TY - JOUR

T1 - Stable and Active Oxygen Reduction Catalysts with Reduced Noble Metal Loadings through Potential Triggered Support Passivation

AU - Göhl, Daniel

AU - Rueß, Holger

AU - Schlicht, Stefanie

AU - Vogel, Alexandra

AU - Rohwerder, Michael

AU - Mayrhofer, Karl J.J.

AU - Bachmann, Julien

AU - Román-Leshkov, Yuriy

AU - Schneider, Jochen M.

AU - Ledendecker, Marc

N1 - Funding Information: D.G. and K.J.J.M. want to thank the Federal Ministry for Economic Affairs and Energy (BMWi) of Germany in the framework of PtTM@HGS (project number 03ET6080 A) for funding. M.L. acknowledge the Federal Ministry of Education and Research (BMBF) in the framework of NanoMatFutur (SynKat) for financial support (project number 03XP0265). Further, S.S. and J.B. acknowledge the German Ministry of Education and research (BMBF) in the project ?Tubulair?? (project number 03SF0436G) and the German Research Foundation (DFG) via the Excellence Cluster ?Engineering of Advanced Materials? (EXC315) for funding. H.R. and J.M.S. gratefully acknowledges financial support from the MPG fellow program. Y.R.-L. acknowledges the Toyota Research Institute through the Accelerated Materials Design and Discovery program. Publisher Copyright: © 2020 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/6/2

Y1 - 2020/6/2

N2 - The development of stable, cost-efficient and active materials is one of the main challenges in catalysis. The utilization of platinum in the electroreduction of oxygen is a salient example where the development of new material combinations has led to a drastic increase in specific activity compared to bare platinum. These material classes comprise nanostructured thin films, platinum alloys, shape-controlled nanostructures and core–shell architectures. Excessive platinum substitution, however, leads to structural and catalytic instabilities. Herein, we introduce a catalyst concept that comprises the use of an atomically thin platinum film deposited on a potential-triggered passivating support. The model catalyst exhibits an equal specific activity with higher atom utilization compared to bulk platinum. By using potential-triggered passivation of titanium carbide, irregularities in the Pt film heal out via the formation of insoluble oxide species at the solid/liquid interface. The adaptation of the described catalyst design to the nanoscale and to high-surface-area structures highlight the potential for stable, passivating catalyst systems for various electrocatalytic reactions such as the oxygen reduction reaction.

AB - The development of stable, cost-efficient and active materials is one of the main challenges in catalysis. The utilization of platinum in the electroreduction of oxygen is a salient example where the development of new material combinations has led to a drastic increase in specific activity compared to bare platinum. These material classes comprise nanostructured thin films, platinum alloys, shape-controlled nanostructures and core–shell architectures. Excessive platinum substitution, however, leads to structural and catalytic instabilities. Herein, we introduce a catalyst concept that comprises the use of an atomically thin platinum film deposited on a potential-triggered passivating support. The model catalyst exhibits an equal specific activity with higher atom utilization compared to bulk platinum. By using potential-triggered passivation of titanium carbide, irregularities in the Pt film heal out via the formation of insoluble oxide species at the solid/liquid interface. The adaptation of the described catalyst design to the nanoscale and to high-surface-area structures highlight the potential for stable, passivating catalyst systems for various electrocatalytic reactions such as the oxygen reduction reaction.

KW - electrocatalysis

KW - fuel cells

KW - nanostructures

KW - oxygen reduction reaction

KW - self-healing

UR - http://www.scopus.com/inward/record.url?scp=85083221894&partnerID=8YFLogxK

U2 - 10.1002/celc.202000278

DO - 10.1002/celc.202000278

M3 - Article

AN - SCOPUS:85083221894

VL - 7

SP - 2404

EP - 2409

JO - ChemElectroChem

JF - ChemElectroChem

SN - 2196-0216

IS - 11

ER -