Nanomaterials for Green Energy Applications

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Energy and Catalysis".

Deadline for manuscript submissions: closed (20 September 2021) | Viewed by 9367

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Guest Editor
Institute for Optoelectronics Systems and Microtecnology (ISOM), E.T.S.I.Telecomunicación, Technical University of Madrid (UPM), 28040 Madrid, Spain
Interests: graphene; 2D materials; energy; nanotechnology; nanoelectronics; AFM
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Special Issue Information

Dear Colleagues,

Graphene and other 2D materials have attracted increasing attention since 2004 due to its excellent mechanical, optical and electrical properties.

Its high specific surface area and in some cases high electrical conductivity make them an attractive materials for many industrial applications. In special in the energy area, the use of nanomaterials in energy storage devices is one of the most promising applications as a consequence of the increasing demand for more efficient, longer-lasting and more compact portable electronic devices.  These nanomaterials have increased the performance in batteries and supercapacitors.

Also, the optical properties of these nanomaterials can be used for electrodes in solar cells or other different devices in order to generate electrical energy. And using its mechanical properties, nanomaterials can be used as a part of mechanical transducers. Finally, the combination of graphene with other 2D materials or nanomaterials allows the creation of new devices that could generate and storage energy in a more efficient way.

We look forward to receiving your submissions!

Prof. Dr. Javier Martinez Rodrigo
Guest Editor

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Keywords

  • graphene
  • 2D materials
  • nanomaterials
  • solar cells
  • supercapacitors
  • batteries
  • electrodes
  • energy

Published Papers (3 papers)

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Research

15 pages, 3416 KiB  
Article
Designing a Graphene Coating-Based Supercapacitor with Lithium Ion Electrolyte: An Experimental and Computational Study via Multiscale Modeling
by Joseph Paul Baboo, Shumaila Babar, Dhaval Kale, Constantina Lekakou and Giuliano M. Laudone
Nanomaterials 2021, 11(11), 2899; https://doi.org/10.3390/nano11112899 - 29 Oct 2021
Cited by 9 | Viewed by 1956
Abstract
Graphene electrodes are investigated for electrochemical double layer capacitors (EDLCs) with lithium ion electrolyte, the focus being the effect of the pore size distribution (PSD) of electrode with respect to the solvated and desolvated electrolyte ions. Two graphene electrode coatings are examined: a [...] Read more.
Graphene electrodes are investigated for electrochemical double layer capacitors (EDLCs) with lithium ion electrolyte, the focus being the effect of the pore size distribution (PSD) of electrode with respect to the solvated and desolvated electrolyte ions. Two graphene electrode coatings are examined: a low specific surface area (SSA) xGNP-750 coating and a high SSA coating based on a-MWGO (activated microwave expanded graphene oxide). The study comprises an experimental and a computer modeling part. The experimental part includes fabrication, material characterization and electrochemical testing of an EDLC with xGNP-750 coating electrodes and electrolyte 1M LiPF6 in EC:DMC. The computational part includes simulations of the galvanostatic charge-discharge of each EDLC type, based on a continuum ion transport model taking into account the PSD of electrodes, as well as molecular modeling to determine the parameters of the solvated and desolvated electrolyte ions and their adsorption energies with each type of electrode pore surface material. Predictions, in agreement with the experimental data, yield a specific electrode capacitance of 110 F g−1 for xGNP-750 coating electrodes in electrolyte 1M LiPF6 in EC:DMC, which is three times higher than that of the high SSA a-MWGO coating electrodes in the same lithium ion electrolyte. Full article
(This article belongs to the Special Issue Nanomaterials for Green Energy Applications)
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10 pages, 2447 KiB  
Article
Room Temperature Processed Double Electron Transport Layers for Efficient Perovskite Solar Cells
by Wen Huang, Rui Zhang, Xuwen Xia, Parker Steichen, Nanjing Liu, Jianping Yang, Liang Chu and Xing’ao Li
Nanomaterials 2021, 11(2), 329; https://doi.org/10.3390/nano11020329 - 27 Jan 2021
Cited by 9 | Viewed by 3491
Abstract
Zinc Oxide (ZnO) has been regarded as a promising electron transport layer (ETL) in perovskite solar cells (PSCs) owing to its high electron mobility. However, the acid-nonresistance of ZnO could destroy organic-inorganic hybrid halide perovskite such as methylammonium lead triiodide (MAPbI3) [...] Read more.
Zinc Oxide (ZnO) has been regarded as a promising electron transport layer (ETL) in perovskite solar cells (PSCs) owing to its high electron mobility. However, the acid-nonresistance of ZnO could destroy organic-inorganic hybrid halide perovskite such as methylammonium lead triiodide (MAPbI3) in PSCs, resulting in poor power conversion efficiency (PCE). It is demonstrated in this work that Nb2O5/ZnO films were deposited at room temperature with RF magnetron sputtering and were successfully used as double electron transport layers (DETL) in PSCs due to the energy band matching between Nb2O5 and MAPbI3 as well as ZnO. In addition, the insertion of Nb2O5 between ZnO and MAPbI3 facilitated the stability of the perovskite film. A systematic investigation of the ZnO deposition time on the PCE has been carried out. A deposition time of five minutes achieved a ZnO layer in the PSCs with the highest power conversion efficiency of up to 13.8%. This excellent photovoltaic property was caused by the excellent light absorption property of the high-quality perovskite film and a fast electron extraction at the perovskite/DETL interface. Full article
(This article belongs to the Special Issue Nanomaterials for Green Energy Applications)
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18 pages, 7512 KiB  
Article
Manganese and Graphene Included Titanium Dioxide Composite Nanowires: Fabrication, Characterization and Enhanced Photocatalytic Activities
by Jun-Cheol Lee, Anantha-Iyengar Gopalan, Gopalan Saianand, Kwang-Pill Lee and Wha-Jung Kim
Nanomaterials 2020, 10(3), 456; https://doi.org/10.3390/nano10030456 - 4 Mar 2020
Cited by 28 | Viewed by 3145
Abstract
We report the detailed microstructural, morphological, optical and photocatalytic studies of graphene (G) and manganese (Mn) co-doped titanium dioxide nanowires (TiO2(G–Mn) NWs) prepared through facile combined electrospinning–hydrothermal processes. The as-prepared samples were thoroughly characterized using X-ray diffraction (XRD), transmission electron microscopy, [...] Read more.
We report the detailed microstructural, morphological, optical and photocatalytic studies of graphene (G) and manganese (Mn) co-doped titanium dioxide nanowires (TiO2(G–Mn) NWs) prepared through facile combined electrospinning–hydrothermal processes. The as-prepared samples were thoroughly characterized using X-ray diffraction (XRD), transmission electron microscopy, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and diffuse reflectance spectroscopy (DRS). XRD studies reveal the formation of mixed anatase-rutile phases or rutile phase depending on the dopant (Mn) precursor concentrations in the electrospinning dope and calcination temperature. The evaluation of lattice parameters revealed that the incorporation of Mn species and carbon atoms in to the lattice of anatase or rutile TiO2 could occur through substituting the sites of oxygen atoms. XPS results confirm the existence of Mn2+/Mn3+ within the TiO2 NW. Raman spectroscopy provides the evidence for structural modification because of the graphene inclusion in TiO2 NW. The optical band gap of G–Mn including TiO2 is much lower than pristine TiO2 as confirmed through UV-vis DRS. The photocatalytic activities were evaluated by nitric oxide (NOx) degradation tests under visible light irradiation. Superior catalytic activity was witnessed for rutile G–Mn-co-doped TiO2 NW over their anatase counterparts. The enhanced photocatalytic property was discussed based on the synergistic effects of doped G and Mn atoms and explained by plausible mechanisms. Full article
(This article belongs to the Special Issue Nanomaterials for Green Energy Applications)
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