scholarly journals Solvated fullerenes, a new class of carbon materials suitable for high-pressure studies: A review

2015 ◽  
Vol 84 ◽  
pp. 85-95 ◽  
Author(s):  
Lin Wang
Keyword(s):  
High Pressure ◽  
Carbon Materials ◽  
New Class ◽  
High Pressure Studies

High Pressure Studies of Quantum Well Emission and Deep Emission in GaInP(ordered)-GaAs Heterostructures

1997 ◽  
Vol 499 ◽  
Author(s):  
S. H. Kwok ◽  
P. Y. Yu ◽  
K. Uchida ◽  
T. Arai
Keyword(s):  
High Pressure ◽  
Quantum Well ◽  
Emission Band ◽  
Excitation Power ◽  
High Excitation ◽  
High Pressure Studies ◽  
Band Alignments ◽  
High Pressure Study

ABSTRACTWe report on a high pressure study of emission from a series of GaInP(ordered)/GaAs heterostructures. A so-called “deep emission” band at 1.46 eV is observed in all our samples. At high excitation power, quantum well emission emerges in only one structure where thin GaP layers are inserted on both sides of the GaAs well. From the pressure dependent emission in this sample we have determined its band alignments. The role of the GaP layers in suppressing the deep emission is elucidated.

scholarly journals Mechanochemically Synthetized PAN-Based Co-N-Doped Carbon Materials as Electrocatalyst for Oxygen Evolution Reaction

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 290
Author(s):  
Paulette Gómez-López ◽  
José Ángel Salatti-Dorado ◽  
Daily Rodríguez-Padrón ◽  
Manuel Cano ◽  
Clemente G. Alvarado-Beltrán ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Photoelectron Spectroscopy ◽  
Carbon Nanomaterials ◽  
Carbon Materials ◽  
Catalytic Performance ◽  
X Ray Diffraction ◽  
New Class ◽  
Electrocatalytic Performance ◽  
Alkaline Environments ◽  
Metal Doped

We report a new class of polyacrylonitrile (PAN)-based Co-N-doped carbon materials that can act as suitable catalyst for oxygen evolution reactions (OER). Different Co loadings were mechanochemically added into post-consumed PAN fibers. Subsequently, the samples were treated at 300 °C under air (PAN-A) or nitrogen (PAN-N) atmosphere to promote simultaneously the Co3O4 species and PAN cyclization. The resulting electrocatalysts were fully characterized and analyzed by X-ray diffraction (XRD) and photoelectron spectroscopy (XPS), transmission (TEM) and scanning electron (SEM) microscopies, as well as nitrogen porosimetry. The catalytic performance of the Co-N-doped carbon nanomaterials were tested for OER in alkaline environments. Cobalt-doped PAN-A samples showed worse OER electrocatalytic performance than their homologous PAN-N ones. The PAN-N/3% Co catalyst exhibited the lowest OER overpotential (460 mV) among all the Co-N-doped carbon nanocomposites, reaching 10 mA/cm2. This work provides in-depth insights on the electrocatalytic performance of metal-doped carbon nanomaterials for OER.

High pressure studies of Ni3[(C2H5N5)6(H2O)6](NO3)6·1.5H2O by Raman scattering, IR absorption, and synchrotron X-ray diffraction

RSC Advances ◽  
2016 ◽  
Vol 6 (69) ◽  
pp. 65031-65037 ◽  
Author(s):  
Junru Jiang ◽  
Jianguo Zhang ◽  
Peifen Zhu ◽  
Jianfu Li ◽  
Xiaoli Wang ◽  
...  
Keyword(s):  
Molecular Structure ◽  
High Pressure ◽  
Raman Scattering ◽  
Ir Absorption ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Pressure Studies

Molecular structure (a) and packing diagram (b) of 1. The green, grey, blue, red, and white spheres denote Ni, C, N, O, and H atoms, respectively.

scholarly journals High-pressure studies of palladium and platinum thioether macrocyclic dihalide complexes

2014 ◽  
Vol 70 (3) ◽  
pp. 469-486 ◽  
Author(s):  
David R. Allan ◽  
Daniel Bailey ◽  
Nigel Bird ◽  
Alexander J. Blake ◽  
Neil R. Champness ◽  
...  
Keyword(s):  
High Pressure ◽  
Density Functional ◽  
Metal Centre ◽  
Functional Theory ◽  
Chain Polymer ◽  
Metal Interactions ◽  
Metal Interaction ◽  
High Pressure Studies ◽  
Distorted Octahedral ◽  
Halide Ligands

The mononuclear macrocyclic PdIIcomplexcis-[PdCl2([9]aneS3)] ([9]aneS3= 1,4,7-trithiacyclo-nonane) converts at 44 kbar into an intensely coloured chain polymer exhibiting distorted octahedral coordination at the metal centre and an unprecedented [1233] conformation for the thioether ligand. The evolution of an intramolecular axial sulfur–metal interaction and an intermolecular equatorial sulfur–metal interaction is central to these changes. High-pressure crystallographic experiments have also been undertaken on the related complexes [PtCl2([9]aneS3)], [PdBr2([9]aneS3)], [PtBr2([9]aneS3)], [PdI2([9]aneS3)] and [PtI2([9]aneS3)] in order to establish the effects of changing the halide ligands and the metal centre on the behaviour of these complexes under pressure. While all complexes undergo contraction of the various interaction distances with increasing pressure, only [PdCl2([9]aneS3)] undergoes a phase change. Pressure-induced I...I interactions were observed for [PdI2([9]aneS3)] and [PtI2([9]aneS3)] at 19 kbar, but the corresponding Br...Br interactions in [PdBr2([9]aneS3)] and [PtBr2([9]aneS3)] only become significant at much higher pressure (58 kbar). Accompanying density functional theory (DFT) calculations have yielded interaction energies and bond orders for the sulfur–metal interactions.

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