Stable and Active Oxygen Reduction Catalysts with Reduced Noble Metal Loadings through Potential Triggered Support Passivation. Issue 11 (6th April 2020)

• Record Type: Journal Article
• Authors: Göhl, Daniel; Rueß, Holger; Schlicht, Stefanie; Vogel, Alexandra; Rohwerder, Michael; Mayrhofer, Karl J. J.; Bachmann, Julien; Román‐Leshkov, Yuriy; Schneider, Jochen M.; Ledendecker, Marc
• Is Part Of: ChemElectroChem. Volume 7:Issue 11(2020)
• Page Start: 2404
• Page End: 2409
• Publication Date: 2020-04-06
• Subjects: electrocatalysis -- fuel cells -- nanostructures -- oxygen reduction reaction -- self-healing; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202000278
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: 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. Abstract : Self‐help : A catalyst concept is introduced that comprises the use of an atomically thin platinum film deposited on a potential‐triggered passivating support that heals out defects, resulting in high stability and activity while keeping the noble metal content low.