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Nanoporous gold membranes: From morp...

Ding, Yi.

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Nanoporous gold membranes: From morphological control to fuel cell catalysis.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Nanoporous gold membranes: From morphological control to fuel cell catalysis./
作者:	Ding, Yi.
面頁冊數:	148 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-04, Section: B, page: 2260.
Contained By:	Dissertation Abstracts International66-04B.
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3172584
ISBN:	0542100908

Nanoporous gold membranes: From morphological control to fuel cell catalysis.
Ding, Yi.

Nanoporous gold membranes: From morphological control to fuel cell catalysis. - 148 p.

Source: Dissertation Abstracts International, Volume: 66-04, Section: B, page: 2260.

Thesis (Ph.D.)--The Johns Hopkins University, 2005.

Porous noble metals are particularly attractive for scientific research and industrial applications such as catalysis, sensing, and filtration. In this thesis, I will discuss the fabrication, characterization, and application of a new class of porous metals, called nanoporous metals (NPM).

ISBN: 0542100908Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Nanoporous gold membranes: From morphological control to fuel cell catalysis.
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245 1 0 $a Nanoporous gold membranes: From morphological control to fuel cell catalysis.
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500 $a Source: Dissertation Abstracts International, Volume: 66-04, Section: B, page: 2260.
500 $a Adviser: Jonah Erlebacher.
502 $a Thesis (Ph.D.)--The Johns Hopkins University, 2005.
520 $a Porous noble metals are particularly attractive for scientific research and industrial applications such as catalysis, sensing, and filtration. In this thesis, I will discuss the fabrication, characterization, and application of a new class of porous metals, called nanoporous metals (NPM).
520 $a NPM is made during selective dissolution (also called dealloying) of reactive components (e.g., silver) from multi-component alloys (e.g., Ag/Au alloy). Commercially available white gold leaf (Ag65Au35) can, for example, be etched into nanoporous gold (NPG) membrane by simply floating the leaf on concentrated nitric acid for periods of a few minutes. NPG leaf adopts a single crystal porous structure within individual grains. The microstructure of NPG, such as the pore size, is tunable between a few nanometers to sub-micron length scale by either thermal annealing or post-treatment in nitric acid for extended period of time.
520 $a A new gas-liquid-solid interface electroless plating technique is developed to uniformly cover the NPG surface with other metals, such as silver and platinum. This technique allows new opportunities of making functionalized nanostructures. We show that a combination of silver plating and dealloying can be used to make multimodal porous metals, which are expected to have application in sensing field.
520 $a Electroless platinum plating onto NPG shows very usual growth mode. TEM observation indicates that the platinum layer on NPG surface takes a novel form of layer-islanding growth (Stranski-Krastanov growth). Annealing the Pt/NPG composite smoothens the Pt islands and forms a 1 nm coherent Pt layer on the NPG backbone, possibly with dislocation formation at the Pt/Au interface. Furthermore, it was found that we could dissolve the gold away in aqueous gold etchant, leaving behind the 1 nm-thick Pt shell, a structure we call nanotubular mesoporous platinum (NMP).
520 $a Pt plated NPG has a series of unique structural properties, such as high active surface area, thermally stable, low Pt usage, and better tolerance to CO poisoning. We incorporated it as a membrane electrode into a working proton exchange membrane fuel cells (PEMFC). Preliminary results show that Pt/NPG has very good fuel cell performance at a very low platinum loading.
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790 1 0 $a Erlebacher, Jonah, $e advisor
790 $a 0098
791 $a Ph.D.
792 $a 2005
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