Universität zu Köln

Franz, Dirk, Schroeder, Ulrike, Shayduk, Roman, Arndt, Bjoern, Noei, Heshmat ORCID: 0000-0003-1294-3527, Vonk, Vedran, Michely, Thomas and Stierle, Andreas ORCID: 0000-0002-0303-6282 (2021). Hydrogen Solubility and Atomic Structure of Graphene Supported Pd Nanoclusters. ACS Nano, 15 (10). S. 15771 - 15781. WASHINGTON: AMER CHEMICAL SOC. ISSN 1936-086X

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Abstract

We investigated the atomic structure of graphene supported Pd nanoclusters and their interaction with hydrogen up to atmospheric pressures at room temperature by surface X-ray diffraction and scanning tunneling microscopy. We find that Ir seeded Pd nanocluster superlattices with 1.2 nm cluster diameters can be grown on the graphene/Ir(111) moire ' template with high structural perfection. The superlattice clusters are anchored through the rehybridized graphene to the Ir support, which superimposes a 2.0% inplane compression onto the clusters. During hydrogen exposure at 10 mbar pressure and room temperature, a significant part of the clusters gets unpinned from the superlattice. The clusters in registry undergo an out-of-plane expansion only, whereas the detached clusters expand in in- and out-of-plane directions. The formation of a hydrogen rich PdHx alpha' phase was not observed. After exposure to 1 bar, the majority of the clusters are unpinned from superlattice sites, due to their surface interaction with hydrogen and possible spill over to the graphene support. Only minor sintering was observed, which is more pronounced for the unpinned clusters. The results give evidence that ultrasmall Pd clusters on graphene are a stable hydrogen storage system with reduced hydrogen storage hysteresis and maintain a large surface area for hydrogen chemisorption.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Franz, Dirk UNSPECIFIED UNSPECIFIED UNSPECIFIED Schroeder, Ulrike UNSPECIFIED UNSPECIFIED UNSPECIFIED Shayduk, Roman UNSPECIFIED UNSPECIFIED UNSPECIFIED Arndt, Bjoern UNSPECIFIED UNSPECIFIED UNSPECIFIED Noei, Heshmat UNSPECIFIED orcid.org/0000-0003-1294-3527 UNSPECIFIED Vonk, Vedran UNSPECIFIED UNSPECIFIED UNSPECIFIED Michely, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Stierle, Andreas UNSPECIFIED orcid.org/0000-0002-0303-6282 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-581412
DOI:	10.1021/acsnano.1c01997
Journal or Publication Title:	ACS Nano
Volume:	15
Number:	10
Page Range:	S. 15771 - 15781
Date:	2021
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1936-086X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language STORAGE PROPERTIES; LATTICE EXPANSION; PALLADIUM; NANOPARTICLES; ADSORPTION; REACTIVITY Multiple languages Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/58141