Electrochemical and Raman spectroscopic evaluation of Pt/graphitized carbon black catalyst durability for the start/stop operating condition of polymer electrolyte fuel cells

Masanori Hara, Myoungseok Lee, Cheng Hong Liu, Bing Hung Chen, Yuya Yamashita, Makoto Uchida, Hiroyuki Uchida, Masahiro Watanabe

研究成果: Article

80 引文 (Scopus)

摘要

The durability of Pt nanoparticle catalysts and two types of carbon supports, carbon black (CB) and graphitized carbon black (GCB), for 50 wt% Pt-loaded catalysts (commercial Pt/CB, and Pt/GCB, heat treated (HT) Pt/GCB, and an in-house-prepared nanocapsule Pt/GCB) was evaluated by electrochemical and Raman spectroscopic methods. The Pt-loaded carbon catalysts were tested by means of a standard potential step protocol (0.9 V ↔ 1.3 V vs. RHE, holding 30 s at each potential and taking 1 min for one cycle, 3000 potential cycles for commercial Pt/CB and 10,000 cycles for commercial Pt/GCB, Pt/GCB-HT, and nanocapsule Pt/GCB) in membrane-electrode assemblies at 65 °C with 100% RH H 2 (anode) and N 2 (cathode). Slower degradation of the electrochemically active surface area (ECA) and smaller mass activity losses before vs. after durability testing for Pt/GCB compared to CB revealed the higher corrosion resistance of GCB. Changes in the Raman spectra were clearly detected between the Pt/GCB catalyst before and after durability testing, while only slight differences of spectra were found for commercial Pt/CB during durability testing. The degradation degree of the graphitized carbon black support was successfully evaluated from changes in the band area ratio of the G band (ca. 1575 cm -1) to the D1 band (ca. 1325 cm -1), which were estimated from curve fitting of the spectra. It was found that the type of support material, Pt nanoparticle size, as well as its dispersion state on the support, affected the degradation properties of the catalysts. The results of the Raman spectroscopic measurements demonstrated the applicability of this technique for the evaluation of the state of the graphitized carbon black-supported Pt catalysts.

原文English
頁(從 - 到)171-181
頁數11
期刊Electrochimica Acta
70
DOIs
出版狀態Published - 2012 五月 30

指紋

Soot
Carbon black
Electrolytes
Fuel cells
Polymers
Durability
Catalysts
Catalyst supports
Nanocapsules
Degradation
Testing
Carbon
Nanoparticles

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

引用此文

Hara, Masanori ; Lee, Myoungseok ; Liu, Cheng Hong ; Chen, Bing Hung ; Yamashita, Yuya ; Uchida, Makoto ; Uchida, Hiroyuki ; Watanabe, Masahiro. / Electrochemical and Raman spectroscopic evaluation of Pt/graphitized carbon black catalyst durability for the start/stop operating condition of polymer electrolyte fuel cells. 於: Electrochimica Acta. 2012 ; 卷 70. 頁 171-181.
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title = "Electrochemical and Raman spectroscopic evaluation of Pt/graphitized carbon black catalyst durability for the start/stop operating condition of polymer electrolyte fuel cells",
abstract = "The durability of Pt nanoparticle catalysts and two types of carbon supports, carbon black (CB) and graphitized carbon black (GCB), for 50 wt{\%} Pt-loaded catalysts (commercial Pt/CB, and Pt/GCB, heat treated (HT) Pt/GCB, and an in-house-prepared nanocapsule Pt/GCB) was evaluated by electrochemical and Raman spectroscopic methods. The Pt-loaded carbon catalysts were tested by means of a standard potential step protocol (0.9 V ↔ 1.3 V vs. RHE, holding 30 s at each potential and taking 1 min for one cycle, 3000 potential cycles for commercial Pt/CB and 10,000 cycles for commercial Pt/GCB, Pt/GCB-HT, and nanocapsule Pt/GCB) in membrane-electrode assemblies at 65 °C with 100{\%} RH H 2 (anode) and N 2 (cathode). Slower degradation of the electrochemically active surface area (ECA) and smaller mass activity losses before vs. after durability testing for Pt/GCB compared to CB revealed the higher corrosion resistance of GCB. Changes in the Raman spectra were clearly detected between the Pt/GCB catalyst before and after durability testing, while only slight differences of spectra were found for commercial Pt/CB during durability testing. The degradation degree of the graphitized carbon black support was successfully evaluated from changes in the band area ratio of the G band (ca. 1575 cm -1) to the D1 band (ca. 1325 cm -1), which were estimated from curve fitting of the spectra. It was found that the type of support material, Pt nanoparticle size, as well as its dispersion state on the support, affected the degradation properties of the catalysts. The results of the Raman spectroscopic measurements demonstrated the applicability of this technique for the evaluation of the state of the graphitized carbon black-supported Pt catalysts.",
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Electrochemical and Raman spectroscopic evaluation of Pt/graphitized carbon black catalyst durability for the start/stop operating condition of polymer electrolyte fuel cells. / Hara, Masanori; Lee, Myoungseok; Liu, Cheng Hong; Chen, Bing Hung; Yamashita, Yuya; Uchida, Makoto; Uchida, Hiroyuki; Watanabe, Masahiro.

於: Electrochimica Acta, 卷 70, 30.05.2012, p. 171-181.

研究成果: Article

TY - JOUR

T1 - Electrochemical and Raman spectroscopic evaluation of Pt/graphitized carbon black catalyst durability for the start/stop operating condition of polymer electrolyte fuel cells

AU - Hara, Masanori

AU - Lee, Myoungseok

AU - Liu, Cheng Hong

AU - Chen, Bing Hung

AU - Yamashita, Yuya

AU - Uchida, Makoto

AU - Uchida, Hiroyuki

AU - Watanabe, Masahiro

PY - 2012/5/30

Y1 - 2012/5/30

N2 - The durability of Pt nanoparticle catalysts and two types of carbon supports, carbon black (CB) and graphitized carbon black (GCB), for 50 wt% Pt-loaded catalysts (commercial Pt/CB, and Pt/GCB, heat treated (HT) Pt/GCB, and an in-house-prepared nanocapsule Pt/GCB) was evaluated by electrochemical and Raman spectroscopic methods. The Pt-loaded carbon catalysts were tested by means of a standard potential step protocol (0.9 V ↔ 1.3 V vs. RHE, holding 30 s at each potential and taking 1 min for one cycle, 3000 potential cycles for commercial Pt/CB and 10,000 cycles for commercial Pt/GCB, Pt/GCB-HT, and nanocapsule Pt/GCB) in membrane-electrode assemblies at 65 °C with 100% RH H 2 (anode) and N 2 (cathode). Slower degradation of the electrochemically active surface area (ECA) and smaller mass activity losses before vs. after durability testing for Pt/GCB compared to CB revealed the higher corrosion resistance of GCB. Changes in the Raman spectra were clearly detected between the Pt/GCB catalyst before and after durability testing, while only slight differences of spectra were found for commercial Pt/CB during durability testing. The degradation degree of the graphitized carbon black support was successfully evaluated from changes in the band area ratio of the G band (ca. 1575 cm -1) to the D1 band (ca. 1325 cm -1), which were estimated from curve fitting of the spectra. It was found that the type of support material, Pt nanoparticle size, as well as its dispersion state on the support, affected the degradation properties of the catalysts. The results of the Raman spectroscopic measurements demonstrated the applicability of this technique for the evaluation of the state of the graphitized carbon black-supported Pt catalysts.

AB - The durability of Pt nanoparticle catalysts and two types of carbon supports, carbon black (CB) and graphitized carbon black (GCB), for 50 wt% Pt-loaded catalysts (commercial Pt/CB, and Pt/GCB, heat treated (HT) Pt/GCB, and an in-house-prepared nanocapsule Pt/GCB) was evaluated by electrochemical and Raman spectroscopic methods. The Pt-loaded carbon catalysts were tested by means of a standard potential step protocol (0.9 V ↔ 1.3 V vs. RHE, holding 30 s at each potential and taking 1 min for one cycle, 3000 potential cycles for commercial Pt/CB and 10,000 cycles for commercial Pt/GCB, Pt/GCB-HT, and nanocapsule Pt/GCB) in membrane-electrode assemblies at 65 °C with 100% RH H 2 (anode) and N 2 (cathode). Slower degradation of the electrochemically active surface area (ECA) and smaller mass activity losses before vs. after durability testing for Pt/GCB compared to CB revealed the higher corrosion resistance of GCB. Changes in the Raman spectra were clearly detected between the Pt/GCB catalyst before and after durability testing, while only slight differences of spectra were found for commercial Pt/CB during durability testing. The degradation degree of the graphitized carbon black support was successfully evaluated from changes in the band area ratio of the G band (ca. 1575 cm -1) to the D1 band (ca. 1325 cm -1), which were estimated from curve fitting of the spectra. It was found that the type of support material, Pt nanoparticle size, as well as its dispersion state on the support, affected the degradation properties of the catalysts. The results of the Raman spectroscopic measurements demonstrated the applicability of this technique for the evaluation of the state of the graphitized carbon black-supported Pt catalysts.

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