期刊
CARBON
卷 188, 期 -, 页码 367-375出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2021.11.069
关键词
Graphene; Graphene oxide; Single metal atoms; Hot pressing; Graphitization
资金
- Australian Research Council [DE210101618, DE180100294]
- School of Chemistry at the University of New South Wales
- National Key Research and Development Program of China [2019YFA0308000, 2018YFA0704201]
- National Natural Science Foundation of China [62022089]
- Faculty of Sciences at the University of New South Wales
- Australian Research Council [DE210101618, DE180100294] Funding Source: Australian Research Council
The effect of spatial confinement on suppressing migration and coalescence of metal atoms/clusters in solid films made of graphene oxide can increase the stability of dispersed metal atoms and nanoclusters at high temperatures. Pressing has a significant impact on the reduction of graphene oxide and the morphology and distribution of metals in the films, demonstrating the efficacy of externally applied pressure in controlling metal reactivity and mobility in bulk solids.
Incorporating homogeneously dispersed metal single atoms or nanoclusters into bulk matrix can produce functional materials for electrochemical catalysis, energy storage, and electronic devices. However, the instability of single metal atoms (or clusters) against agglomeration and thus loss of active surfaces during high-temperature treatment or reactions remains a major challenge. Here, we report the effect of spatial confinement on suppressing migration and coalescence of metal atoms/clusters in solid films made of stacked and/or overlapping ('reduced') graphene oxide, resulting in increased stability of dispersed metal (i.e., Cu, Co, Ni) atoms and nanoclusters at high temperature (1000 degrees C). We find that pressing has a significant impact on the degree of 'reduction' of graphene oxide and the morphology and distribution of metals in the films; the presence of metals influences the thermal 'reduction' and graphitization of graphene oxide. This work demonstrates the efficacy of externally applied pressure in controlling the reactivity and mobility of metal atoms/clusters in bulk solids, which can be a useful means for preparing a variety of atomic/nano-metal-based hybrid materials. (C) 2021 Elsevier Ltd. All rights reserved.
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