In this study, we developed a logical and complete mathematical analysis of the relationship between the discrete Fourier transform (DFT) magnitude and periodic feature of a signal. The physical meaning of the DFT magnitude index corresponds to the periodic signal feature; further analysis makes ...
To date, the effect of oxidation state on activity remains controversial in whether higher or lower oxidation states benefit the enhancement of catalytic activity. Herein, we discover a volcanic relationship between oxidation state and hydrogen evolution reaction activity based on Os single-atom catalysts...
/g) and uniform distribution of active sites on the surface further promote the activity. The mechanism of NO direct decomposition is elucidated by in situ Diffuse reflectance infrared Fourier transform spectroscopy, 18O2 isotopic transient exchange experiments and density functional theory (DFT) ...
49,50,51. Note that our DFT calculations predict the top-adsorbed CO stretching frequencies are 2061 cm−1over Pt(111) and 2021 cm−1over Pt/Cu SAA, which are very close
The reversible peak shifts are attributed to the continuous lattice expansion and contraction during the dis- charge and charge respectively. This result demonstrates a typical single-phase (solid-solution) reaction during the discharge and charge process in the sodium cell. DFT simulations. It is ...
The most suitable solution to detect these frequency components and changes is the use of a Discrete Fourier Transform (DFT) [17,18]. In order to apply DFT to vibration signals, signals that change depending on time must be sampled at a certain time interval and converted into discrete time...
Many publications describe a linear correlation between the specific activity of Pt –M catalysts in the ORR and the average Pt-Pt interatomic distance in bimetallic NPs. The smaller the average interatomic distance Pt-Pt, the higher the activity of the catalyst in the ORR. Thermal treatment of...
Values of the discharge coefficient, µ, which slightly differ from 0.6 could also be taken into account, by considering the unified equation developed by Swamee and Swamee [37] that provides a smooth transition between viscous and potential flows. 2.1. Deriving Stage Variation–Discharge ...