Journal
SMALL
Volume 17, Issue 20, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202008010
Keywords
copper catalyst; density functional calculations; formic acid; non‐ contact atomic force microscopy; scanning tunneling microscopy
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Funding
- JSPS KAKENHI [JP17K19024, JP18H01807, JP18H03859, JP18H05517, JP18H05519, JP20H02569]
- ATI
- Sumitomo Foundation
- Shimadzu Science Foundation
- Elements Strategy Initiative for Catalysts & Batteries (ESICB) of the Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan [JPMXP0112101003]
- Toray Science Foundation
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This study reveals the temperature-dependent adsorption structures of HCOOH on Cu(111) surface through experimental and theoretical simulations. Different adsorption states were observed at different temperatures, and the interactions between adsorbates play a crucial role in stability and catalytic activity.
Formic acid (HCOOH) can be catalytically decomposed into H-2 and CO2 and is a promising hydrogen storage material. As H-2 production catalysts, Cu surfaces allow selective HCOOH decarboxylation; however, the on-surface HCOOH decomposition reaction pathway remains controversial. In this study, the temperature dependence of the HCOOH/Cu(111) adsorption structures is elucidated by scanning tunneling microscopy and non-contact atomic force microscopy, establishing the adsorbate chemical species using density functional theory. 2D HCOOH islands at 80 K, linear chains of HCOOH and monodentate formate at 150 K, chain-like assemblies of monodentate and bidentate formate at 200 K, and bidentate formate clusters at 300 K are observed. At each temperature, the adsorbates experience attractive interactions among themselves. Such aggregation stabilizes them against desorption and decomposition. Thus, accurate evaluation of intermolecular interactions is essential to understand catalytic reactivity.
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