When I want to carry out this test for coin cells. For each scan rate should we use fresh batteries or we should use the same battery for all different scan rates?
Is the potential fixed every scan rates (1-5 mV/s) for dunn method ,because the peaks are slightly varying for each scan rates? Can we take the fixed potential only?
First of all I never experience this cases yet. My suggestion is choose the dominant Redox peak at fixed potential. Then declare the K1 and K2 value that you used for the capacitive current calculation.
Thank you sir for this extensive video but I have one doubt that in step 2 , we will have peak current values from oxidation process and reduction process leading two k1 values and two k2 values. Which value of k1 and k2 (i.e obtained from oxidation and reduction both) to be taken to calculate the percentage?
Dear Dr. Muhammad Norhaffis, I calculated EDLC and pseudocapacitance (PC) contributions at different voltages. I am getting EDLC contributions ranging from 48% -90%. Along with this variation in EDLC contribution, how can I decide on a particular voltage to plot the EDLC contribution curve? You are using only one voltage which is 0.35 V. But I suggest that you should also check the percentage of EDLC contribution at different voltages for better understanding.
Rafter and Oafter is important to estimate the contribution graph. For example your contribution is 50%, thus Oafter and Rafter is half of your oxidation and reduction current. Thus its mimics your contribution graph.
Hello sir, I got the calculation part everything i did, But how to cover the area of cv curve.. As like ur previous vedio there is green colour area covered inside the cv curve..how can we do that Please tell me sir
Sorry I dont have experience on DRT analysis. Below might be some lead for you. DRT (Distribution of Relaxation Times) analysis from EIS (Electrochemical Impedance Spectroscopy) is a powerful tool used to analyze and interpret impedance data by decomposing it into contributions from different processes occurring in the electrochemical system. Here’s an overview of the process and its significance: Concept and Purpose EIS Data: EIS provides information on the impedance of a system over a range of frequencies, capturing contributions from various electrochemical processes like charge transfer, diffusion, and double-layer capacitance. DRT Analysis: DRT analysis aims to resolve these overlapping processes by transforming the impedance data into a spectrum of relaxation times, each corresponding to a different process. Key Steps in DRT Analysis Data Collection: Measure the impedance spectrum using an EIS setup, obtaining data points of impedance (Z) as a function of frequency (ω). Mathematical Transformation: Convert the impedance data to the frequency domain, often using Fourier or Laplace transforms. Regularization: Apply regularization techniques to stabilize the solution, as the transformation process can amplify noise and lead to ill-posed problems. Reconstruction: Reconstruct the distribution of relaxation times, typically represented as a plot showing the intensity of relaxation processes as a function of time constant (τ). Interpretation Peak Analysis: Peaks in the DRT spectrum correspond to distinct relaxation processes. The position and height of these peaks provide information on the time constants and strengths of the respective processes. Process Identification: By comparing the time constants with known values for specific electrochemical processes, one can identify the underlying mechanisms (e.g., charge transfer resistance, diffusion resistance). Applications Battery and Fuel Cell Analysis: DRT analysis helps in understanding the contributions of various electrochemical processes, which is crucial for optimizing performance and diagnosing issues. Corrosion Studies: Identifies the different processes involved in corrosion mechanisms, aiding in the development of better protective coatings. Material Characterization: Provides insights into the electrochemical properties of materials, such as conductivity and reaction kinetics. Advantages of DRT Analysis Resolution of Overlapping Processes: Unlike traditional EIS analysis, DRT can separate processes that have overlapping frequency responses. Detailed Insight: Offers a more detailed and nuanced understanding of the electrochemical system by decomposing the impedance data into individual relaxation processes. Example Let's say we have an EIS measurement of an electrochemical cell and want to perform DRT analysis. The steps might look like this: EIS Measurement: Collect impedance data at frequencies ranging from 1 mHz to 1 kHz. Data Transformation: Use a software tool to convert the impedance data into a DRT spectrum. Regularization: Apply Tikhonov regularization to handle noise and obtain a stable solution. DRT Spectrum: Analyze the resulting spectrum, identifying peaks corresponding to charge transfer (e.g., 0.1 s), double-layer capacitance (e.g., 1 ms), and diffusion processes (e.g., 10 s). By performing DRT analysis, you can gain a clearer picture of the electrochemical processes in your system, enabling more targeted improvements and optimizations.
Nice video sir. But it is requested that can you make the video while you are plotting the graphs? Not like this already prepared ppt slides. 🎉🎉 Thank you sir
Please help me for solution this problem If you can If you know A 1.000 g sample of zinc metal is dissolved in 50 mL of 6 M HCl solution and diluted to the mark in a 250 mL volumetric flask. A 25.00 mL portion is transferred to a polarographic cell and oxygen is flushed out. A polarogram in the range 0 - 1 V (vs. the Hg-pool electrode) shows a wave at E1/2 = -0.65 V, id = 32.0 units of galvanometer deflection. A 5.00 mL portion of 5.00 x 10-4 M CdCi2 solution is added directly to the polarography cell which already contains the Zn solution, oxygen is again flushed out, and a second polarogram is taken. The wave shows the same E1/2 but the id is 77.5 units. Calculate the percent by weight of Cd impurity in the Zn metal. Note: Atomic weight of Cd is 112.4 g/mole.
I definitively got it. I can plot and see the nice curve now. Thank you for making this video
You are welcome ☺️.
Thank you so much for clear explanation.
Thank you so much sir for the very informative session
Most welcome 😃.
When I want to carry out this test for coin cells. For each scan rate should we use fresh batteries or we should use the same battery for all different scan rates?
@@mbusiprimemafu2155 Same battery
how to get percentage diffusion values? secondly how fit into origin that shades colour
Whether we should take the current value either from oxidation or reduction curve or both the values we have to consider
Encourage to take from oxidation peak.
@@DrHaffeast sir, any particular reason for this?
At 7:52, I need clarification on the graph for calculating the values of K1 and K2.
I have clarified on the other video. Tq
@@DrHaffeast PLEASE GIVE THE LINK OF THAT VIDEO
If the intercept (K2) value is negative what does it signifies
Tried anodic current or different potential.
thank you for your explanation!
How to calculate % contribution in that case
Tried anodic current or different potential
Is the potential fixed every scan rates (1-5 mV/s) for dunn method ,because the peaks are slightly varying for each scan rates? Can we take the fixed potential only?
Yes. The potential need to be fixed at each scan rates.
How to calculate the k1 and k2 if it has 2 or 3 redox peaks? How can we draw the captative current for this situation? Thx
First of all I never experience this cases yet. My suggestion is choose the dominant Redox peak at fixed potential. Then declare the K1 and K2 value that you used for the capacitive current calculation.
Thank you sir for this extensive video but I have one doubt that in step 2 , we will have peak current values from oxidation process and reduction process leading two k1 values and two k2 values. Which value of k1 and k2 (i.e obtained from oxidation and reduction both) to be taken to calculate the percentage?
just choose one. normally we take peak current at oxidation process.
How to calculate R^2 value?
Hi, Thank you for the video, step 7 is not clear. For example, the capacitive contribution was 59%. which CV should I choose ?? Best
Based on the example the 59% occurred at CV 1mV/s.
If you have 5 different scan rate and you want to plot the contribution CV curves for all scan rate. Then, you must repeated step 7 five times.
Dear Dr. Muhammad Norhaffis, I calculated EDLC and pseudocapacitance (PC) contributions at different voltages. I am getting EDLC contributions ranging from 48% -90%. Along with this variation in EDLC contribution, how can I decide on a particular voltage to plot the EDLC contribution curve? You are using only one voltage which is 0.35 V. But I suggest that you should also check the percentage of EDLC contribution at different voltages for better understanding.
You can choose the peak current voltage.
@@DrHaffeast OK, Thank you so much for your quick response. But what is the reason behind choosing only peak current voltage?
sir can you make the second part video regarding the contribution of diffusion and capacitive area in CV curves?
The video already cover that area.
Dr could you please explain a bit Rafter and Oafter, their role in drawing the physical graph?
Rafter and Oafter is important to estimate the contribution graph. For example your contribution is 50%, thus Oafter and Rafter is half of your oxidation and reduction current. Thus its mimics your contribution graph.
How can we verify the diffusion capacitve graph is true??
It is not a validation method. It just a supplement analysis to support your CV and GCD graph.
Ok thank you
Sir, can you make a video on calculation for diffusion coefficients through CV and GITT?
sorry. This one beyond my capabilities
Hello sir,
I got the calculation part everything i did,
But how to cover the area of cv curve..
As like ur previous vedio there is green colour area covered inside the cv curve..how can we do that
Please tell me sir
To cover the area under CV curve you can use origin software.
@@DrHaffeast Ha sir, I did it..
please can you help explain to me how you color the cv inside the bigger one using origin, giving me trouble @@swarnashet9678
Could you please explain how to fill that area in origin??
@@swarnashet9678 how to fill area with colour??
Can you make video about DRT analysis from EIS. Thank you.
Sorry I dont have experience on DRT analysis. Below might be some lead for you. DRT (Distribution of Relaxation Times) analysis from EIS (Electrochemical Impedance Spectroscopy) is a powerful tool used to analyze and interpret impedance data by decomposing it into contributions from different processes occurring in the electrochemical system. Here’s an overview of the process and its significance:
Concept and Purpose
EIS Data: EIS provides information on the impedance of a system over a range of frequencies, capturing contributions from various electrochemical processes like charge transfer, diffusion, and double-layer capacitance.
DRT Analysis: DRT analysis aims to resolve these overlapping processes by transforming the impedance data into a spectrum of relaxation times, each corresponding to a different process.
Key Steps in DRT Analysis
Data Collection: Measure the impedance spectrum using an EIS setup, obtaining data points of impedance (Z) as a function of frequency (ω).
Mathematical Transformation: Convert the impedance data to the frequency domain, often using Fourier or Laplace transforms.
Regularization: Apply regularization techniques to stabilize the solution, as the transformation process can amplify noise and lead to ill-posed problems.
Reconstruction: Reconstruct the distribution of relaxation times, typically represented as a plot showing the intensity of relaxation processes as a function of time constant (τ).
Interpretation
Peak Analysis: Peaks in the DRT spectrum correspond to distinct relaxation processes. The position and height of these peaks provide information on the time constants and strengths of the respective processes.
Process Identification: By comparing the time constants with known values for specific electrochemical processes, one can identify the underlying mechanisms (e.g., charge transfer resistance, diffusion resistance).
Applications
Battery and Fuel Cell Analysis: DRT analysis helps in understanding the contributions of various electrochemical processes, which is crucial for optimizing performance and diagnosing issues.
Corrosion Studies: Identifies the different processes involved in corrosion mechanisms, aiding in the development of better protective coatings.
Material Characterization: Provides insights into the electrochemical properties of materials, such as conductivity and reaction kinetics.
Advantages of DRT Analysis
Resolution of Overlapping Processes: Unlike traditional EIS analysis, DRT can separate processes that have overlapping frequency responses.
Detailed Insight: Offers a more detailed and nuanced understanding of the electrochemical system by decomposing the impedance data into individual relaxation processes.
Example
Let's say we have an EIS measurement of an electrochemical cell and want to perform DRT analysis. The steps might look like this:
EIS Measurement: Collect impedance data at frequencies ranging from 1 mHz to 1 kHz.
Data Transformation: Use a software tool to convert the impedance data into a DRT spectrum.
Regularization: Apply Tikhonov regularization to handle noise and obtain a stable solution.
DRT Spectrum: Analyze the resulting spectrum, identifying peaks corresponding to charge transfer (e.g., 0.1 s), double-layer capacitance (e.g., 1 ms), and diffusion processes (e.g., 10 s).
By performing DRT analysis, you can gain a clearer picture of the electrochemical processes in your system, enabling more targeted improvements and optimizations.
@@DrHaffeast Thank you so much.
Nice video sir. But it is requested that can you make the video while you are plotting the graphs? Not like this already prepared ppt slides. 🎉🎉 Thank you sir
Sorry now i got some fever n cold. Later If I have time, I will make some videos. ok
@@DrHaffeast
Ohh i pray to Allah may you get well soon.. in sha Allah.
@@DrHaffeast
Sir can you tell me where are you from and your lab address.
If the current read is 0.222 for one potential, then the new current should be 0.72*0.222?? This is what you mean??
yes indeed.
@@DrHaffeasthow sir?
Please help me for solution this problem
If you can
If you know
A 1.000 g sample of zinc metal is dissolved in 50 mL of 6 M HCl solution and diluted to the mark in a 250 mL volumetric flask. A 25.00 mL portion is transferred to a polarographic cell and oxygen is flushed out. A polarogram in the range 0 - 1 V (vs. the Hg-pool electrode) shows a wave at E1/2 = -0.65 V, id = 32.0 units of galvanometer deflection. A 5.00 mL portion of 5.00 x 10-4 M CdCi2 solution is added directly to the polarography cell which already contains the Zn solution, oxygen is again flushed out, and a second polarogram is taken. The wave shows the same E1/2 but the id is 77.5 units. Calculate the percent by weight of Cd impurity in the Zn metal. Note: Atomic weight of Cd is 112.4 g/mole.