scholarly journals Hollow microstructural regulation of single-atom catalysts for optimized electrocatalytic performance

2021 ◽  
Author(s):  
A-Wu Zhou ◽  
Ding-Sheng Wang ◽  
Ya-Dong Li
Keyword(s):  
Single Atom ◽  
Electrocatalytic Performance

scholarly journals Tuning the coordination number of Fe single atoms for the efficient reduction of CO2

2020 ◽  
Vol 22 (21) ◽  
pp. 7529-7536
Author(s):  
Huihuang Chen ◽  
Xu Guo ◽  
Xiangdong Kong ◽  
Yulin Xing ◽  
Yan Liu ◽  
...  
Keyword(s):  
Coordination Number ◽  
Single Atom ◽  
Single Atoms ◽  
Electrocatalytic Performance ◽  
Efficient Reduction ◽  
Co Conversion ◽  
Reduction Of Co2

The coordination number of Fe single-atom catalysts (Fe–N5/Fe–N6) significantly affects the electrocatalytic performance during CO2-to-CO conversion.

scholarly journals Single‐Atom Catalyst Aggregates: Size‐Matching is Critical to Electrocatalytic Performance in Sulfur Cathodes

2021 ◽  
pp. 2103773
Author(s):  
Xiaodong Meng ◽  
Xing Liu ◽  
Xueying Fan ◽  
Xin Chen ◽  
Shang Chen ◽  
...  
Keyword(s):  
Single Atom ◽  
Electrocatalytic Performance ◽  
Sulfur Cathodes

Engineering the Low Coordinated Pt Single Atom to Achieve the Superior Electrocatalytic Performance toward Oxygen Reduction

Small ◽  
2020 ◽  
Vol 16 (43) ◽  
pp. 2003096 ◽  
Author(s):  
Zhongxin Song ◽  
Ya‐Nan Zhu ◽  
Hanshuo Liu ◽  
Mohammad Norouzi Banis ◽  
Lei Zhang ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Single Atom ◽  
Electrocatalytic Performance

Rhodium single-atom catalysts with enhanced electrocatalytic hydrogen evolution performance

2021 ◽  
Vol 45 (13) ◽  
pp. 5770-5774
Author(s):  
Zhipeng Yu ◽  
Junyuan Xu ◽  
Siquan Feng ◽  
Xiangen Song ◽  
Oleksandr Bondarchuk ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Hydrogen Evolution ◽  
Chemical Reaction ◽  
Hydrogen Evolution Reaction ◽  
Single Atom ◽  
Top Down ◽  
Dispersion Process ◽  
Electrocatalytic Performance

Rhodium (Rh) single-atom catalysts supported on activated carbon (Rh1/AC) are prepared via a “top-down” chemical reaction-induced dispersion process and show outstanding electrocatalytic performance for the hydrogen evolution reaction.

Modulating the Electronic Structure of Single‐Atom Catalysts on 2D Nanomaterials for Enhanced Electrocatalytic Performance

Small Methods ◽  
2019 ◽  
Vol 3 (9) ◽  
pp. 1800438 ◽  
Author(s):  
Yuanzhi Zhu ◽  
Wenchao Peng ◽  
Yang Li ◽  
Guoliang Zhang ◽  
Fengbao Zhang ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Single Atom ◽  
Electrocatalytic Performance ◽  
2D Nanomaterials

Single Atom Image Contrast in Fixed Beam Dark Field Electron Microscopy

1974 ◽  
Vol 32 ◽  
pp. 366-367
Author(s):  
Wah Chi
Keyword(s):  
Scattering Amplitude ◽  
Present Report ◽  
Dark Field ◽  
Image Contrast ◽  
Single Atom ◽  
Optical Theorem ◽  
Hartree Fock ◽  
Heavy Atoms ◽  
Beam Stop ◽  
Fixed Beam

Resolution and contrast are the important factors to determine the feasibility of imaging single heavy atoms on a thin substrate in an electron microscope. The present report compares the atom image characteristics in different modes of fixed beam dark field microscopy including the ideal beam stop (IBS), a wire beam stop (WBS), tilted illumination (Tl) and a displaced aperture (DA). Image contrast between one Hg and a column of linearly aligned carbon atoms (representing the substrate), are also discussed. The assumptions in the present calculations are perfectly coherent illumination, atom object is represented by spherically symmetric potential derived from Relativistic Hartree Fock Slater wave functions, phase grating approximation is used to evaluate the complex scattering amplitude, inelastic scattering is ignored, phase distortion is solely due to defocus and spherical abberation, and total elastic scattering cross section is evaluated by the Optical Theorem. The atom image intensities are presented in a Z-modulation display, and the details of calculation are described elsewhere.

Atomic Spectroscopy in the FIM

1986 ◽  
Vol 44 ◽  
pp. 758-761
Author(s):  
J. J. Hren ◽  
S. D. Walck
Keyword(s):  
Electron Microscope ◽  
Electric Fields ◽  
Atom Probe ◽  
Atomic Spectroscopy ◽  
Single Atom ◽  
Statistical Sampling ◽  
Commercial Instrument ◽  
Available Technology ◽  
High Electric Fields ◽  
Field Ion Microscope

The field ion microscope (FIM) has had the ability to routinely image the surface atoms of metals since Mueller perfected it in 1956. Since 1967, the TOF Atom Probe has had single atom sensitivity in conjunction with the FIM. “Why then hasn't the FIM enjoyed the success of the electron microscope?” The answer is closely related to the evolution of FIM/Atom Probe techniques and the available technology. This paper will review this evolution from Mueller's early discoveries, to the development of a viable commercial instrument. It will touch upon some important contributions of individuals and groups, but will not attempt to be all inclusive. Variations in instrumentation that define the class of problems for which the FIM/AP is uniquely suited and those for which it is not will be described. The influence of high electric fields inherent to the technique on the specimens studied will also be discussed. The specimen geometry as it relates to preparation, statistical sampling and compatibility with the TEM will be examined.

Field ion microscope investigations of atomic processes at surfaces

1989 ◽  
Vol 47 ◽  
pp. 228-229
Author(s):  
G. L. Kellogg ◽  
P. R. Schwoebel
Keyword(s):  
Single Crystal ◽  
Crystal Surface ◽  
Linear Chain ◽  
Atom Probe ◽  
Nucleation And Growth ◽  
Single Atom ◽  
Initial Structure ◽  
Atomic Processes ◽  
Single Crystal Surfaces ◽  
Field Ion Microscope

Although no longer unique in its ability to resolve individual single atoms on surfaces, the field ion microscope remains a powerful tool for the quantitative characterization of atomic processes on single-crystal surfaces. Investigations of single-atom surface diffusion, adatom-adatom interactions, surface reconstructions, cluster nucleation and growth, and a variety of surface chemical reactions have provided new insights to the atomic nature of surfaces. Moreover, the ability to determine the chemical identity of selected atoms seen in the field ion microscope image by atom-probe mass spectroscopy has increased or even changed our understanding of solid-state-reaction processes such as ordering, clustering, precipitation and segregation in alloys. This presentation focuses on the operational principles of the field-ion microscope and atom-probe mass spectrometer and some very recent applications of the field ion microscope to the nucleation and growth of metal clusters on metal surfaces.The structure assumed by clusters of atoms on a single-crystal surface yields fundamental information on the adatom-adatom interactions important in crystal growth. It was discovered in previous investigations with the field ion microscope that, contrary to intuition, the initial structure of clusters of Pt, Pd, Ir and Ni atoms on W(110) is a linear chain oriented in the <111> direction of the substrate.

Recent advancement in the electrocatalytic synthesis of ammonia

Nanoscale ◽  
2020 ◽  
Vol 12 (15) ◽  
pp. 8065-8094 ◽  
Author(s):  
Xudong Wen ◽  
Jingqi Guan
Keyword(s):  
Metal Oxide ◽  
Oxide Catalysts ◽  
Single Atom ◽  
Metal Oxide Catalysts ◽  
Metal Free ◽  
Recent Advancement ◽  
Nanocomposite Catalysts

Different kinds of electrocatalysts used in NRR electrocatalysis (including single atom catalysts, metal oxide catalysts, nanocomposite catalysts, and metal free catalysts) are introduced.

Sign in / Sign up

Export Citation Format

Share Document