TY - JOUR
T1 - Shape-Dependent Interactions of Palladium Nanocrystals with Hydrogen
AU - Klinkova, Anna
AU - Cherepanov, Pavel V.
AU - Ryabinkin, Ilya G.
AU - Ho, Martin
AU - Ashokkumar, Muthupandian
AU - Izmaylov, Artur F.
AU - Andreeva, Daria V.
AU - Kumacheva, Eugenia
PY - 2016/5/11
Y1 - 2016/5/11
N2 - Elucidation of the nature of hydrogen interactions with palladium nanoparticles is expected to play an important role in the development of new catalysts and hydrogen-storage nanomaterials. A facile scaled-up synthesis of uniformly sized single-crystalline palladium nanoparticles with various shapes, including regular nanocubes, nanocubes with protruded edges, rhombic dodecahedra, and branched nanoparticles, all stabilized with a mesoporous silica shell is developed. Interaction of hydrogen with these nanoparticles is studied by using temperature-programmed desorption technique and by performing density functional theory modeling. It is found that due to favorable arrangement of Pd atoms on their surface, rhombic dodecahedral palladium nanoparticles enclosed by {110} planes release a larger volume of hydrogen and have a lower desorption energy than palladium nanocubes and branched nanoparticles. These results underline the important role of {110} surfaces in palladium nanoparticles in their interaction with hydrogen. This work provides insight into the mechanism of catalysis of hydrogenation/dehydrogenation reactions by palladium nanoparticles with different shapes.
AB - Elucidation of the nature of hydrogen interactions with palladium nanoparticles is expected to play an important role in the development of new catalysts and hydrogen-storage nanomaterials. A facile scaled-up synthesis of uniformly sized single-crystalline palladium nanoparticles with various shapes, including regular nanocubes, nanocubes with protruded edges, rhombic dodecahedra, and branched nanoparticles, all stabilized with a mesoporous silica shell is developed. Interaction of hydrogen with these nanoparticles is studied by using temperature-programmed desorption technique and by performing density functional theory modeling. It is found that due to favorable arrangement of Pd atoms on their surface, rhombic dodecahedral palladium nanoparticles enclosed by {110} planes release a larger volume of hydrogen and have a lower desorption energy than palladium nanocubes and branched nanoparticles. These results underline the important role of {110} surfaces in palladium nanoparticles in their interaction with hydrogen. This work provides insight into the mechanism of catalysis of hydrogenation/dehydrogenation reactions by palladium nanoparticles with different shapes.
KW - hydrogen
KW - palladium nanoparticles
KW - shape control
KW - temperature-programmed spectroscopy
KW - thermal stability
UR - http://www.scopus.com/inward/record.url?scp=84978001411&partnerID=8YFLogxK
U2 - 10.1002/smll.201600015
DO - 10.1002/smll.201600015
M3 - Article
AN - SCOPUS:84978001411
SN - 1613-6810
VL - 12
SP - 2450
EP - 2458
JO - Small
JF - Small
IS - 18
ER -