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Nanomaterials
Special Issues
Properties and Applications of Two-Dimensional Materials
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Properties and Applications of Two-Dimensional Materials

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "2D and Carbon Nanomaterials".

Deadline for manuscript submissions: closed (28 February 2023) | Viewed by 4296

Special Issue Editor

Dr. Feng He

E-Mail Website
Guest Editor
Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Interests: theoretical design and mechanism study of high performance of two-dimensional (2D) carbon materials-based systems in catalysis and energy conversion

Special Issue Information

Dear Colleagues,

The development of new materials represents a frontier of scientific research. Two-dimensional (2D) materials have promising application prospects and have attracted the interest of researchers due to their exceptional mechanical, thermal, optical, and electronic properties and more. Over the past few decades, large numbers of 2D materials (such as graphene, graphdiyne, MXenes, transition-metal compounds, etc.) have been created and applied in various fields such as catalysis, energy storage, solar cells, optoelectronic devices, biological applications, and environmental applications, etc. However, the opportunities and challenges that these 2D materials present coincide in fundamental and applied research in the current stage.

This Special Issue of Nanomaterials focuses on the theoretical and experimental progress related to new 2D materials or 2D-materials-based nanostructures with fascinating structural characteristics, novel electronic properties, and outstanding application performances. In the present Special Issue, we invite authors from leading groups in the field to contribute original research articles or review articles covering (but not limited to) topics such as the newest findings and developments related to 2D materials and 2D-materials-based nanostructures in catalysis and energy conversion. It aims to attract the attention of both academic and industrial researchers in order to further our deep understanding of the properties of 2D materials and promote their applications in future.

Dr. Feng He
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • 2D materials
  • catalysis
  • energy conversion
  • properties
  • applications

Published Papers (3 papers)

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Research

11 pages, 2953 KiB  
Article
Assembly of Hydrophobic ZIF-8 on CeO2 Nanorods as High-Efficiency Catalyst for Electrocatalytic Nitrogen Reduction Reaction
by Yiwen Liu, Xianbin Meng, Zhiqiang Zhao, Kai Li and Yuqing Lin
Nanomaterials 2022, 12(17), 2964; https://doi.org/10.3390/nano12172964 - 27 Aug 2022
Cited by 5 | Viewed by 1807
Abstract
The electrocatalytic nitrogen reduction reaction (NRR) can use renewable electricity to convert water and N2 into NH3 under normal temperature and pressure conditions. However, due to the competitiveness of the hydrogen evolution reaction (HER), the ammonia production rate (RNH3 [...] Read more.
The electrocatalytic nitrogen reduction reaction (NRR) can use renewable electricity to convert water and N2 into NH3 under normal temperature and pressure conditions. However, due to the competitiveness of the hydrogen evolution reaction (HER), the ammonia production rate (RNH3) and Faraday efficiency (FE) of NRR catalysts cannot meet the needs of large-scale industrialization. Herein, by assembling hydrophobic ZIF-8 on a cerium oxide (CeO2) nanorod, we designed an excellent electrocatalyst CeO2-ZIF-8 with intrinsic NRR activity. The hydrophobic ZIF-8 surface was conducive to the efficient three-phase contact point of N2 (gas), CeO2 (solid) and electrolyte (liquid). Therefore, N2 is concentrated and H+ is deconcentrated on the CeO2-ZIF-8 electrocatalyst surface, which improves NRR and suppresses HER and finally CeO2-ZIF-8 exhibits excellent NRR performance with an RNH3 of 2.12 μg h−1 cm−2 and FE of 8.41% at −0.50 V (vs. RHE). It is worth noting that CeO2-ZIF-8 showed excellent stability in the six-cycle test, and the RNH3 and FE variation were negligible. This study paves a route for inhibiting the competitive reaction to improve the NRR catalyst activity and may provide a new strategy for NRR catalyst design. Full article
(This article belongs to the Special Issue Properties and Applications of Two-Dimensional Materials)
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14 pages, 3069 KiB  
Article
Investigation of the Stability and Hydrogen Evolution Activity of Dual-Atom Catalysts on Nitrogen-Doped Graphene
by Qiansong Zhou, Meng Zhang, Beien Zhu and Yi Gao
Nanomaterials 2022, 12(15), 2557; https://doi.org/10.3390/nano12152557 - 25 Jul 2022
Cited by 7 | Viewed by 1851
Abstract
Single atom catalysts (SACs) have received a lot of attention in recent years for their high catalytic activity, selectivity, and atomic utilization rates. Two-dimensional N-doped graphene has been widely used to stabilize transition metal (TM) SACs in many reactions. However, the anchored SAC [...] Read more.
Single atom catalysts (SACs) have received a lot of attention in recent years for their high catalytic activity, selectivity, and atomic utilization rates. Two-dimensional N-doped graphene has been widely used to stabilize transition metal (TM) SACs in many reactions. However, the anchored SAC could lose its activity because of the too strong metal-N interaction. Alternatively, we studied the stability and activity of dual-atom catalysts (DACs) for 24 TMs on N-doped graphene, which kept the dispersion state but had different electronic structures from SACs. Our results show that seven DACs can be formed directly compared to the SACs. The others can form stably when the number of TMs is slightly larger than the number of vacancies. We further show that some of the DACs present better catalytic activities in hydrogen evolution reaction (HER) than the corresponding SACs, which can be attributed to the optimal charge transfer that is tuned by the additional atom. After the screening, the DAC of Re is identified as the most promising catalyst for HER. This study provides useful information for designing atomically-dispersed catalysts on N−doped graphene beyond SACs. Full article
(This article belongs to the Special Issue Properties and Applications of Two-Dimensional Materials)
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16 pages, 5043 KiB  
Article
NaCl-Templated Ultrathin 2D-Yttria Nanosheets Supported Pt Nanoparticles for Enhancing CO Oxidation Reaction
by Luozhen Jiang, Chen Tian, Yunan Li, Rui Si, Meng Du, Xiuhong Li, Lingling Guo and Lina Li
Nanomaterials 2022, 12(13), 2306; https://doi.org/10.3390/nano12132306 - 05 Jul 2022
Cited by 2 | Viewed by 1568
Abstract
Morphology of support is of fundamental significance to the fabrication of highly efficient catalysts for CO oxidation reaction. Many methods for the construction of supports with specific morphology and structures greatly rely on controlling general physical and chemical synthesis conditions such as temperature [...] Read more.
Morphology of support is of fundamental significance to the fabrication of highly efficient catalysts for CO oxidation reaction. Many methods for the construction of supports with specific morphology and structures greatly rely on controlling general physical and chemical synthesis conditions such as temperature or pH. In this paper, we report a facile route to prepare yttria nanosheet using NaCl as template to support platinum nanoparticles exhibiting higher CO oxidation activity than that of the normally prepared Pt/Y2O3. With the help of TEM and SEM, we found that Pt NPs evenly distributed on the surface of NaCl modified 2D-nanosheets with smaller size. The combination of XAFS and TEM characterizations demonstrated that the nano-size Pt species with PtxOy structure played an essential role in the conversion of CO and kept steady during the CO oxidation process. Moreover, the Pt nanoparticles supported on the NaCl templated Y2O3 nanosheets could be more easily reduced and thus exposed more Pt sites to adsorb CO molecules for CO oxidation according to XPS and DRIFTS results. This work offers a unique and general method for the preparation of potential non-cerium oxide rare earth element oxide supported nanocatalysts. Full article
(This article belongs to the Special Issue Properties and Applications of Two-Dimensional Materials)
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