Special Issue "Photoelectrochemical Properties of Nanomaterials and Applications in Energy Conversion and Environmental Remediation"

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

Deadline for manuscript submissions: 30 December 2021.

Special Issue Editors

Dr. Jung-Ho Yun
E-Mail Website
Guest Editor
Nanomaterials Centre, School of Chemical Engineering, Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St. Lucia QLD, 4072, Australia
Interests: semiconducting nanomaterials; photoelectrochemistry; water splitting for H2 geneation; halide perovskite materials; perovskite solar cells; optoelectronic devices
Dr. Jeonghun Kim
E-Mail Website
Guest Editor
College of Science and Technology, Department of Applied Chemistry, Kookmin University, 77, Jeongneung-ro, Seongbuk-gu, Seoul 02707, South Korea
Interests: functional nanomaterials; nanoporous materials; polymers; metal-organic frameworks (MOF); carbon; metal oxide; metal; nanostructure
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

Since Fujishima’s research on Electrochemical Photolysis of Water Using Nanomaterial-Based Photoelectrodes in 1972, the photoelectrochemical (PEC) properties of semiconducting nanomaterials have been attracting great attention based on expectations of clean, renewable, and sustainable technologies in energy and environmental fields. The novel PEC properties of semiconducting nanomaterials shed significant insights into emerging solar-driven research areas, including solar-to-fuel conversion by water splitting for H2 and PEC reduction of CO2, solar-to-energy conversion by solar cells and solar fuel cells, and environmental remediation by advanced oxidation process (AOP) along with their hybrid systems. In particular, the design of novel semiconducting nanomaterials and in-depth investigation of PEC mechanisms in the applied devices will be key drivers in achieving innovative solar-driven energy and environmental applications. Thus, it is expected that this Special Issue of Nanomaterials will offer in-depth knowledge and new research findings on PEC characteristics of nanomaterials, contributing to advancing solar-driven energy conversion and environmental applications utilizing PEC mechanisms.

Dr. Jung-Ho Yun
Dr. Jeonghun Kim
Guest Editors

Manuscript Submission Information

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Keywords

  • Photoelectrochemistry and photocatalysis
  • Photocharge transport dynamics mechanism in semiconducting nanomaterials system
  • Photoactive nanomaterials
  • Nanostructured photoelectrodes
  • Photoelectrochemical water splitting for H2 generation
  • Photoelectrochemical CO2 reduction
  • Solar cells using nanostructured photoelectrodes
  • Electronic device applications using photoelectrochemical characteristics of nanomaterials
  • Photoelectrochemical advanced oxidation process for environmental remediation
  • Photoelectrochemical hybrid system integrating H2 generation and environmental remediation

Published Papers (6 papers)

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Research

Article
Characteristics of P-Type and N-Type Photoelectrochemical Biosensors: A Case Study for Esophageal Cancer Detection
Nanomaterials 2021, 11(5), 1065; https://doi.org/10.3390/nano11051065 - 21 Apr 2021
Viewed by 366
Abstract
P-type and N-type photoelectrochemical (PEC) biosensors were established in the laboratory to discuss the correlation between characteristic substances and photoactive material properties through the photogenerated charge carrier transport mechanism. Four types of human esophageal cancer cells (ECCs) were analyzed without requiring additional bias [...] Read more.
P-type and N-type photoelectrochemical (PEC) biosensors were established in the laboratory to discuss the correlation between characteristic substances and photoactive material properties through the photogenerated charge carrier transport mechanism. Four types of human esophageal cancer cells (ECCs) were analyzed without requiring additional bias voltage. Photoelectrical characteristics were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), UV–vis reflectance spectroscopy, and photocurrent response analyses. Results showed that smaller photocurrent was measured in cases with advanced cancer stages. Glutathione (L-glutathione reduced, GSH) and Glutathione disulfide (GSSG) in cancer cells carry out redox reactions during carrier separation, which changes the photocurrent. The sensor can identify ECC stages with a certain level of photoelectrochemical response. The detection error can be optimized by adjusting the number of cells, and the detection time of about 5 min allowed repeated measurement. Full article
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Article
Efficient and Rapid Photocatalytic Degradation of Methyl Orange Dye Using Al/ZnO Nanoparticles
Nanomaterials 2021, 11(4), 1059; https://doi.org/10.3390/nano11041059 - 20 Apr 2021
Viewed by 501
Abstract
ZnO and Aluminum doped ZnO nanoparticles (Al/ZnO NPs) were successfully synthesized by the sol-gel method. Together with the effect of calcination temperatures (200, 300 and 400 °C) and Al dosage (1%, 3%, 5% and 10%) on structural, morphological and optical properties of Al/ZnO [...] Read more.
ZnO and Aluminum doped ZnO nanoparticles (Al/ZnO NPs) were successfully synthesized by the sol-gel method. Together with the effect of calcination temperatures (200, 300 and 400 °C) and Al dosage (1%, 3%, 5% and 10%) on structural, morphological and optical properties of Al/ZnO NPs, their photocatalytic degradation of methyl orange (MO) dye was investigated. The calcination temperatures at 200, 300 and 400 °C in forming structure of ZnO NPs led to spherical nanoparticle, nanorod and nanoflake structures with a well-crystalline hexagonal wurtzite, respectively. The ZnO NPs calcined at 200 °C exhibited the highest specific surface area and light absorption property, leading to the MO removal efficiency of 80% after 4 h under the Ultraviolet (UV) light irradiation. The MO removal efficiency was approximately two times higher than the nanoparticles calcined at 400 °C. Furthermore, the 5% Al/ZnO NPs exhibited superior MO removal efficiency of 99% in only 40 min which was approximately 20 times enhancement in photocatalytic activity compared to pristine ZnO under the visible light irradiation. This high degradation performance was attributed to the extended light absorption, narrowed band gap and effective suppression of electron–hole recombination through an addition of Al metal. Full article
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Article
GABr Post-Treatment for High-Performance MAPbI3 Solar Cells on Rigid Glass and Flexible Substrate
Nanomaterials 2021, 11(3), 750; https://doi.org/10.3390/nano11030750 - 16 Mar 2021
Viewed by 467
Abstract
Perovskite solar cells have exhibited astonishing photoelectric conversion efficiency and have shown a promising future owing to the tunable content and outstanding optoelectrical property of hybrid perovskite. However, the devices with planar architecture still suffer from huge Voc loss and severe hysteresis [...] Read more.
Perovskite solar cells have exhibited astonishing photoelectric conversion efficiency and have shown a promising future owing to the tunable content and outstanding optoelectrical property of hybrid perovskite. However, the devices with planar architecture still suffer from huge Voc loss and severe hysteresis effect. In this research, Guanidine hydrobromide (GABr) post-treatment is carried out to enhance the performance of MAPbI3 n-i-p planar perovskite solar cells. The detailed characterization of perovskite suggests that GABr post-treatment results in a smoother absorber layer, an obvious reduction of trap states and optimized energy level alignment. By utilizing GABr post-treatment, the Voc loss is reduced, and the hysteresis effect is alleviated effectively in MAPbI3 solar cells. As a result, solar cells based on glass substrate with efficiency exceeding 20%, Voc of 1.13 V and significantly mitigated hysteresis are fabricated successfully. Significantly, we also demonstrate the effectiveness of GABr post-treatment in flexible device, whose efficiency is enhanced from 15.77% to 17.57% mainly due to the elimination of Voc loss. Full article
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Article
Novel Two-Dimensional Layered MoSi2Z4 (Z = P, As): New Promising Optoelectronic Materials
Nanomaterials 2021, 11(3), 559; https://doi.org/10.3390/nano11030559 - 24 Feb 2021
Viewed by 648
Abstract
Very recently, two new two-dimensional (2D) layered semi-conducting materials MoSi2N4 and WSi2N4 were successfully synthesized in experiments, and a large family of these two 2D materials, namely MA2Z4, was also predicted theoretically (Science, 369, 670 (2020)). Motivated by this exciting family, in this work, we systematically investigate the mechanical, electronic and optical properties of monolayer and bilayer MoSi2P4 and MoSi2As4 by using the first-principles calculation method. Numerical results indicate that both monolayer and bilayer MoSi2Z4 (Z = P, As) present good structural stability, isotropic mechanical parameters, moderate bandgap, favorable carrier mobilities, remarkable optical absorption, superior photon responsivity and external quantum efficiency. Especially, due to the wave-functions of band edges dominated by d orbital of the middle-layer Mo atoms are screened effectively, the bandgap and optical absorption hardly depend on the number of layers, providing an added convenience in the experimental fabrication of few-layer MoSi2Z4-based electronic and optoelectronic devices. We also build a monolayer MoSi2Z4-based 2D optoelectronic device, and quantitatively evaluate the photocurrent as a function of energy and polarization angle of the incident light. Our investigation verifies the excellent performance of a few-layer MoSi2Z4 and expands their potential application in nanoscale electronic and optoelectronic devices. Full article
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Article
Preparation of Monodispersed Cs0.33WO3 Nanocrystals by Mist Chemical Vapor Deposition for Near-Infrared Shielding Application
Nanomaterials 2020, 10(11), 2295; https://doi.org/10.3390/nano10112295 - 20 Nov 2020
Viewed by 556
Abstract
In this study, single-phase Cs0.33WO3 nanocrystals were synthesized by a novel mist chemical vapor deposition method. As prepared, Cs0.33WO3 nanocrystals exhibited a microsphere-like appearance constructed with angular crystal grains with an average size of about 30–40 nm. [...] Read more.
In this study, single-phase Cs0.33WO3 nanocrystals were synthesized by a novel mist chemical vapor deposition method. As prepared, Cs0.33WO3 nanocrystals exhibited a microsphere-like appearance constructed with angular crystal grains with an average size of about 30–40 nm. Characterization by X-ray photoelectron spectroscopy indicated that Cs0.33WO3 nanocrystals consisted of mixed chemical valence states of tungsten ions W6+ and W5+, inducing many free electrons, which could scatter and absorb near-infrared (NIR) photons by plasmon resonance. These Cs0.33WO3 microspheres consisted of a loose structure that could be crushed to nanoscale particles and was easily applied for producing long-term stable ink after milling. Herein, a Cs0.33WO3/polymer composite was successfully fabricated via the ultrasonic spray coating method using mixed Cs0.33WO3 ink and polyurethane acrylate solution. The composite coatings exhibited excellent IR shielding properties. Remarkably, only 0.9 mg cm−2 Cs0.33WO3 could shield more than 70% of NIR, while still maintaining the visible light transmittance higher than 75%. Actual measurement results indicate that it has really good heat insulation properties and shows good prospect in heat insulation window applications. Full article
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Communication
Surface Degradation Mechanism on CH3NH3PbBr3 Hybrid Perovskite Single Crystal by a Grazing E-Beam Irradiation
Nanomaterials 2020, 10(7), 1253; https://doi.org/10.3390/nano10071253 - 28 Jun 2020
Cited by 3 | Viewed by 831
Abstract
To start a step such as some realization of minimized and integrated devices, it requires simply understanding the surface status of hybrid perovskite on the e-beam irradiation because many commercial semiconductor devices are performed with a surface patterning process using e-beam or etching [...] Read more.
To start a step such as some realization of minimized and integrated devices, it requires simply understanding the surface status of hybrid perovskite on the e-beam irradiation because many commercial semiconductor devices are performed with a surface patterning process using e-beam or etching gas. The surface status of CH3NH3PbBr3 (MAPbBr3) single crystal was studied after a grazing e-beam irradiation in an ultra-high vacuum. The prepared hybrid perovskite single crystal was irradiated by the 3 degree-grazing e-beam with energy of 15 kV for 10 min using a reflection high-electron energy diffraction technique. The e-beam irradiation on the MAPbBr3 hybrid perovskite single crystal induced the deformation from MAPbBr3 into MABr, Br2, and Pb on the surface. The gas phases of MABr and Br2 are depleted from the surface and the Pb element has remained on the surface. As a result of the e-beam irradiation, it formed a polycrystalline-like phase and Pb metal particles on the surface, respectively. Full article
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