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Unique Dynamics of Water Confined on the Surface of Metal Oxide Clusters
Author(s) -
Cai Linkun,
Lai Yuyan,
Yin Panchao
Publication year - 2021
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.202000832
Subject(s) - supercooling , chemical physics , oxide , cluster (spacecraft) , catalysis , phase (matter) , relaxation (psychology) , metal , transition metal , chemistry , phase transition , molecular dynamics , materials science , chemical engineering , computational chemistry , thermodynamics , organic chemistry , physics , engineering , psychology , social psychology , computer science , programming language
Water confined on metal oxide surface plays significant roles in heterogeneous catalysis. Heteropolyacid, a 1.2 nm‐metal oxide cluster with well‐defined structure, is applied as a model to understand the dynamics of water on its surface. The surface water strongly associates with heteropolyacid cluster and form the so‐called ‘pseudoliquid phase’ where catalytic reactions are conducted. Broadband dielectric spectroscopy and dierential scanning calorimetry have been applied to probe the dynamics of water in this pseudoliquid phase. A supercooling phase transition of water below its normal melting temperature and a dipolar glassy relaxation behaviour due to the hindered dynamics of water have been observed. The rich dynamic behavior on the surface of such well‐defined metal clusters provide new perspectives to understand the properties of surface water and their relation to catalytic performance of heteropolyacid.