Publication detail

Tailoring the Oxygen Reduction Activity of Pt Nanoparticles through Surface Defects: A Simple Top-Down Approach

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"
}