What is the use of half-wave potential?
Because of these factors, half-wave potential measurements in electrochemical cells can be used to determine specific analyte concentrations, reaction rates, and valence states by comparing the measurements with some well-known reference.
What is half-wave potential in Orr?
The value of half-wave potential (E1/2) indicates the capability of catalysts in reducing the ORR over-potential [26]. Pt/Vulcan presents the highest E1/2, 854 mV, whereas both Pd catalysts present similar values, around 847 mV, indicating a poorer behavior towards the ORR, as already observed.
What is half-wave equation?
We consider the half-wave equation with mass critical in two dimensions {iut=Du−|u|u,u(t0,x)=u0(x), First, we prove the existence of a family of traveling solitary waves.
What does E1/2 tell you?
For reversible system E1/2 is mean of anodic and cathodic peak potential..But for irreversible system E1/2 is the potential at which value of current is half of the peak current. you can use this expresion if you have a reversible redox wave. the mean between anodic peak and cathodic peak.
What is theory of polarography?
The simple principle of polarography is the study of solutions or of electrode processes by means of electrolysis with two electrodes, one polarizable and one unpolarizable, the former formed by mercury regularly dropping from a capillary tube.
What is Tafel plot discuss half wave potential?
A Tafel plot is a graphical plot (usually logarithmic) showing the relationship between the current generated in an electrochemical cell and the electrode potential of a specific metal. These plots are usually generated based on electrochemical experiments performed under controlled conditions.
What are the disadvantages of half-wave rectifier circuit?
The disadvantages of half-wave rectifiers are:
- They only allow a half-cycle through per sinewave, and the other half-cycle is wasted. This leads to power loss.
- They produces a low output voltage.
- The output current we obtain is not purely DC, and it still contains a lot of ripple (i.e. it has a high ripple factor)
What is EP in electrochemistry?
Ep/2 is the potential corresponding to half the peak current (Ip). It is called the half-peak potential. E1/2 is a good approximation of E0 of the redox system. E1/2 = E0′ when the diffusion coefficients of O and R are equal. It is also called half-wave potential.
What is electrode potential and electrode potential difference in an electrochemical cell?
The key difference between electrode potential and cell potential is that electrode potential refers to the ability of an electrode in a cell to get reduced or oxidized whereas cell potential is the difference between the electrode potentials of the electrodes present in an electrochemical cell.
Why mercury is used in DME?
The pool of mercury acts as a counter electrode, i.e., anode if DME is cathode or cathode if DME is the anode. The counter electrode is a non-polarisable electrode. To the analyte solution, electrolyte like KCl is added i.e., 50-100 times of sample concentration.
What is the half wave potential in chemistry?
poluvalni potencijal. Half-wave potential (E1/2) is a potential at which polarographic wave current is equal to one half of diffusion current (id).
What does half wavelength mean in AC transmission?
Yuping Zheng, in Protection Technologies of Ultra-High-Voltage AC Transmission Systems, 2020 Half-wavelength AC transmission (HWACT) is an ultra-long-distance AC transmission technology, whose transmission distance is close to half-wavelength at the system power frequency.
What are the radiation characteristics of a half wavelength dipole?
The radiation characteristics of the half wavelength dipole may be derived on the basis that, for a thin dipole, the current distribution along the antenna is approximately sinusoidal, as shown in Figure 6.10. In this figure the value of the current distribution is given by Equation 6.39 and E0 by Equation 6.40.
Which is the principal canonical antenna with length near a half wavelength?
The resonant dipole, with length near a half wavelength, is a principal canonical antenna. The half-wave dipole has a rotationally symmetric pattern of cos [ (π/2) cos θ]/sin θ, where θ = 0° gives the dipole axis.