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Understanding the electrochemical reduction of carbon dioxide into formate using a tin-plated cathode

Master of Science in Environmental Engineering

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Bibliographic Details
Main Author: Tan, Tiek aun
Other Authors: Sara Yasina, Yusuf, Dr.
Format: Thesis
Language:English
Published: Universiti Malaysia Perlis (UniMAP) 2016
Subjects:
Electrolytic reduction
Carbon dioxide
Formate
Cathode
Online Access:http://dspace.unimap.edu.my:80/xmlui/handle/123456789/77169
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spelling my.unimap-771692022-11-24T07:21:50Z Understanding the electrochemical reduction of carbon dioxide into formate using a tin-plated cathode Tan, Tiek aun Sara Yasina, Yusuf, Dr. Electrolytic reduction Carbon dioxide Formate Cathode Master of Science in Environmental Engineering Sn has been a research interest for its ability in converting CO2 into its reduced form very efficiently and at a relatively low energy cost. However, a complete and exhaustive study for the usage of Sn in electrochemical reduction of CO2 still does not exist. Researchers often provide conflicting reports on the role of variables such as cathodic CO2 transport or electrolyte pH. Cathode degradation also has been reported by various researchers in literature but however, disagreement as to the cause of the degradation exists. This thesis presents a fundamental study on the electrochemical reduction of CO2 into HCOO¯ HCOO¯ using a tin plated electrode. Sn was successfully deposited on glassy carbon electrode satisfactorily with a good even surface. The Sn plated electrodes are mechanically stable and give reproducible electrochemical characterizations. The produced Sn electrode is used to investigate the effects of cathode rotating speed, electrolyte pH, and applied cathode potential on the Faradaic efficiency for HCOO¯. A higher cathode rotating speed is detrimental to the HCOO¯ Faradaic efficiency. CO2 molecules entering the reactor have shorter residence time at higher cathode rotating speeds and some leave without undergoing electrochemical reaction. Basic conditions are preferable for CO2 reduction to HCOO¯. H2 evolution is prevalent at low pH due to the high amount of available [H+] to be reduced. HCO3¯ may have contributed as a precursor chemical for the formation of HCOO¯. The Faradaic efficiency for producing HCOO¯ increases until it tapers off to a maximum at -1.75 V vs SCE. When the potential is made negative further, the Faradaic efficiency decreasesdue to the enhancement of H2 evolution which is consistent with literature. The Sn plated electrode was found to degrade and strip off during electrochemical reduction likely due to mechanical stress caused by hydrogen embrittlement. When the electrolyte is basic, it is possible that when the Sn-CO2 is formed, the bond between the two does not always break afterwards and thecomplex is brought into the bulk electrolyte. Sn is a potential selective cathode material in electrochemically reducing CO2 into HCOO¯. The roles of several, select, important variables have been made clear for the benefit of future studies. Future studies will also be made aware of the Sn degradation with time during electrochemical reduction. 2016 2022-11-24T07:19:13Z 2022-11-24T07:19:13Z Thesis http://dspace.unimap.edu.my:80/xmlui/handle/123456789/77169 en Universiti Malaysia Perlis (UniMAP) Universiti Malaysia Perlis (UniMAP) School of Environmental Engineering
institution Universiti Malaysia Perlis
building UniMAP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Perlis
content_source UniMAP Library Digital Repository
url_provider http://dspace.unimap.edu.my/
language English
topic Electrolytic reduction
Carbon dioxide
Formate
Cathode
spellingShingle Electrolytic reduction
Carbon dioxide
Formate
Cathode
Tan, Tiek aun
Understanding the electrochemical reduction of carbon dioxide into formate using a tin-plated cathode
description Master of Science in Environmental Engineering
author2 Sara Yasina, Yusuf, Dr.
author_facet Sara Yasina, Yusuf, Dr.
Tan, Tiek aun
format Thesis
author Tan, Tiek aun
author_sort Tan, Tiek aun
title Understanding the electrochemical reduction of carbon dioxide into formate using a tin-plated cathode
title_short Understanding the electrochemical reduction of carbon dioxide into formate using a tin-plated cathode
title_full Understanding the electrochemical reduction of carbon dioxide into formate using a tin-plated cathode
title_fullStr Understanding the electrochemical reduction of carbon dioxide into formate using a tin-plated cathode
title_full_unstemmed Understanding the electrochemical reduction of carbon dioxide into formate using a tin-plated cathode
title_sort understanding the electrochemical reduction of carbon dioxide into formate using a tin-plated cathode
publisher Universiti Malaysia Perlis (UniMAP)
publishDate 2016
url http://dspace.unimap.edu.my:80/xmlui/handle/123456789/77169
_version_ 1753972990819696640
score 13.214268

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