽  
Author(s):  
Mei Wang ◽  
Thilini Umesha Dissanayake ◽  
Chiwoo Park ◽  
Karen J. Gaskell ◽  
Taylor Woehl
Keyword(s):  
Electron Microscopy ◽  
Liquid Phase ◽  
Surface Chemistry ◽  
Heterogeneous Nucleation ◽  
Liquid Interface ◽  
Nucleation Kinetics ◽  
Nucleation Sites ◽  
Solid Liquid Interface ◽  
Solid Liquid

<p>Nucleation underlies the formation of many liquid-phase synthetic and natural materials with applications in materials chemistry, geochemistry, biophysics, and structural biology. Most liquid-phase nucleation processes are heterogeneous, occurring at specific nucleation sites at a solid-liquid interface; however, the chemical and topographical identity of these nucleation sites and how nucleation kinetics vary from site-to-site remains mysterious. Here we utilize <i>in situ</i> liquid cell electron microscopy to unveil counterintuitive nanoscale non-uniformities in heterogeneous nucleation kinetics on a macroscopically uniform solid-liquid interface. Time-resolved <i>in situ</i> electron microscopy imaging of silver nanoparticle nucleation at a water-silicon nitride interface showed apparently randomly-located nucleation events at the interface. However, nanometric maps of local nucleation kinetics uncovered nanoscale interfacial domains with either slow or rapid nucleation. Interestingly, the interfacial domains vanished at high supersaturation ratio, giving way to rapid spatially uniform nucleation kinetics. Atomic force microscopy and nanoparticle labeling experiments revealed a topographically flat, chemically heterogeneous interface with nanoscale interfacial domains of functional groups similar in size to those observed in the nanometric nucleation maps. These results, along with a semi-quantitative nucleation model, indicate that a chemically non-uniform interface presenting different free energy barriers to heterogeneous nucleation underlies our observations of non-uniform nucleation kinetics. Overall, our results introduce a new imaging modality, nanometric nucleation mapping, and provide important new insights into the impact of surface chemistry on microscopic spatial variations in heterogeneous nucleation kinetics that have not been previously observed.</p>

Observation of Femtosecond Acoustic Anomaly in a Solid Liquid Interface

2020 ◽  
Vol 124 (5) ◽  
pp. 2987-2993
Author(s):  
Chi-Kuang Sun ◽  
Yi-Ting Yao ◽  
Chih-Chiang Shen ◽  
Mu-Han Ho ◽  
Tien-Chang Lu ◽  
...  
Keyword(s):  
Liquid Interface ◽  
Acoustic Anomaly ◽  
Solid Liquid Interface ◽  
Solid Liquid
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