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Fichtner, J. Watzele, S. Garlyyev, B. Kluge, RM. Haimerl, F. El-Sayed, HA. Li, WJ. Maillard, FM. Dubau, L. Chattot, R. Michalicka, J. Macak, JM. Wang, W. Wang, D. Gigl, T. Hugenschmidt, C. Bandarenka, AS.
Original Title
Tailoring the Oxygen Reduction Activity of Pt Nanoparticles through Surface Defects: A Simple Top-Down Approach
Type
journal article in Web of Science
Language
English
Original Abstract
Results from Pt model catalyst surfaces have demonstrated that surface defects, in particular surface concavities, can improve the oxygen reduction reaction (ORR) kinetics. It is, however, a challenging task to synthesize nanostructured catalysts with such defective surfaces. Hence, we present a one-step and upscalable top-down approach to produce a Pt/C catalyst (with similar to 3 nm Pt nanoparticle diameter). Using high-resolution transmission electron microscopy and tomography, electrochemical techniques, high-energy X-ray measurements, and positron annihilation spectroscopy, we provide evidence of a high density of surface defects (including surface concavities). The ORR activity of the developed catalyst exceeds that of a commercial Pt/C catalyst, at least 2.7 times in terms of specific activity (similar to 1.62 mA/cm(Pt)(2), at 0.9 V vs the reversible hydrogen electrode) and at least 1.7 times in terms of mass activity (similar to 712 mA/mg(Pt)), which can be correlated to the enhanced amount of surface defects. In addition, the technique used here reduces the complexity of the synthesis (and therefore production costs) in comparison to state of the art bottom-up techniques.
Keywords
electrocatalysis; fuel cell; oxygen reduction; platinum nanoparticles; top-down synthesis
Authors
Fichtner, J.; Watzele, S.; Garlyyev, B.; Kluge, RM.; Haimerl, F.; El-Sayed, HA.; Li, WJ.; Maillard, FM.; Dubau, L.; Chattot, R.; Michalicka, J.; Macak, JM.; Wang, W.; Wang, D.; Gigl, T.; Hugenschmidt, C.; Bandarenka, AS.
Released
6. 3. 2020
Publisher
AMER CHEMICAL SOC
Location
WASHINGTON
ISBN
2155-5435
Periodical
ACS Catalysis
Year of study
10
Number
5
State
United States of America
Pages from
3131
Pages to
3142
Pages count
23
URL
https://pubs.acs.org/doi/10.1021/acscatal.9b04974
BibTex
@article{BUT163841, author="Fichtner, J. and Watzele, S. and Garlyyev, B. and Kluge, RM. and Haimerl, F. and El-Sayed, HA. and Li, WJ. and Maillard, FM. and Dubau, L. and Chattot, R. and Michalicka, J. and Macak, JM. and Wang, W. and Wang, D. and Gigl, T. and Hugenschmidt, C. and Bandarenka, AS.", title="Tailoring the Oxygen Reduction Activity of Pt Nanoparticles through Surface Defects: A Simple Top-Down Approach", journal="ACS Catalysis", year="2020", volume="10", number="5", pages="3131--3142", doi="10.1021/acscatal.9b04974", issn="2155-5435", url="https://pubs.acs.org/doi/10.1021/acscatal.9b04974" }