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Pt/Ceria-based Catalysts for Small A...

Menendez-Mora, Christian L.

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Pt/Ceria-based Catalysts for Small Alcohol Electrooxidation.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Pt/Ceria-based Catalysts for Small Alcohol Electrooxidation./
作者:	Menendez-Mora, Christian L.
面頁冊數:	146 p.
附註:	Source: Dissertation Abstracts International, Volume: 75-10(E), Section: B.
Contained By:	Dissertation Abstracts International75-10B(E).
標題:	Inorganic chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3622246
ISBN:	9781303938849

Pt/Ceria-based Catalysts for Small Alcohol Electrooxidation.
Menendez-Mora, Christian L.

Pt/Ceria-based Catalysts for Small Alcohol Electrooxidation. - 146 p.

Source: Dissertation Abstracts International, Volume: 75-10(E), Section: B.

Thesis (Ph.D.)--University of Puerto Rico, Rio Piedras (Puerto Rico), 2014.

High emissions of fossil-based energy sources have led to scientists around the world to develop new alternatives for the future. In this sense, fuel cells are a remarkable and promising energy option with less environmental impact. The most used fuels for this technology are hydrogen and small chain alcohols, which can be oxidized to transform their chemical energy into electrical power. To do this, fuel cells need catalysts that will act as an active surface where the oxidation can take place. The problem with platinum catalysts is its possible CO poisoning with intermediates that are produced before the complete oxidation of alcohol to CO2. Different approaches have been taken to try to resolve this issue. In this case, cerium oxide (ceria) was selected as a co-catalyst to mitigate the effect of CO poisoning of platinum. Ceria is a compound that has the ability to work as an "oxygen tank" and can donate oxygen to carbon monoxide that is strongly adsorbed at platinum surface to produce CO2 (carbon dioxide), regenerating the Pt surface for further alcohol oxidation. Therefore, enhancing the current density as well as the power output of a fuel cell.

ISBN: 9781303938849Subjects--Topical Terms:

3173556
Inorganic chemistry.

Pt/Ceria-based Catalysts for Small Alcohol Electrooxidation.
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100 1 $a Menendez-Mora, Christian L. $3 3188369
245 1 0 $a Pt/Ceria-based Catalysts for Small Alcohol Electrooxidation.
300 $a 146 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-10(E), Section: B.
500 $a Adviser: Carlos R. Cabrera.
502 $a Thesis (Ph.D.)--University of Puerto Rico, Rio Piedras (Puerto Rico), 2014.
520 $a High emissions of fossil-based energy sources have led to scientists around the world to develop new alternatives for the future. In this sense, fuel cells are a remarkable and promising energy option with less environmental impact. The most used fuels for this technology are hydrogen and small chain alcohols, which can be oxidized to transform their chemical energy into electrical power. To do this, fuel cells need catalysts that will act as an active surface where the oxidation can take place. The problem with platinum catalysts is its possible CO poisoning with intermediates that are produced before the complete oxidation of alcohol to CO2. Different approaches have been taken to try to resolve this issue. In this case, cerium oxide (ceria) was selected as a co-catalyst to mitigate the effect of CO poisoning of platinum. Ceria is a compound that has the ability to work as an "oxygen tank" and can donate oxygen to carbon monoxide that is strongly adsorbed at platinum surface to produce CO2 (carbon dioxide), regenerating the Pt surface for further alcohol oxidation. Therefore, enhancing the current density as well as the power output of a fuel cell.
520 $a First, an occlusion deposition technique was used to prepare platinum/ceria composite electrodes and tested them towards small chain alcohol oxidation such as methanol oxidation reaction in acidic and alkaline media. The preliminary results demonstrated that the Pt/ceria electrodes were more efficient towards methanol electrooxidation when compared to Pt electrodes. This enhancement was attributed to the presence of ceria.
520 $a A second preparation method was selected for the synthesis of ceria/Pt catalysts. In this case, a hydrothermal method was used and the catalysis were studied for the effect of MeOH, EtOH and n-BuOH oxidation. The observed effect was that electrodes made of Pt/Pt:CeO2-x showed better catalytic effect than Pt/ceria and platinum electrodes. Moreover, a comparison between ceria nanorods versus nanoparticles as substrates was done. The general result was that ceria nanoparticles showed better electrocatalytic behavior towards the oxidation of methanol in alkaline medium.
520 $a Finally, as an outreach activity, an educational module to reinforce the electrochemical concepts in the General Chemistry Laboratory course at UPR-RP was developed. The module was based on Volta's Experiment and an improvement on students learning was detected when comparing this activity with the normal Daniel's cell experience that is used in most Universities at the undergraduate level.
520 $a In summary, the findings of this thesis conclude that ceria is a compound that may enhance platinum catalytic activity by CO oxidation, promoting the oxidation of alcohols in acidic and alkaline medium. Moreover, catalysis depends on the morphology of the ceria that is used as the catalysts support.
590 $a School code: 0281.
650 4 $a Inorganic chemistry. $3 3173556
650 4 $a Nanotechnology. $3 526235
690 $a 0488
690 $a 0652
710 2 $a University of Puerto Rico, Rio Piedras (Puerto Rico). $b Chemistry. $3 1679881
773 0 $t Dissertation Abstracts International $g 75-10B(E).
790 $a 0281
791 $a Ph.D.
792 $a 2014
793 $a English
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