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Kwak, Ja Hun
Molecular Catalysis lab
Research Interests
  • Heterogeneous catalysis, molecular catalysis, ASlumima, zeolites

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The influence of the electrochemical stressing (potential step and potential-static holding) on the degradation of polymer electrolyte membrane fuel cell electrocatalysts

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dc.contributor.author Shao, Yuyan ko
dc.contributor.author Kou, Rong ko
dc.contributor.author Wang, Jun ko
dc.contributor.author Viswanathan, Vilayanur V. ko
dc.contributor.author Kwak, Jahun ko
dc.contributor.author Liu, Jun ko
dc.contributor.author Wang, Yong ko
dc.contributor.author Lin, Yuehe ko
dc.date.available 2015-07-23T02:12:36Z -
dc.date.created 2015-07-20 ko
dc.date.issued 2008-10 -
dc.identifier.citation JOURNAL OF POWER SOURCES, v.185, no.1, pp.280 - 286 ko
dc.identifier.issn 0378-7753 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/12354 -
dc.identifier.uri http://www.sciencedirect.com/science/article/pii/S0378775308013621 ko
dc.description.abstract The understanding of the degradation mechanisms of electrocatalysts is very important for developing durable electrocatalysts for polymer electrolyte membrane (PEM) fuel cells. The degradation of Pt/C electrocatalysts under potential-static holding conditions (at 1.2V and 1.4V vs. RHE) and potential step conditions with the upper potential of 1.4V for 150s and lower potential limits (0.85V and 0.60V) for 30s in each period [denoted as Pstep(1.4V_150s-0.85V_30s) and Pstep(1.4V_150s-0.60V_30s), respectively] were investigated. The electrocatalysts and support were characterized with electrochemical voltammetry, transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). Pt/C degrades much faster under Pstep conditions than that under potential-static holding conditions. Pt/C degrades under the Pstep(1.4V_150s-0.85V30s) condition mainly through the coalescence process of Pt nanoparticles due to the corrosion of carbon support, which is similar to that under the conditions of 1.2V- and 1.4V-potential-static holding; however, Pt/C degrades mainly through the dissolution/loss and dissolution/redeposition process if stressed under Pstep(1.4V_150s-0.60V30s). The difference in the degradation mechanisms is attributed to the chemical states of Pt nanoparticles: Pt dissolution can be alleviated by the protective oxide layer under the Pstep(1.4V_150s-0.85V_30s) condition and the potential-static holding conditions. These findings are very important for understanding PEM fuel cell electrode degradation and are also useful for developing fast test Protocol for screening durable catalyst Support materials. (c) 2008 Elsevier B.V. All rights reserved ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher ELSEVIER SCIENCE BV ko
dc.subject OXYGEN-REDUCTION ko
dc.subject CARBON NANOTUBES ko
dc.subject PLATINUM NANOPARTICLES ko
dc.subject SUPERCRITICAL-FLUID ko
dc.subject CATALYST SUPPORT ko
dc.title The influence of the electrochemical stressing (potential step and potential-static holding) on the degradation of polymer electrolyte membrane fuel cell electrocatalysts ko
dc.title.alternative The influence of the electrochemical stressing (potential step and potential-static holding) on the degradation of polymer electrolyte membrane fuel cell electrocatalysts ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-50949115781 ko
dc.identifier.wosid 000259906600041 ko
dc.type.rims ART ko
dc.description.wostc 44 *
dc.description.scopustc 44 *
dc.date.tcdate 2015-12-28 *
dc.date.scptcdate 2015-11-04 *
dc.identifier.doi 10.1016/j.jpowsour.2008.07.008 ko
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