Different Approach to Estimation of Hydrogen-Binding Energy in Nanospace-Engineered Activated Carbons

2013 ◽  
Vol 118 (2) ◽  
pp. 955-961 ◽  
Author(s):  
L. Firlej ◽  
M. Beckner ◽  
J. Romanos ◽  
P. Pfeifer ◽  
B. Kuchta
Keyword(s):  
Binding Energy ◽  
Activated Carbons ◽  
Hydrogen Binding

Silicon-Hydrogen Bonds in Boron and Phosphorous Doped Polycrystalline Silicon Thin Films

2004 ◽  
Vol 808 ◽  
Author(s):  
R. Saleh ◽  
N. H. Nickel
Keyword(s):  
Binding Energy ◽  
Polycrystalline Silicon ◽  
Binding Energies ◽  
Vibration Modes ◽  
Laser Crystallization ◽  
Hydrogen Binding ◽  
Local Vibration ◽  
Silicon Thin Films ◽  
The One ◽  
Hydrogen Effusion

ABSTRACTHydrogen bonding in laser crystallized boron and phosphorous doped polycrystalline silicon is investigated using Raman spectroscopy and hydrogen effusion measurements. During laser crystallization the intensity of the local vibration modes near 2000 and 2100 cm−1 decreases. The intensity of vibration mode at 2000 cm−1 decreases faster than the one at 2100 cm−1. From H effusion measurements, the hydrogen density-of-states (H DOS) distribution is derived. For undoped amorphous silicon the H DOS exhibits two prominent peaks at hydrogen binding energies of E– μH = –1.1 and –1.5 eV. In B doped a-Si:H the peak at –1.1 eV is less pronounced while in P doped a-Si:H the H binding energy increases by about 0.1 eV. In all samples laser crystallization causes an increase of the H binding energy by about 0.2 – 0.3 eV. However, the peaks in the H DOS observed in B-doped samples are preserved during laser crystallization.

scholarly journals Correlating hydrogen oxidation and evolution activity on platinum at different pH with measured hydrogen binding energy

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Wenchao Sheng ◽  
Zhongbin Zhuang ◽  
Minrui Gao ◽  
Jie Zheng ◽  
Jingguang G. Chen ◽  
...  
Keyword(s):  
Binding Energy ◽  
Hydrogen Oxidation ◽  
Hydrogen Binding

Hydrogen Structures in Heavily Hydrogenated Crystalline and Amorphous Silicon

1998 ◽  
Vol 513 ◽  
Author(s):  
W. B. Jackson ◽  
A. Franz ◽  
Y. Chabal ◽  
M. K. Weldon ◽  
H.-C. Jin ◽  
...  
Keyword(s):  
Binding Energy ◽  
Ir Spectra ◽  
Amorphous Silicon ◽  
Deformation Mode ◽  
Hydrogen Binding ◽  
Transport Barrier ◽  
Surface Evolution ◽  
Amorphous Si ◽  
Two Peaks ◽  
Strong Mode

ABSTRACTThe hydrogen binding energy distribution and IR spectra of hydrogen platelets in c-Si have been measured and compared to H in other forms of silicon including hydrogenated polycrystalline and amorphous Si. The binding distribution for platelet containing samples, determined using H evolution, exhibits two peaks: a bulk peak at 1.8–1.9 eV below the transport barrier, and a second possibly surface related peak 1.8–1.9 eV below the surface evolution barrier. The bulk peak grows at 250C and is consistent with calculated energies for platelet structures. The same two evolution peaks are found in hydrogenated polycrystalline Si and amorphous silicon. The IR spectra for heavily hydrogenated c-Si are dominated by the stretching modes at 2076 and 2128 cm-1. Most surprisingly there appears to be a strong mode at 856 cm-1 which is associated with a deformation mode of SiH3. Even more surprising, this SiH3 856 cm-1 mode remains until 550 C indicating that the SiH3 containing structures are rather stable.

Mo modulation effect on the hydrogen binding energy of hexagonal-close-packed Ru for hydrogen evolution

2019 ◽  
Vol 7 (6) ◽  
pp. 2780-2786 ◽  
Author(s):  
Zhen Zhang ◽  
Ping Li ◽  
Qi Wang ◽  
Qi Feng ◽  
Youkun Tao ◽  
...  
Keyword(s):  
Binding Energy ◽  
Electrochemical Performance ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Modulation Effect ◽  
Hydrogen Binding ◽  
Hexagonal Close Packed ◽  
Excellent Electrochemical Performance

Hexagonal-close-packed (hcp) MoRu3 with Pt-like hydrogen binding energy exhibits excellent electrochemical performance when used as a hydrogen evolution reaction (HER) catalyst.

Interaction of Hydrogen Atoms with Vacancies and Divacancies in bcc Iron

2016 ◽  
Vol 870 ◽  
pp. 550-557 ◽  
Author(s):  
A.V. Verkhovykh ◽  
A.A. Mirzoev ◽  
G.E. Ruzanova ◽  
D.A. Mirzaev ◽  
K.Yu. Okishev
Keyword(s):  
Binding Energy ◽  
Ab Initio ◽  
Formation Energy ◽  
Equilibrium Concentration ◽  
Dft Method ◽  
Hydrogen Binding ◽  
Hydrogen Atoms ◽  
Single Vacancy ◽  
Bcc Iron ◽  
Hydrogen Interaction

The paper presents the results of both ab initio and thermodynamic analysis of vacancy and divacancy formation and hydrogen interaction with them in alpha (bcc) iron. Ab initio calculations were performed by DFT method using LAPW in WIEN2k package. Monovacancy formation energy was found to be 2.15 eV and divacancy binding energy 0.22 ± 0.01 eV. Equlibrium fraction of vacancies bound into divacancies is of the order of 10–5 even at the highest temperatures close to bcc → fcc transformation point. Hydrogen has a strong interaction with monovacancies (vacancy-hydrogen binding energy decreasing from 0.60 to 0.31 eV for the first–fifth H atom inside a single vacancy) but has only a small effect on divacancy formation energy that is equal to 0.28, 0.19 and 0.17 for the case of joining of VH + V, VH + VH and VH2 + VH2, respectively. This means that the presence of hydrogen cannot significantly increase the equilibrium concentration of divacancies.

scholarly journals Universal dependence of hydrogen oxidation and evolution reaction activity of platinum-group metals on pH and hydrogen binding energy

2016 ◽  
Vol 2 (3) ◽  
pp. e1501602 ◽  
Author(s):  
Jie Zheng ◽  
Wenchao Sheng ◽  
Zhongbin Zhuang ◽  
Bingjun Xu ◽  
Yushan Yan
Keyword(s):  
Binding Energy ◽  
Hydrogen Oxidation ◽  
Ph Dependence ◽  
Platinum Group Metals ◽  
Hydrogen Binding ◽  
Hydrogen Oxidation Reaction ◽  
Promoting Effect ◽  
Onset Potential ◽  
Co Stripping ◽  
Platinum Group

Understanding how pH affects the activity of hydrogen oxidation reaction (HOR) and hydrogen evolution reaction (HER) is key to developing active, stable, and affordable HOR/HER catalysts for hydroxide exchange membrane fuel cells and electrolyzers. A common linear correlation between hydrogen binding energy (HBE) and pH is observed for four supported platinum-group metal catalysts (Pt/C, Ir/C, Pd/C, and Rh/C) over a broad pH range (0 to 13), suggesting that the pH dependence of HBE is metal-independent. A universal correlation between exchange current density and HBE is also observed on the four metals, indicating that they may share the same elementary steps and rate-determining steps and that the HBE is the dominant descriptor for HOR/HER activities. The onset potential of CO stripping on the four metals decreases with pH, indicating a stronger OH adsorption, which provides evidence against the promoting effect of adsorbed OH on HOR/HER.

Controlling hydrogen evolution reaction activity on Ni core–Pt island nanoparticles by tuning the size of the Pt islands

2021 ◽  
Author(s):  
Ali Alinezhad ◽  
Tania M. Benedetti ◽  
Jiaxin Lian ◽  
Vinicius R. Gonçales ◽  
J. Justin Gooding ◽  
...  
Keyword(s):  
Binding Energy ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Ni Nanoparticles ◽  
Hydrogen Binding

Pt islands with different sizes were grown on amorphous Ni nanoparticles, allowing the tuning of the Pt–Ni interface without changing the hydrogen binding energy of the Pt sites.

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