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2D Nanosheets and Their Nanohybrids

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Nanochemistry".

Deadline for manuscript submissions: 30 June 2024 | Viewed by 5440

Special Issue Editors

Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes, Suzhou University, Suzhou 234000, China
Interests: nanomaterials; synthesis; characterization; catalysis; supercapacitor
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Physics and Engineering Physics, Morgan State University, Baltimore, MD 21251, USA
Interests: renewable energy; photo-/electro-catalysts; nanosensing; mechanical response; electron microscopy; nanomaterials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The unique structure of 2D nanosheets and their nanohybrids is what makes them great candidates for energy catalysis. The high surface area and uniformity of nanosheets make them ideal candidates for use in catalysis. Theoretical and experimental studies show that 2D nanosheets are promising materials for enhancing catalytic activity. Nanosheets are characterized by their nanoscale dimensions. They can be manufactured in various forms and shapes. As such, the unique shape and size of these materials allow them to take on different functions within a wide variety of applications such as catalysis. The energy catalyst 2D nanosheets and their nanohybrids are the most promising materials for a wide range of applications in the future.

Furthermore, 2D materials with ultrathin structures and unique physicochemical properties as well as their designed 2D nanohybrids can serve as novel catalytic materials, which play an important role in green, clean, and sustainable technologies with impact features of environmental friendliness, low-carbon, green, and renewable energy.

This Special Issue will cover the latest material discoveries and progress in the energy catalysis of 2D materials. The topics include 2D nanosheets and their nanohybrids, for example, Graphene, MXenes, transition-metal carbide, sulfide, and phosphides. Moreover, 2D catalytic materials are a new class of heterogeneous catalysts in various electrochemical reaction systems, such as oxygen reduction reaction, hydrogen evolution reaction, oxygen evolution reaction, and electrochemical reduction in carbon dioxides. Topics include, but are not limited to:

  1.  Hydrogen evolution reaction;
  2.  Oxygen evolution reaction;
  3.  Oxygen reduction reaction;
  4.  Electrochemical reduction in carbon dioxides;
  5.  Ammonia synthesis;
  6.  Environment Protection and Remediation, Water Treatment;
  7.  Modeling and Simulation.

Dr. Jin Jia
Prof. Dr. Yucheng Lan
Guest Editors

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. Molecules 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 2700 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 nanosheets
  • nanohybrids
  • graphene
  • MXenes
  • transition-metal carbide
  • sulfide
  • phosphides
  • hydrogen evolution reaction
  • oxygen evolution reaction
  • oxygen reduction reaction
  • electrochemical reduction in carbon dioxides
  • ammonia synthesis

Related Special Issue

Published Papers (6 papers)

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Research

12 pages, 7008 KiB  
Article
Nanoscale Evaluation of the Degradation Stability of Black Phosphorus Nanosheets Functionalized with PEG and Glutathione-Stabilized Doxorubicin Drug-Loaded Gold Nanoparticles in Real Functionalized System
by Thisari Maleesha Gunathilaka and Masaru Shimomura
Molecules 2024, 29(8), 1746; https://doi.org/10.3390/molecules29081746 - 12 Apr 2024
Viewed by 473
Abstract
Two-dimensional black phosphorus (2D BP) has attracted significant research interest in the field of biomedical applications due to its unique characteristics, including high biocompatibility, impressive drug-loading efficiency, phototherapeutic ability, and minimal side effects. However, its puckered honeycomb lattice structure with lone-pair electrons of [...] Read more.
Two-dimensional black phosphorus (2D BP) has attracted significant research interest in the field of biomedical applications due to its unique characteristics, including high biocompatibility, impressive drug-loading efficiency, phototherapeutic ability, and minimal side effects. However, its puckered honeycomb lattice structure with lone-pair electrons of BP leads to higher sensitivity and chemical reactivity towards H2O and O2 molecules, resulting in the degradation of the structure with physical and chemical changes. In our study, we synthesize polyethylene glycol (PEG) and glutathione-stabilized doxorubicin drug-assembled Au nanoparticle (Au-GSH-DOX)-functionalized BP nanosheets (BP-PEG@Au-GSH-DOX) with improved degradation stability, biocompatibility, and tumor-targeting ability. Transmission electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy indicate the nanoscale degradation behavior of synthesized nanoconjugates in three different environmental exposure conditions, and the results demonstrate the remarkable nanoscale stability of BP-PEG@Au-GSH-DOX against the degradation of BP, which provides significant interest in employing 2D BP-based nanotherapeutic agents for tumor-targeted cancer phototherapy. Full article
(This article belongs to the Special Issue 2D Nanosheets and Their Nanohybrids)
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14 pages, 3762 KiB  
Article
Broadening the Voltage Window of 3D-Printed MXene Micro-Supercapacitors with a Hybridized Electrolyte
by Xin Jiang, Haowen Jia, Xuan Chen, Jiajia Li, Yanling Chen, Jin Jia, Guangzhen Zhao, Lianghao Yu, Guang Zhu and Yuanyuan Zhu
Molecules 2024, 29(6), 1393; https://doi.org/10.3390/molecules29061393 - 20 Mar 2024
Cited by 1 | Viewed by 671
Abstract
The burgeoning demand for miniaturized energy storage devices compatible with the miniaturization trend of electronic technologies necessitates advancements in micro-supercapacitors (MSCs) that promise safety, cost efficiency, and high-speed charging capabilities. However, conventional aqueous MSCs face a significant limitation due to their inherently narrow [...] Read more.
The burgeoning demand for miniaturized energy storage devices compatible with the miniaturization trend of electronic technologies necessitates advancements in micro-supercapacitors (MSCs) that promise safety, cost efficiency, and high-speed charging capabilities. However, conventional aqueous MSCs face a significant limitation due to their inherently narrow electrochemical potential window, which restricts their operational voltage and energy density compared to their organic and ionic liquid counterparts. In this study, we introduce an innovative aqueous NaCl/H2O/EG hybrid gel electrolyte (comprising common salt (NaCl), H2O, ethylene glycol (EG), and SiO2) for Ti3C2Tx MXene MSCs that substantially widens the voltage window to 1.6 V, a notable improvement over traditional aqueous system. By integrating the hybrid electrolyte with 3D-printed MXene electrodes, we realized MSCs with remarkable areal capacitance (1.51 F cm−2) and energy density (675 µWh cm−2), significantly surpassing existing benchmarks for aqueous MSCs. The strategic formulation of the hybrid electrolyte—a low-concentration NaCl solution with EG—ensures both economic and environmental viability while enabling enhanced electrochemical performance. Furthermore, the MSCs fabricated via 3D printing technology exhibit exceptional flexibility and are suitable for modular device integration, offering a promising avenue for the development of high-performance, sustainable energy storage devices. This advancement not only provides a tangible solution to the challenge of limited voltage windows in aqueous MXene MSCs but also sets a new precedent for the design of next-generation MSCs that align with the needs of an increasingly microdevice-centric world. Full article
(This article belongs to the Special Issue 2D Nanosheets and Their Nanohybrids)
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12 pages, 3265 KiB  
Article
In Situ Hybridization Strategy Constructs Heterogeneous Interfaces to Form Electronically Modulated MoS2/FeS2 as the Anode for High-Performance Lithium-Ion Storage
by Dazhi Li, Changlong Sun, Zeqing Miao, Kesheng Gao, Zeyang Li, Wei Sun, Shengjing Guan, Xiaofei Qu and Zhenjiang Li
Molecules 2024, 29(6), 1387; https://doi.org/10.3390/molecules29061387 - 20 Mar 2024
Viewed by 537
Abstract
The interfacial effect is important for anodes of transition metal dichalcogenides (TMDs) to achieve superior lithium-ion storage performance. In this paper, a MoS2/FeS2 heterojunction is synthesized by a simple hydrothermal reaction to construct the interface effect, and the heterostructure introduces [...] Read more.
The interfacial effect is important for anodes of transition metal dichalcogenides (TMDs) to achieve superior lithium-ion storage performance. In this paper, a MoS2/FeS2 heterojunction is synthesized by a simple hydrothermal reaction to construct the interface effect, and the heterostructure introduces an inherent electric field that accelerates the de-embedding process of lithium ions, improves the electron transfer capability, and effectively mitigates volume expansion. XPS analysis confirms evident chemical interaction between MoS2 and FeS2 via an interfacial covalent bond (Mo–S–Fe). This MoS2/FeS2 anode shows a distinct interfacial effect for efficient interatomic electron migration. The electrochemical performance demonstrated that the discharge capacity can reach up to 1217.8 mA h g−1 at 0.1 A g−1 after 200 cycles, with a capacity retention rate of 72.9%. After 2000 cycles, the capacity retention is about 61.6% at 1.0 A g−1, and the discharge capacity can still reach 638.9 mA h g−1. Electrochemical kinetic analysis indicated an enhanced pseudocapacitance contribution and that the MoS2/FeS2 had sufficient adsorption of lithium ions. This paper therefore argues that this interfacial engineering is an effective solution for designing sulfide-based anodes with good electrochemical properties. Full article
(This article belongs to the Special Issue 2D Nanosheets and Their Nanohybrids)
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14 pages, 2866 KiB  
Article
Controllable La Deficiency Engineering within Perovskite Oxides for Enhanced Overall Water Splitting
by Xiaohu Xu, Kaiwei Guo and Xinyue Yu
Molecules 2024, 29(6), 1342; https://doi.org/10.3390/molecules29061342 - 18 Mar 2024
Viewed by 663
Abstract
Recently, perovskite (ABO3) nanomaterials have been widely explored as a class of versatile electrocatalysts for oxygen evolution reactions (OER) due to their remarkable compositional flexibility and structural tunability, but their poor electrical conductivity hinders hydrogen evolution reaction (HER) activity and further [...] Read more.
Recently, perovskite (ABO3) nanomaterials have been widely explored as a class of versatile electrocatalysts for oxygen evolution reactions (OER) due to their remarkable compositional flexibility and structural tunability, but their poor electrical conductivity hinders hydrogen evolution reaction (HER) activity and further limits the large-scale application of perovskite oxide in overall water splitting (OWS). In this study, hollow-nanotube-structure LaxCo0.4Fe0.6O3−δ (x = 1.0, 0.9, and 0.8) perovskites with superior HER/OER activity were synthesized on nickel-iron alloy foam (denoted LaxCoFe/NFF) using hydrothermal with a subsequent calcination strategy. Among them, La0.9CoFe/NFF not only exhibited extraordinary HER electrocatalytic performance (160.5 mV@10 mA cm−2 and 241.0 mV@100 mA cm−2) and stability (20 h@10 mA cm−2), but also displayed significant OER electrocatalytic activity (234.7 mV@10 mA cm−2 and 296.1 mV@100 mA cm−2) and durability (20 h@10 mA cm−2), outperforming many recently reported HER/OER perovskite catalysts. The increase in oxygen vacancies caused by the introduction of La deficiency leads to the expansion of the lattice, which greatly accelerates the HER/OER process of La0.9CoFe/NFF. Additionally, the naturally porous skeleton can prevent catalysts from aggregating as well as delay the corrosion and dissolution of catalysts in the electrolyte under high applied potentials. Furthermore, the assembled two-electrode configuration, utilizing La0.9CoFe/NFF (cathode and anode) electrodes, only requires a low cell voltage of 1.573 V at 10 mA cm−2 for robust alkaline OWS, accompanied by remarkable durability over 20 h. This work provides inspiration for the design and preparation of high-performance and stable bifunctional perovskite electrocatalysts for OWS. Full article
(This article belongs to the Special Issue 2D Nanosheets and Their Nanohybrids)
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12 pages, 4849 KiB  
Article
Construction of Single-Atom Catalysts for N, O Synergistic Coordination and Application to Electrocatalytic O2 Reduction
by Jin-Hang Liu, Huixiong Jiang, Bokai Liao, Xiaohua Cao, Langhua Yu and Xiudong Chen
Molecules 2023, 28(21), 7264; https://doi.org/10.3390/molecules28217264 - 25 Oct 2023
Viewed by 1076
Abstract
Replacing expensive platinum oxygen reduction reaction (ORR) catalysts with atomically dispersed single-atom catalysts is an effective way to improve the energy conversion efficiency of fuel cells. Herein, a series of single-atom catalysts, TM-N2O2Cx (TM=Sc-Zn) with TM-N2O [...] Read more.
Replacing expensive platinum oxygen reduction reaction (ORR) catalysts with atomically dispersed single-atom catalysts is an effective way to improve the energy conversion efficiency of fuel cells. Herein, a series of single-atom catalysts, TM-N2O2Cx (TM=Sc-Zn) with TM-N2O2 active units, were designed, and their catalytic performance for electrocatalytic O2 reduction was investigated based on density functional theory. The results show that TM-N2O2Cx exhibits excellent catalytic activity and stability in acidic media. The eight catalysts (TM=Sc, Ti, V, Cr, Mn, Fe, Co, and Ni) are all 4e reaction paths, among which Sc-N2O2Cx, Ti-N2O2Cx, and V-N2O2Cx follow dissociative mechanisms and the rest are consistent with associative mechanisms. In particular, Co-N2O2Cx and Ni-N2O2Cx enable a smooth reduction in O2 at small overpotentials (0.44 V and 0.49 V, respectively). Furthermore, a linear relationship between the adsorption free energies of the ORR oxygen-containing intermediates was evident, leading to the development of a volcano plot for the purpose of screening exceptional catalysts for ORR. This research will offer a novel strategy for the design and fabrication of exceptionally efficient non-precious metal catalysts on an atomic scale. Full article
(This article belongs to the Special Issue 2D Nanosheets and Their Nanohybrids)
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12 pages, 3996 KiB  
Article
Homogeneous Electrochemical Aptasensor for Sensitive Detection of Zearalenone Using Nanocomposite Probe and Silica Nanochannel Film
by Zhongnan Huang, Xuan Luo, Fei Yan and Bo Zhou
Molecules 2023, 28(21), 7241; https://doi.org/10.3390/molecules28217241 - 24 Oct 2023
Cited by 1 | Viewed by 975
Abstract
Developing rapid and efficient analytical methods is of great importance for food safety Herein, we present a novel homogeneous electrochemical aptasensor for ultrasensitive quantitative determination of zearalenone (ZEN) based on a nanocomposite probe and silica nanochannel film. X-ray photoelectron spectroscopy, Fourier transform infrared [...] Read more.
Developing rapid and efficient analytical methods is of great importance for food safety Herein, we present a novel homogeneous electrochemical aptasensor for ultrasensitive quantitative determination of zearalenone (ZEN) based on a nanocomposite probe and silica nanochannel film. X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and UV–Vis characterization techniques confirm that graphene oxide (GO) bears an aromatic conjugated structure, along with hydroxyl and carboxyl groups, facilitating the subsequent adsorption of cationic redox hexa-ammine-ruthenium (III) (Ru(NH3)63+) and anionic ZEN aptamer, to form a Ru(NH3)63+–ZEN aptamer–GO nanocomposite probe in a homogeneous solution. Vertically-ordered mesoporous silica films (VMSF) bearing silanol groups can be simply grown on the solid indium tin oxide (ITO) electrode surface and enable the selective preconcentration of Ru(NH3)63+, eventually leading to signal amplification. Since the detachment of Ru(NH3)63+ from the GO surface by the recognized ZEN aptamer in the presence of ZEN, more free Ru(NH3)63+ is released in solution and produces enhanced redox signals at the VMSF modified ITO electrode, allowing quantitative detection of ZEN. On the basis of the above sensing strategy, the proposed homogeneity, due to the assistance of graphene, as well as of the signal amplification and anti-fouling effects of VMSF, accurate analysis of ZEN can be realized in maize and Chinese chestnut samples. Full article
(This article belongs to the Special Issue 2D Nanosheets and Their Nanohybrids)
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