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Search Publications by: Gery R. Stafford (Assoc)

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Displaying 1 - 25 of 151

Dealloyed Pt74Ni26 and Pt26Ni74 Electrodeposited Thin Film Electrocatalysts for Oxygen Reduction

May 30, 2024
Author(s)
Carlos Hangarter, Eric Rus, Yihua Liu, Jaw Wook Shin, Vladimir Oleshko, Hyun Wook Ro, Russell Composto, Christopher Soles, Joseph A. Dura, Gery R. Stafford, Leonid Bendersky, Thomas P. Moffat
Pt100-xNix alloys are among the most active binary alloys for electrocatalysis of the oxygen reduction reaction (ORR) in PEM fuel cells. Electrodeposition and microstructure of thin films close to Pt75Ni25 and Pt25Ni75 stoichiometry are described and their

In-situ Stress Measurements During CO Adsorption onto Pt

February 24, 2022
Author(s)
David Raciti, Gery R. Stafford, Kathleen Schwarz, John Vinson
The change in surface stress associated with the adsorption and oxidative stripping of carbon monoxide (CO) on (111)-textured Pt is examined using the wafer curvature method in 0.1 M KHCO3 electrolyte. The curvature of the Pt cantilever electrode was

In-situ Stress Measurements During Cobalt Electrodeposition

January 12, 2019
Author(s)
Gery R. Stafford, Ugo Bertocci
In situ cantilever curvature is used to quantify the growth stress in Co thin films, electrodeposited from an electrolyte consisting of 0.5 mol/L Na2SO4, 0.5 mol/L H3BO3, and 0.1 mol/L CoSO4 . 7 H20. The average biaxial steady-state stress is measured as a

Mechanical response of thermally annealed Nafion thin films

December 7, 2016
Author(s)
Bradley R. Frieberg, Kirt A. Page, Joshua R. Graybill, Marlon L. Walker, Gery R. Stafford, Christopher L. Soles
The proton exchange membranes (PEMs) in a hydrogen fuel cell experiences hundreds if not thousands of cycles between wet and dry conditions during their service life, which leads to swelling and shrinking of the membrane material. This can lead to

In-situ Stress Measurements During Cobalt Electrodeposition on (111)-Textured Au

April 14, 2016
Author(s)
Gery R. Stafford, Matthew R. Fayette, Ugo Bertocci
Cantilever curvature was used to examine stress generation during the electrodeposition of Co from 0.1 M NaClO4 + 0.001 M Co(ClO4)2 (pH = 4.8) in films measuring less than 100 nm in thickness. The stress-thickness product showed a -0.2 N/m compression in

Electrodeposition of Al-W-Mn Ternary Alloys from the Lewis Acidic Aluminum Chloride?1-Ethyl-3-methylimidazolium Chloride Ionic Liquid

November 16, 2015
Author(s)
Gery R. Stafford, Tetsuya Tsuda, Yuichi Ikeda, Akihito Imanishi, Shohei Kusumoto, Sudsumu Kuwabata, Charles Hussey
The electrodeposition of non-equilibrium ternary Al-W-Mn alloys was examined in the Lewis acidic 66.7-33.3 mole ratio aluminum chloride–1-ethyl-3-methylimidazolium chloride (AlCl3–[C2mim]Cl) ionic liquid (IL). K3[W2Cl9] and MnCl2 were added to provide

Stress in Aluminum Induced by Hydrogen Absorption during Cathodic Polarization

September 16, 2015
Author(s)
Gery R. Stafford, Jae W. Shin, Kurt Hebert
The hydrogen concentration in metals during aqueous corrosion is influenced by the kinetics of hydrogen absorption. Measurements of absorption kinetics are challenged by competing gas evolution and corrosion processes. However, in situ measurements of

In-Situ Method for Measuring the Mechanical Properties of Nafion Thin Films during Hydration Cycles

August 15, 2015
Author(s)
Kirt A. Page, Jae W. Shin, Scott Eastman, Brandon W. Rowe, Sangcheol Kim, Ahmet Kusoglu, Kevin G. Yager, Gery R. Stafford
Perfluorinated ionomers, in particular Nafion, are an essential component in hydrogen fuel cells, as both the proton exchange membrane and the binder within the catalyst layer. During normal operation of a hydrogen fuel cell the ionomer will progressively