Journal article
Functional links between Pt single crystal morphology and nanoparticles with different size and shape: the oxygen reduction reaction case
Energy & environmental science, v 7(12), pp 4061-4069
01 Jan 2014
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Design of active and stable Pt-based nanoscale electrocatalysts for the oxygen reduction reaction (ORR) will be the key to improving the efficiency of fuel cells that are needed to deliver reliable, affordable and environmentally friendly energy. Here, by exploring the ORR on Pt single crystals, cubo-octahedral (polyhedral) Pt NPs with different sizes (ranging from 2 to 7 nm), and 7-8 nm Pt NPs with different shapes (cubo-octahedral vs. cube vs. octahedral), we presented a surface science approach capable of rationalizing, and ultimately understanding, fundamental relationships between stability of Pt NPs and activity of the ORR in acidic media. By exploring the potential induced dissolution/ re-deposition of Pt between 0.05 and 1.3 V, we found that concomitant variations in morphology of Pt(111) and Pt(100) lead to narrowing differences in activity between Pt single crystal surfaces. We also found that regardless of an initial size or shape, NPs are metastable and easily evolve to thermodynamically equilibrated shape and size with very similar activity for the ORR. We concluded that while initially clearly observed, the particle size and shape effects diminish as the particles age to the point that it may appear that the ORR depends neither on the particle size nor particle shape.
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Details
- Title
- Functional links between Pt single crystal morphology and nanoparticles with different size and shape: the oxygen reduction reaction case
- Creators
- Dongguo Li - Brown UniversityChao Wang - Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USADusan S. Strmcnik - Argonne National LaboratoryDusan V. Tripkovic - Argonne National LaboratoryXiaolian Sun - Brown UniversityYijin Kang - Argonne National LaboratoryMiaofang Chi - Oak Ridge National LaboratoryJoshua D. Snyder - Argonne National LaboratoryDennis van der Vliet - Argonne National LaboratoryYifen Tsai - Argonne National LaboratoryVojislav R. Stamenkovic - Argonne National LaboratoryShouheng Sun - Brown UniversityNenad M. Markovic - Argonne National LaboratoryArgonne National Lab. (ANL), Argonne, IL (United States)
- Publication Details
- Energy & environmental science, v 7(12), pp 4061-4069
- Publisher
- Royal Soc Chemistry
- Number of pages
- 9
- Grant note
- U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division; United States Department of Energy (DOE) DE-AC02-06CH11357 / U.S. Department of Energy Office of Science Laboratory by UChicago Argonne, LLC; United States Department of Energy (DOE) Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy; United States Department of Energy (DOE)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000345090100021
- Scopus ID
- 2-s2.0-84910108448
- Other Identifier
- 991019296570304721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Multidisciplinary
- Energy & Fuels
- Engineering, Chemical
- Environmental Sciences