Home
Add
Get on Google Play
Home
> Edit
Add/Update Thesis
Title*
Author's Name*
Supervisor's Name
Abstract
Nitrogen doped carbon materials (NDCMs) have been successfully synthesized, characterized and investigated as an electrode material for supercapacitor application. The synthesized NDCMs exhibited remarkable capacitor performance in terms of specific capacitances, rate capability, % capacitance retention and long cycle stability in a variety of aqueous electrolytes. Firstly, organic ionic dyes namely; eriochrome black-T (EBT) and murexide (MDE) were employed as N-rich precursors for the synthesis of NDCMs via a facile high temperature carbonization route. The effect of different experimental parameters such as heating profile, annealing temperature, post chemical activation and inert atmosphere was investigated in detail on NDCMs derived from EBT. Later, waste biopolymer; chicken feathers (CFs) were used as a low cost versatile N-rich precursor for the synthesis of NDCMs. Prior to carbonization, the thermogravimetric analysis (TGA) of all precursors was performed to evaluate the yield of carbon residue. The synthesized NDCMs were characterized by Raman analysis (RA), X-ray diffraction (XRD), surface area and porosity analysis (BET and BJH), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS). Afterwards, supercapacitor performance evaluation, electroanalytical techniques viz. cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) were performed. After detailed physicochemical investigation of NDCMs, it was established that these NDCMs have achieved good graphitization, amorphous/crystalline phases coexistence, homogeneous distribution of nitrogen and oxygen, three different types of nitrogen configurations (pyridinic N- 6, pyrrolic N-5 and quaternary N-Q), porous sheet like morphology, and moderate surface area with hierarchical porosity (micro, meso and macroporosity). The electrochemical investigations in acidic (1.0 M H2SO4), alkaline (6.0 M KOH) and neutral (0.5 M Na2SO4) electrolytes revealed that acidic electrolyte 1.0 M H2SO4 was the most promising electrolyte for supercapacitor application because of its small ion-size and high mobility which provide pseudocapacitive contribution. Whereas, among different alkali metal sulfate solutions (Li2SO4, Na2SO4, K2SO4) studied as an electrolyte for supercapacitor study of synthesized NDCMs, Li2SO4 proved to be a good choice. In addition, among the four different concentrations of Li2SO4 (0.5 M, 1.0 M, 1.5 M and 2.5 M), the optimized concentration for supercapacitor study of NCM(CF)-700A electrode material was found to be 1.5 M Li2SO4 due to its neutral character and large hydrated Li ion size associated with low mobility. Moreover, the operational voltage window for NCM(CF)-700A material was successfully extended up to 2.0 V in 1.5 M Li2SO4 solution.
Subject/Specialization
Language
Program
Faculty/Department's Name
Institute Name
Univeristy Type
Public
Private
Campus (if any)
Institute Affiliation Inforamtion (if any)
City where institute is located
Province
Country
Degree Starting Year
Degree Completion Year
Year of Viva Voce Exam
Thesis Completion Year
Thesis Status
Completed
Incomplete
Number of Pages
Urdu Keywords
English Keywords
Link
Select Category
Religious Studies
Social Sciences & Humanities
Science
Technology
Any other inforamtion you want to share such as Table of Contents, Conclusion.
Your email address*