Operando X-ray absorption and infrared fuel cell spectroscopy

被引：24
作者：
Lewis, Emily A. [1 ]
Kendrick, Ian [1 ]
Jia, Qingying [2 ]
Grice, Corey [3 ]
Segre, Carlo U. [2 ]
Smotkin, Eugene S. [1 ]
机构：
[1] Northeastern Univ, Dept Chem & Chem Biol, Boston, MA 02115 USA
[2] IIT, Div Phys, Dept Biol Chem & Phys Sci, Chicago, IL 60616 USA
[3] NuVant Syst Inc, Crown Point, IN 46307 USA
来源：
ELECTROCHIMICA ACTA | 2011年 / 56卷 / 24期
关键词：
Fuel cell; Membrane electrode assembly; Operando spectroscopy; X-ray absorption spectroscopy; Infrared spectroscopy; Stark tuning; Platinum; Nickel; XANES; ION-EXCHANGE; ADSORPTION SITES; ADSORBED CO; METHANOL; PTRU; NAFION; ELECTRODES; OXIDATION; SURFACE; PHASE;
D O I：
10.1016/j.electacta.2011.07.091
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
A polymer electrolyte fuel cell enables operando X-ray absorption and infrared spectroscopy of the membrane electrode assembly catalytic layer with flowing fuel and air streams at controlled temperature. Time-dependent X-ray absorption near edge structure spectra of the Pt and Ni edge of Pt based catalysts of an air-breathing cathode show that catalyst restructuring, after a potential step, has time constants from minutes to hours. The infrared Stark tuning plots of CO adsorbed on Pt at 100, 200, 300 and 400 mV vs. hydrogen reference electrode were obtained. The Stark tuning plots of CO adsorbed at 400 mV exhibit a precipitous drop in frequency coincident with the adsorption potential. The turn-down potential decreases relative to the adsorption potential and is approximately constant after 300 mV. These Stark tuning characteristics are attributed to potential dependent adsorption site selection by CO and competitive adsorption processes. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：8827 / 8832
页数：6
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