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Sarkar, Arindam.

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Synthesis and characterization of nanostructured palladium-based alloy electrocatalysts.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Synthesis and characterization of nanostructured palladium-based alloy electrocatalysts./
Author:	Sarkar, Arindam.
Description:	180 p.
Notes:	Source: Dissertation Abstracts International, Volume: 70-09, Section: B, page: 5760.
Contained By:	Dissertation Abstracts International70-09B.
Subject:	Alternative Energy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3372647
ISBN:	9781109366563

Synthesis and characterization of nanostructured palladium-based alloy electrocatalysts.
Sarkar, Arindam.

Synthesis and characterization of nanostructured palladium-based alloy electrocatalysts. - 180 p.

Source: Dissertation Abstracts International, Volume: 70-09, Section: B, page: 5760.

Thesis (Ph.D.)--The University of Texas at Austin, 2009.

Low temperature fuel cells like proton exchange membrane fuel cells (PEMFC) are expected to play a crucial role in the future hydrogen economy, especially for transportation applications. These electrochemical devices offer significantly higher efficiency compared to conventional heat engines. However, use of exotic and expensive platinum as the electrocatalyst poses serious problems for commercial viability. In this regard, there is an urgent need to develop low-platinum or non-platinum electrocatalysts with electrocatalytic activity for the oxygen reduction reaction (ORR) superior or comparable to that of platinum.

ISBN: 9781109366563Subjects--Topical Terms:

1035473
Alternative Energy.

Synthesis and characterization of nanostructured palladium-based alloy electrocatalysts.
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020 $a 9781109366563
035 $a (UMI)AAI3372647
035 $a AAI3372647
040 $a UMI $c UMI
100 1 $a Sarkar, Arindam. $3 1669552
245 1 0 $a Synthesis and characterization of nanostructured palladium-based alloy electrocatalysts.
300 $a 180 p.
500 $a Source: Dissertation Abstracts International, Volume: 70-09, Section: B, page: 5760.
500 $a Adviser: Arumugam Manthiram.
502 $a Thesis (Ph.D.)--The University of Texas at Austin, 2009.
520 $a Low temperature fuel cells like proton exchange membrane fuel cells (PEMFC) are expected to play a crucial role in the future hydrogen economy, especially for transportation applications. These electrochemical devices offer significantly higher efficiency compared to conventional heat engines. However, use of exotic and expensive platinum as the electrocatalyst poses serious problems for commercial viability. In this regard, there is an urgent need to develop low-platinum or non-platinum electrocatalysts with electrocatalytic activity for the oxygen reduction reaction (ORR) superior or comparable to that of platinum.
520 $a This dissertation first investigates non-platinum, palladium-based alloy electrocatalysts for ORR. Particularly, Pd-M (M = Mo and W) alloys are synthesized by a novel thermal decomposition of organo-metallic precursors. The carbon-supported Pd-M (M = Mo, W) electrocatalyts are then heat treated up to 900°C in H2 atmosphere and investigated for their phase behavior. Cyclic voltammetry (CV) and rotating disk electrode (RDE) measurements reveal that the alloying of Pd with Mo or W significantly enhances the catalytic activity for ORR as well as the stability (durability) of the electrocatalysts. Additionally, both the alloy systems exhibit high tolerance to methanol, which is particularly advantageous for direct methanol fuel cells (DMFC).
520 $a The dissertation then focuses on one-pot synthesis of carbon-supported multi-metallic Pt-Pd-Co nanoalloys by a rapid microwave-assisted solvothermal (MW-ST) method. The multi-metallic alloy compositions synthesized by the MW-ST method show much higher catalytic activity for ORR compared to their counterparts synthesized by the conventional borohydride reduction method. Additionally, a series of Pt encapsulated Pd-Co nanoparticle electrocatalysts are synthesized by the MW-ST method and characterized to understand their phase behavior, surface composition, and electrocatalytic activity for ORR.
520 $a Finally, the dissertation focuses on carbon-supported binary Pt Cu and ternary PtxPd1-x Cu "core-shell" nanoparticles synthesized by a novel galvanic displacement of Cu by Pt4+ and Pd2+ at ambient conditions. Structural characterizations suggest that the Pt Cu nanoparticles have a Pt-Cu alloy layer sandwiched between a copper core and a Pt shell. The electrochemical data clearly point to an enhancement in the activity for ORR for the Pt Cu "core-shell" nanoparticle electrocatalysts compared to the commercial Pt electrocatalyst, both on per unit mass of Pt and per unit active surface area basis. The increase in activity for ORR is ascribed to electronic modification of the outer Pt shell by the Pt-Cu alloy core. However, incorporation of Pd to obtain Pt xPd1-x Cu deteriorates the activity for ORR.
590 $a School code: 0227.
650 4 $a Alternative Energy. $3 1035473
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0363
690 $a 0794
710 2 $a The University of Texas at Austin. $b Materials Science. $3 1669551
773 0 $t Dissertation Abstracts International $g 70-09B.
790 1 0 $a Manthiram, Arumugam, $e advisor
790 1 0 $a Ferreira, Paulo $e committee member
790 1 0 $a Wheat, Harovel G. $e committee member
790 1 0 $a Meyers, Jeremy P. $e committee member
790 1 0 $a Stevenson, Keith J. $e committee member
790 $a 0227
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3372647