Supercapacitor Research

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the equation that describes the relation between capacitance and specific surface area?

$C=\varepsilon\varepsilon_0A/d

How is the average pore size of carbon materials calculated?

pore size (calculated)= 4000*PV/ SSA

What does the intensity ratio between the D-band and G-band (ID/IG) characterize?

crystallization degree of carbon materials

What is the activation function used in the proposed neural network?

<p>tanh</p> Signup and view all the answers

What is the cost function used in the proposed neural network?

<p>least squares method</p> Signup and view all the answers

What is the correlation coefficient obtained from the regression analysis?

<p>0.91</p> Signup and view all the answers

What is the equation that relates energy density and voltage window?

<p>$E=CV^2$</p> Signup and view all the answers

What is the title of the article?

<p>Artificial Neural Network Enabled Capacitance Prediction for Carbon-Based Supercapacitors</p> Signup and view all the answers

Who are the authors of the article?

<p>Shan Zhu, Jiajun Li, Liying Ma, Chunnian He, Enzuo Liu, Fang He, Chunsheng Shi, Naiqin Zhao</p> Signup and view all the answers

What is the DOI of the article?

<p><a href="https://doi.org/10.1016/j.matlet.2018.09.028">https://doi.org/10.1016/j.matlet.2018.09.028</a></p> Signup and view all the answers

What is the abbreviation used for the journal?

<p>MLBLUE</p> Signup and view all the answers

When was the article received?

<p>23 July 2018</p> Signup and view all the answers

When was the article accepted?

<p>6 September 2018</p> Signup and view all the answers

What is the purpose of providing the early version of the manuscript?

<p>To serve as a service to customers and to allow for copyediting, typesetting, and review of the resulting proof before final publication.</p> Signup and view all the answers

What is the key component of a supercapacitor?

<p>The key component of a supercapacitor is the electrode.</p> Signup and view all the answers

What is the most widely used material for the electrode in supercapacitors?

<p>Carbon is the most widely used material for the electrode in supercapacitors.</p> Signup and view all the answers

What are some methods to improve the capacitance of carbon-based electrodes?

<p>Some methods to improve the capacitance of carbon-based electrodes include increasing specific surface area, controlling pore structure, and introducing surface functional groups.</p> Signup and view all the answers

What is the advantage of using an artificial neural network (ANN) for analyzing the complex variables in carbon-based supercapacitors?

<p>The advantage of using an artificial neural network (ANN) is that it can discover relationships between inputs and outputs of a system without a detailed understanding of the mechanisms involved.</p> Signup and view all the answers

What is one feasible method to obtain a sophisticated evaluation system for predicting the capacitive properties of carbon-based supercapacitors?

<p>One feasible method is to draw insights from a large amount of data.</p> Signup and view all the answers

What are some factors that affect the performance of carbon-based supercapacitors?

<p>Some factors that affect the performance of carbon-based supercapacitors include the materials' microstructures, surface functional groups, and testing details of practical application.</p> Signup and view all the answers

How many published papers about carbon-based supercapacitors were collected to build the database?

<p>More than 300 published papers about carbon-based supercapacitors were collected to build the database.</p> Signup and view all the answers

What method was used to predict the capacitance performance of carbon materials in supercapacitors?

<p>ANN technology</p> Signup and view all the answers

What were the five variables used as features in the prediction?

<p>specific surface area, calculated pore size, ID/IG ratio, N-doping level, voltage window</p> Signup and view all the answers

Which method showed the best performance in terms of accuracy?

<p>ANN</p> Signup and view all the answers

What was the error of ANN in the sample of No.5?

<p>3.3%</p> Signup and view all the answers

What were the errors of linear regression and Lasso in the sample of No.5?

<p>almost 90%</p> Signup and view all the answers

What is the superiority of ANN compared to other methods?

<p>its ability to recognize patterns in a series of input and output data without any prior assumptions about their nature and interrelations</p> Signup and view all the answers

What was the main reason for the deviation of the experiment?

<p>small number of data points</p> Signup and view all the answers

How can the accuracy of predictions be increased?

<p>by increasing the number of samples</p> Signup and view all the answers

What is the potential application of ANN technology in material science?

<p>assisting researchers in material science and application design</p> Signup and view all the answers

What are the two categories of supercapacitors?

<p>Electrochemical double-layer capacitors (EDLCs) and pseudocapacitors.</p> Signup and view all the answers

What are the advantages of activated carbons (ACs) as electrode materials in supercapacitors?

<p>Chemical stability, less weight, low cost, good electric conductivity, and environment-friendly advantage.</p> Signup and view all the answers

What is the activating agent widely used to prepare activated carbons (ACs)?

<p>KOH (potassium hydroxide).</p> Signup and view all the answers

What are the two methods to prepare nitrogen-doped carbons?

<p>Treating carbon sources with chemical agents and in situ doping using nitrogen-containing precursors.</p> Signup and view all the answers

What is the purpose of using melamine in the synthesis of nitrogen-doped carbon sheets?

<p>Melamine is used as a nitrogen source in the synthesis of nitrogen-doped carbon sheets.</p> Signup and view all the answers

What is the specific surface area of the resulting carbon sheets?

<p>The resulting carbon sheets have a specific surface area of 1997.5 m^2 g^-1.</p> Signup and view all the answers

What is the mass ratio of glucose to melamine in the synthesis of N-doped carbon sheets?

<p>The mass ratio of glucose to melamine in the synthesis of N-doped carbon sheets is 1:1.</p> Signup and view all the answers

What is the heating rate during the synthesis of N-doped carbon sheets?

<p>The heating rate during the synthesis of N-doped carbon sheets is 4 °C min^-1.</p> Signup and view all the answers

What is the formula to calculate the specific energy density (E) for a symmetric supercapacitor?

<p>E = \frac{1}{2} CV^2</p> Signup and view all the answers

How is the specific power density (P) calculated?

<p>P = E \cdot t</p> Signup and view all the answers

What are the equations used to calculate the gravimetric specific capacitance in a three-electrode system?

<p>C = \frac{I \cdot \Delta t}{m \cdot \Delta V} and C = \frac{m \cdot V \cdot I}{\Delta t \cdot \Delta V}</p> Signup and view all the answers

What is the equation to calculate the gravimetric specific capacitance for a single electrode in a two-electrode system?

<p>Cs = \frac{4I \cdot \Delta t}{m \cdot \Delta V}</p> Signup and view all the answers

What is the characteristic peak observed in the Raman spectrum at approximately 1356 cm^-1?

<p>The peak corresponds to the D-band and suggests the presence of disordered carbon structure.</p> Signup and view all the answers

What does the intensity ratio of D and G bands (ID/IG) indicate?

<p>The intensity ratio of D and G bands (ID/IG) is calculated to be 0.92, indicating a low crystallinity of the obtained NACS.</p> Signup and view all the answers

What chemical elements can be detected from the EDX spectra?

<p>Three chemical elements of carbon, nitrogen, and oxygen can be detected.</p> Signup and view all the answers

What are the four different types of nitrogen functionalities observed in the high resolution N1s spectrum?

<p>The four different types of nitrogen functionalities observed in the high resolution N1s spectrum are pyridinic-N (N6) at 398.3 eV, pyrrolic-N (N-5) at 400.2 eV, quaternary-N (N-Q) at 401.4 eV, and pyridine-N-oxide (N-X) at 403.0 eV.</p> Signup and view all the answers

What is the specific capacitance of NACS at 0.5 A g^-1?

<p>312 F g^-1</p> Signup and view all the answers

What is the specific capacitance of NACS at 30 A g^-1?

<p>246 F g^-1</p> Signup and view all the answers

What are the reasons for the high specific capacitance and excellent rate performance of NACS?

<ol> <li>The sheet-like morphology provides a large exposed area to electrolytes and a short diffusion distance for electrolyte ions into the inner pore walls. 2) The hierarchical micro/mesoporous structure with high specific surface area, microporous volume, and uniform pore size distribution could accelerate ion transport process within the pore channels and provide abundant inner surface regions for ion accumulation. 3) Doping nitrogen groups increase the surface wetting characters, improve the conductivity of carbon materials, and introduce extra pseudocapacitance, thus further enhancing the capacity performance.</li> </ol> Signup and view all the answers

What is the equation that relates energy density (E) and voltage window (V)?

<p>E = 0.5CV^2</p> Signup and view all the answers

What is the equation that describes the relation between capacitance (C) and specific surface area (A)?

<p>C = \frac{Q},{V} = \frac{nF},{m} = \frac{m},{V}</p> Signup and view all the answers

What is the abbreviation used for the journal?

<p>NACS</p> Signup and view all the answers

What is the potential application of ANN technology in material science?

<p>Analyzing complex variables and predicting the capacitive properties of carbon-based supercapacitors.</p> Signup and view all the answers

What is the method used to synthesize N-doped activated carbon sheets (NACS)?

<p>melamine-assisted chemical blowing method</p> Signup and view all the answers

What are the characteristics of the NACS material?

<p>hierarchical porous structure, high nitrogen content, high specific capacitance (312 F g^-1), and good rate performance</p> Signup and view all the answers

What is the energy density of the NACS supercapacitor?

<p>20.2 Wh kg^-1 at 448 W kg^-1</p> Signup and view all the answers

What is the nitrogen content of the NACS material?

<p>3</p> Signup and view all the answers

What is the purpose of the chemical blowing process in the formation of NACS?

<p>The purpose of the chemical blowing process is to blow the melted glucose to form sheet-like precursors, together with doping nitrogen element.</p> Signup and view all the answers

What is the effect of KOH chemical activation on the sheet-like morphology of NACS?

<p>The KOH chemical activation results in the decrease in thickness of sheets and the formation of numerous wrinkles on NACS.</p> Signup and view all the answers

What type of isotherm does the NACS material exhibit?

<p>The NACS material exhibits a type I isotherm due to the large N2 adsorption quantity in the low pressure region.</p> Signup and view all the answers

What are the textural parameters of the NACS material?

<p>The specific surface area (SBET) of NACS is 1997.5 m2 g^-1, the micropore surface area (Smicropore) is 1220.9 m2 g^-1, the mesopore surface area (Smesopore) is 776.6 m2 g^-1, the total pore volume (Vtotal) is 0.94 cm3 g^-1, and the average pore diameter (Dp) is 2.73 nm.</p> Signup and view all the answers

Flashcards are hidden until you start studying

Related Documents

Artificial Neural Network Enabled Capacitance Prediction for Carbon-Based Supercapacitors PDF
Melamine-Assisted Chemical Blowing Synthesis of N-doped Activated Carbon Sheets for Supercapacitors (2016) PDF

More Like This

Materials Science Quiz
3 questions

Materials Science Quiz

NavigableForethought avatar
NavigableForethought
Dental Materials Science Quiz
35 questions

Dental Materials Science Quiz

SuperiorAntigorite4686 avatar
SuperiorAntigorite4686
Materials Science and Engineering Quiz
5 questions

Material Science and Engineering Quiz: Test Your Knowledge

WittyOstrich avatar
WittyOstrich
Materials Science and Engineering Importance
24 questions

Materials Science and Engineering Importance

RecommendedXenon avatar
RecommendedXenon
Use Quizgecko on...
Browser
Open
Browser
Browser