Detail publikačního výsledku

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.

Originální název

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

Anglický název

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

Druh

Článek WoS

Originální abstrakt

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.

Anglický abstrakt

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.

Klíčová slova

electrocatalysis; fuel cell; oxygen reduction; platinum nanoparticles; top-down synthesis

Klíčová slova v angličtině

electrocatalysis; fuel cell; oxygen reduction; platinum nanoparticles; top-down synthesis

Autoři

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.

Rok RIV

2021

Vydáno

06.03.2020

Nakladatel

AMER CHEMICAL SOC

Místo

WASHINGTON

ISSN

2155-5435

Periodikum

ACS Catalysis

Svazek

10

Číslo

5

Stát

Spojené státy americké

Strany od

3131

Strany do

3142

Strany počet

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"
}