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      Aging amorphous/crystalline heterophase PdCu nanosheets for catalytic reactions

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          ABSTRACT

          Phase engineering is arising as an attractive strategy to tune the properties and functionalities of nanomaterials. In particular, amorphous/crystalline heterophase nanostructures have exhibited some intriguing properties. Herein, the one-pot wet-chemical synthesis of two types of amorphous/crystalline heterophase PdCu nanosheets is reported, in which one is amorphous phase-dominant and the other one is crystalline phase-dominant. Then the aging process of the synthesized PdCu nanosheets is studied, during which their crystallinity increases, accompanied by changes in some physicochemical properties. As a proof-of-concept application, their aging effect on catalytic hydrogenation of 4-nitrostyrene is investigated. As a result, the amorphous phase-dominant nanosheets initially show excellent chemoselectivity. After aging for 14 days, their catalytic activity is higher than that of crystalline phase-dominant nanosheets. This work demonstrates the intriguing properties of heterophase nanostructures, providing a new platform for future studies on the regulation of functionalities and applications of nanomaterials by phase engineering.

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          Recent Advances in Ultrathin Two-Dimensional Nanomaterials.

          Chaoliang Tan, Xiehong Cao, Xue-Jun Wu … (2017)
          Since the discovery of mechanically exfoliated graphene in 2004, research on ultrathin two-dimensional (2D) nanomaterials has grown exponentially in the fields of condensed matter physics, material science, chemistry, and nanotechnology. Highlighting their compelling physical, chemical, electronic, and optical properties, as well as their various potential applications, in this Review, we summarize the state-of-art progress on the ultrathin 2D nanomaterials with a particular emphasis on their recent advances. First, we introduce the unique advances on ultrathin 2D nanomaterials, followed by the description of their composition and crystal structures. The assortments of their synthetic methods are then summarized, including insights on their advantages and limitations, alongside some recommendations on suitable characterization techniques. We also discuss in detail the utilization of these ultrathin 2D nanomaterials for wide ranges of potential applications among the electronics/optoelectronics, electrocatalysis, batteries, supercapacitors, solar cells, photocatalysis, and sensing platforms. Finally, the challenges and outlooks in this promising field are featured on the basis of its current development.
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            Catalysis with two-dimensional materials and their heterostructures.

            Dehui Deng, K. S. Novoselov, Qiang Fu … (2016)
            Graphene and other 2D atomic crystals are of considerable interest in catalysis because of their unique structural and electronic properties. Over the past decade, the materials have been used in a variety of reactions, including the oxygen reduction reaction, water splitting and CO2 activation, and have been shown to exhibit a range of catalytic mechanisms. Here, we review recent advances in the use of graphene and other 2D materials in catalytic applications, focusing in particular on the catalytic activity of heterogeneous systems such as van der Waals heterostructures (stacks of several 2D crystals). We discuss the advantages of these materials for catalysis and the different routes available to tune their electronic states and active sites. We also explore the future opportunities of these catalytic materials and the challenges they face in terms of both fundamental understanding and the development of industrial applications.
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              Ultrathin Two-Dimensional Nanomaterials.

              Hua Zhang (2015)
              The past decade has witnessed an extraordinary increase in research progress on ultrathin two-dimensional (2D) nanomaterials in the fields of condensed matter physics, materials science, and chemistry after the exfoliation of graphene from graphite in 2004. This unique class of nanomaterials has shown many unprecedented properties and thus is being explored for numerous promising applications. In this Perspective, I briefly review the state of the art in the development of ultrathin 2D nanomaterials and highlight their unique advantages. Then, I discuss the typical synthetic methods and some promising applications of ultrathin 2D nanomaterials together with some personal insights on the challenges in this research area. Finally, on the basis of the current achievement on ultrathin 2D nanomaterials, I give some personal perspectives on potential future research directions.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Natl Sci Rev
                Journal ID (iso-abbrev): Natl Sci Rev
                Journal ID (publisher-id): nsr
                Title: National Science Review
                Publisher: Oxford University Press
                ISSN (Print): 2095-5138
                ISSN (Electronic): 2053-714X
                Publication date (Print): October 2019
                Publication date (Electronic): 05 July 2019
                Publication date PMC-release: 05 July 2019
                Volume: 6
                Issue: 5
                Pages: 955-961
                Affiliations
                [1 ] Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University , Singapore 639798, Singapore
                [2 ] State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190, China
                [3 ] Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China
                [4 ] School of Physical Sciences, University of Chinese Academy of Sciences , Beijing 100049, China
                [5 ] Singapore Institute of Manufacturing Technology, A*STAR, Singapore 638075, Singapore
                [6 ] School of Materials Science and Engineering, University of Science and Technology Beijing , Beijing 100083, China
                [7 ] School of Chemical and Biomedical Engineering, Nanyang Technological University , Singapore 637459, Singapore
                [8 ] Songshan Lake Materials Laboratory , Dongguan 523808, China
                [9 ] Department of Chemistry, City University of Hong Kong , Hong Kong, China
                Author notes
                Corresponding author. E-mails: hzhang@ 123456ntu.edu.sg

                Equally contributed to this work.

                Author information
                http://orcid.org/0000-0002-5708-8379
                http://orcid.org/0000-0001-9518-740X
                Article
                Publisher ID: nwz078
                DOI: 10.1093/nsr/nwz078
                PMC ID: 8291566
                PubMed ID: 34691956
                SO-VID: 17f4d7e1-73b9-4f8e-9290-dd893cef1143
                Copyright © © The Author(s) 2019. Published by Oxford University Press on behalf of China Science Publishing & Media Ltd.
                License:

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 15 March 2019
                Date revision received : 12 June 2019
                Date accepted : 12 June 2019
                Page count
                Pages: 7
                Funding
                Funded by: ITC 10.13039/501100005388
                Funded by: National Precious Metals Material Engineering Research Center
                Funded by: City University of Hong Kong 10.13039/100007567
                Funded by: Ministry of Education 10.13039/100010002
                Award ID: MOE2015-T2-2-057
                Award ID: MOE2016-T2-2-103
                Award ID: MOE2017-T2-1-162
                Award ID: 2016-T1-002-051
                Award ID: 2017-T1-001-150
                Award ID: 2017- T1-002-119
                Funded by: Nanyang Technological University 10.13039/501100001475
                Award ID: M4081296.070.500000
                Categories
                Subject: Research Article
                Subject: Materials Science

                Keywords: amorphous/crystalline heterophase,nanosheets,aging,selective hydrogenation,catalysis
                Data availability:
                Keywords: amorphous/crystalline heterophase, nanosheets, aging, selective hydrogenation, catalysis

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