Effects of ionomer morphology on oxygen reduction on Pt

Chlistunoff, Jerzy; Pivovar, Bryan

doi:10.1149/2.0661508jes

Title: Effects of ionomer morphology on oxygen reduction on Pt

Journal Article · Thu May 21 00:00:00 EDT 2015 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.0661508jes· OSTI ID:1220680

Chlistunoff, Jerzy ^[1]; Pivovar, Bryan ^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)

The oxygen reduction reaction (ORR) at the interface between platinum and Nafion 1100 equivalent weight was studied as a function of temperature (20–80 °C), humidity (10–100%), scan rate, the manner in which Nafion film was deposited, and the state of the Pt surface using ultramicroelectrodes employing cyclic voltammetry and chronoamperometry. ORR on smooth electrodes was strongly inhibited under specific conditions dependent on temperature, humidity, and scan rate. From the data presented, we postulate that dynamic changes in the molecular structure of the ionomer at the platinum interface result in differences in ORR voltammetry for films prepared and equilibrated under different conditions. The lack of similar changes for rough, platinized electrodes has been attributed to differences in initial ionomer structure and a higher energy barrier for ionomer restructuring. As a result, these model system studies yield insight into the ionomer-catalyst interface of particular interest for polymer electrolyte fuel cells.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC36-08GO28308; AC52-06NA25396

OSTI ID:: 1220680

Alternate ID(s):: OSTI ID: 1321757

Report Number(s):: NREL/JA-5900-63733; LA-UR-15-22418

Journal Information:: Journal of the Electrochemical Society, Vol. 162, Issue 8; Related Information: Journal of the Electrochemical Society; ISSN 0013-4651

Publisher:: The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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Title: Effects of ionomer morphology on oxygen reduction on Pt

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