Electrochemical oxidation of methanol on platinum and platinum based electrodes

Bibliographic Details
Main Author:	Morimoto, Yu
Language:	English
Published:	Case Western Reserve University School of Graduate Studies / OhioLINK 1995
Subjects:	Electrochemical oxidation methanol platinum electrodes
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=case1058206604

id	ndltd-OhioLink-oai-etd.ohiolink.edu-case1058206604
record_format	oai_dc
spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-case10582066042021-08-03T05:31:04Z Electrochemical oxidation of methanol on platinum and platinum based electrodes Morimoto, Yu Electrochemical oxidation methanol platinum electrodes Fuel cells offer important advantages as a power source, such as the potential for high efficiency, clean exhaust gases and quiet operation. In addition, the direct methanol fuel cell offers special benefits as a power source for transportation, such as potential high energy density, no need for a fuel reformer and a quick response. These advantages, however, have not been fully realized yet. One of the problems is the poor performance of the fuel electrode. Even platinum, which seems the most active single element for methanol oxidation in acid media, loses its electrocatalytic activity rapidly by the accumulation of adsorbed partially oxidized products. It is essential to understand the mechanisms of methanol oxidation including the adsorbate formation and removal. To this purpose, the electrochemical oxidation of adsorbed carbon monoxide (COad) and methanol was studied using electrochemical and two spectroscopic techniques, in situ infrared spectroscopy and on-line mass spectroscopy. A direct path from methanol to CO<sub>2</sub> without COad as an intermediate was confirmed as well as a path involving COad. Under usual conditions, the direct path to CO<sub>2</sub> was found to be suppressed by the decrease in the active sites caused by accumulation of COad. Two types of COad were recognized. Most COad appeared to be oxidized using Pt-OH as the oxygen source (hoCOad: hard-to-oxidize COad). Some sites were also found, especially on high area platinum, to allow COad to be relatively easily oxidized directly using water as the oxygen source (eoCOad: easily oxidized COad). The accessibility of oxygen sources to COad was proposed as a key factor. The effects of temperature, types and concentrations of acids were studied. The highest catalytic activity was achieved at 100°C in 1 - 3 M sulfuric acid. Ruthenium on platinum was found to promote the oxidation of hoCOad while tin on platinum was found effective for eoCOad. Enhancement of the methanol oxidation to CO<sub>2</sub> was confirmed on platinum with either ruthenium or tin. Molybdates on platinum was also found to promote the oxidation of both eoCOad and methanol. On the basis of this study, future work is proposed. 1995 English text Case Western Reserve University School of Graduate Studies / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=case1058206604 http://rave.ohiolink.edu/etdc/view?acc_num=case1058206604 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	Electrochemical oxidation methanol platinum electrodes
spellingShingle	Electrochemical oxidation methanol platinum electrodes Morimoto, Yu Electrochemical oxidation of methanol on platinum and platinum based electrodes
author	Morimoto, Yu
author_facet	Morimoto, Yu
author_sort	Morimoto, Yu
title	Electrochemical oxidation of methanol on platinum and platinum based electrodes
title_short	Electrochemical oxidation of methanol on platinum and platinum based electrodes
title_full	Electrochemical oxidation of methanol on platinum and platinum based electrodes
title_fullStr	Electrochemical oxidation of methanol on platinum and platinum based electrodes
title_full_unstemmed	Electrochemical oxidation of methanol on platinum and platinum based electrodes
title_sort	electrochemical oxidation of methanol on platinum and platinum based electrodes
publisher	Case Western Reserve University School of Graduate Studies / OhioLINK
publishDate	1995
url	http://rave.ohiolink.edu/etdc/view?acc_num=case1058206604
work_keys_str_mv	AT morimotoyu electrochemicaloxidationofmethanolonplatinumandplatinumbasedelectrodes
_version_	1719421217655488512

Electrochemical oxidation of methanol on platinum and platinum based electrodes

Similar Items