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Study of electrochemical redox processes of a electrochemical system (direct methanol fuel cell) using cyclic voltammetry

Study of electrochemical redox processes of a electrochemical system (direct methanol fuel cell) using cyclic voltammetry / Tan Jun Ying
Dalam tahun-tahun kebelakangan ini, sel bahan methanol (DMFC) adalah teknologi yang baru muncul sebagai tenaga alternatif bagi menampung bekalan bahan api fosil yang kian menurun. Fungsi DMFC adalah penukaran tenaga kimia daripada metanol kepada tenaga elektrik melalui tindak balas pengurangan dan pengoksidaan antara metanol dan oksigen. Dalam kajian ini, voltammetri berkitar (CV) digunakan untuk mengkaji sifat-sifat elektrokimia DMFC. kadar imbasan yang berbeza telah digunakan untuk percubaan CV. Ia telah mendapati bahawa kadar imbasan menjejaskan pengeluaran arus dari anod. Apabila kadar imbasan CV eksperimen meningkat, arus dihasilkan oleh anod juga meningkat. Arus tertinggi dihasilkan daripada kadar imbasan 25mV / s mencatatkan pada 4.72 × 103 mA. Dengan menggunakan data yang diperoleh daripada eksperimen untuk pengiraan menggunakan Nicholson dan Teori Shain, nilai kadar heterogen berterusan standard, ko ialah 5.35226 cm / s. Data eksperimen yang dikumpul daripada eksperimen CV juga telah dicadangkan. Model yang digunakan adalah voltammetri berkitar model 1D. Model boleh digunakan untuk meramalkan voltammetri berkitar untuk kepekatan berbeza larutan metanol dan kadar imbasan yang berbeza CV, kerana kepekatan metanol dan mengimbas kadar adalah penting kepada generasi arus DMFC. Perbandingan telah dibuat antara voltammogram yang dicadangkan dan voltammogram didapati daripada eksperimen. _______________________________________________________________________________________________________ In recent years, direct methanol fuel cell (DMFC) is an emergent technology as an alternative energy to replace the declining supply of fossil fuels. DMFC functions by converting the chemical energy from methanol into electrical energy through the reduction and oxidation reaction between methanol and oxygen. In this study, cyclic voltammetry (CV) is used to study the electrochemical properties of DMFC. Different scan rates were used for the CV experiment. It was found out that the scans rates affect the current output by the anode. As the scans rates of the CV experiment increases, the current produced by the anode also increases. The highest current produced from the scan rate of 25mV/s was recorded at 4.72 × 103 mA. Using the data collected from the experiment for calculation using Nicholson and Shain Theory, the value of the standard heterogeneous rate constant, k0, 5.35226 cm/s. The experimental data collected from the CV experiment were also proposed into a model. The model used is cyclic voltammetry 1D model. The models can be used to predict cyclic voltammetry for different concentration of methanol solution and different scan rates of CV, as concentration of methanol and scan rates are important towards current generation of DMFC. Comparisons were made between the proposed voltammogram and the experimental voltammogram.
Contributor(s):
Tan Jun Ying - Author
Primary Item Type:
Final Year Project
Identifiers:
Accession Number : 875006364
Barcode : 00003103793
Language:
English
Subject Keywords:
direct methanol fuel cell (DMFC); emergent technology; alternative energy
First presented to the public:
6/1/2016
Original Publication Date:
5/21/2018
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Chemical Engineering
Citation:
Extents:
Number of Pages - 44
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2018-05-21 17:26:33.377
Date Last Updated
2019-01-07 11:24:32.9118
Submitter:
Mohd Jasnizam Mohd Salleh

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