Advances in Photocatalysis and Electrocatalysis Applications

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Photocatalysis".

Deadline for manuscript submissions: closed (28 May 2024) | Viewed by 6671

Special Issue Editors

School of Food Engineering, Anhui Science and Technology University, Fengyang 233100, China
Interests: photocatalysis; hydrogen evolution; degradation; carbon dioxide reduction; heterojunctions; atomic defects
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Guest Editor
College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, China
Interests: electrocatalysis; methanol oxidation; oxygen reduction; nitrogen fixation; atomic defects

Special Issue Information

Dear Colleagues,

In recent decades, the world has seen tremendous growth and improvement in the quality of human life. However, this progress has come at a cost, with the increasing consumption of traditional fossil fuels, environmental pollution, and food contamination presenting challenges to further development. To tackle these issues, innovative solutions are required. It has been reported that photocatalysis and electrocatalysis offer effective solutions to energy and pollution problems. As such, there is a need for further research in these areas.

With this in mind, we are proud to announce our Special Issue on "Advances in Photocatalysis and Electrocatalysis Applications". Our focus is on the current state and future prospects of photocatalytic and electrocatalytic technologies. We invite submissions of both original research papers and review articles in the fields of novel heterojunction material design, new synthetic methods development, and the discovery of new photocatalytic and electrocatalytic mechanisms. The scope of this Special Issue encompasses a wide range of applications, including, but not limited to, hydrogen production, degradation, carbon dioxide reduction, sterilization, and photochemical and electrochemical methods to treat microorganisms, gene detection, cancer cells, etc.

Dr. Zhen Li
Prof. Dr. Zhenghua Wang
Guest Editors

Manuscript Submission Information

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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. Catalysts is an international peer-reviewed open access monthly 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

  • photocatalysis
  • electrocatalysis
  • energy
  • contamination
  • photochemistry
  • electrochemistry
  • microorganism
  • crops

Published Papers (5 papers)

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Research

13 pages, 6669 KiB  
Article
Efficient and Stable Degradation of Triazophos Pesticide by TiO2/WO3 Nanocomposites with S-Scheme Heterojunctions and Oxygen Defects
by Wen Li, Chunxu Chen, Renqiang Yang, Shuangli Cheng, Xiaoyu Sang, Meiwen Zhang, Jinfeng Zhang, Zhenghua Wang and Zhen Li
Catalysts 2023, 13(7), 1136; https://doi.org/10.3390/catal13071136 - 21 Jul 2023
Cited by 2 | Viewed by 1176
Abstract
The prevalent utilization of organophosphorus pesticides presents a profound risk to the global environment, necessitating the immediate development of a secure and reliable methodology to mitigate this hazard. Photocatalytic technology, through the generation of robust oxidizing free radicals by suitable catalysts, offers a [...] Read more.
The prevalent utilization of organophosphorus pesticides presents a profound risk to the global environment, necessitating the immediate development of a secure and reliable methodology to mitigate this hazard. Photocatalytic technology, through the generation of robust oxidizing free radicals by suitable catalysts, offers a viable solution by effectively oxidizing organophosphorus pesticides, thus preserving environmental well-being. In this study, we successfully synthesized TiO2/WO3 (TO/WO) nanocomposites characterized by oxygen defects and S-scheme heterojunctions, demonstrating superior photocatalytic activity in the degradation of triazophos. Notably, the 60-TO/WO nanocomposite, wherein the proportion of WO comprises 60% of the total, exhibited optimal photocatalytic degradation activity, achieving a degradation rate of 78% within 120 min, and demonstrating exceptional stability, maintaining impressive degradation activity across four cycles. This performance was notably superior to that of standalone TO and WO. The presence of oxygen defects in WO was corroborated by electron paramagnetic resonance (EPR) spectroscopy. The mechanism at the heterojunction of the 60-TO/WO nanocomposite, identified as an S-scheme, was also confirmed by EPR and theoretical computations. Oxygen defects expedite charge transfer and effectively enhance the photocatalytic reaction, while the S-scheme effectively segregates photogenerated electrons and holes, thereby optimizing the photocatalytic oxidation of triazophos. This study introduces a novel nanocomposite material, characterized by oxygen defects and the S-scheme heterojunction, capable of effectively degrading triazophos and promoting environmental health. Full article
(This article belongs to the Special Issue Advances in Photocatalysis and Electrocatalysis Applications)
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12 pages, 6366 KiB  
Article
Nickel Foam-Supported Hierarchical NiCo2S4 Nanostructures as Efficient Electrocatalysts for the Methanol Oxidation Reaction
by Dan Jin, Wenting Cheng, Shaoyun Wu, Zhen Li and Zhenghua Wang
Catalysts 2023, 13(7), 1099; https://doi.org/10.3390/catal13071099 - 14 Jul 2023
Cited by 1 | Viewed by 1236
Abstract
In this study, hierarchical NiCo2S4 nanostructures have been successfully prepared on Ni foam support using a simple and economical two-step hydrothermal process. The hierarchical NiCo2S4 nanostructure comprises rod-like NiCo2S4 cores enveloped by a thin [...] Read more.
In this study, hierarchical NiCo2S4 nanostructures have been successfully prepared on Ni foam support using a simple and economical two-step hydrothermal process. The hierarchical NiCo2S4 nanostructure comprises rod-like NiCo2S4 cores enveloped by a thin nanoribbon shell. When the NiCo2S4/Ni foam was employed as an electrode for methanol electrooxidation directly, a current density of 194 mA mg−1 was achieved at 0.60 V. The prepared NiCo2S4/Ni foam demonstrates high electrocatalytic activity and durability in alkaline environments for the methanol oxidation reaction. After 1000 cyclic voltammetry cycles in the alkaline electrolyte, the current density of the hierarchical NiCo2S4 decreased to 72.2% of its initial value, with the loss of catalytic activity during the cycling test attributed to their surface oxidation. These findings suggest the NiCo2S4 sample as a non-noble metal electrocatalyst holds great potential for direct methanol fuel cells. Full article
(This article belongs to the Special Issue Advances in Photocatalysis and Electrocatalysis Applications)
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13 pages, 6612 KiB  
Article
A Novel Ochratoxin A Aptasensor Based on Three-Dimensionally Ordered Macroporous RGO-AuNPs-MoS2 Enhanced Electrocatalysis of Methylene Blue and AuNPs-Fe3O4@C Composite as Signal Probe Carrier
by Gang Peng, Xu Zhang, Kaiwen Zhang, Xiaojun Chen and He Huang
Catalysts 2023, 13(7), 1088; https://doi.org/10.3390/catal13071088 - 11 Jul 2023
Viewed by 1136
Abstract
In this work, a novel electrochemical aptasensor for the detection of ochratoxin A (OTA) was developed using a three-dimensionally ordered macroporous (3DOM) reduced graphene oxide–Au nanoparticles–molybdenum disulfide (RGO-AuNPs-MoS2) composite material as the sensing interface and Au nanoparticles–carbon-coated ferroferric oxide (AuNPs-Fe3 [...] Read more.
In this work, a novel electrochemical aptasensor for the detection of ochratoxin A (OTA) was developed using a three-dimensionally ordered macroporous (3DOM) reduced graphene oxide–Au nanoparticles–molybdenum disulfide (RGO-AuNPs-MoS2) composite material as the sensing interface and Au nanoparticles–carbon-coated ferroferric oxide (AuNPs-Fe3O4@C) composite as the signal amplifier. The 3DOM RGO-AuNPs-MoS2 composite exhibited excellent conductivity and catalytic activity. The 3DOM RGO-AuNPs-MoS2 film was electrodeposited onto the Au electrode surface to immobilize DNA capture probe (CP), which was then hybridized with DNA helper strands (HS) and OTA aptamer (OPT) to form a Y-shaped structure. In the presence of OTA, the OPT was released from the electrode and then combined with AuNPs-Fe3O4@C containing the signal DNA1-metheylene blue (S1-MB) and DNA2-metheylene blue (S2-MB). The current response coming from MB was proportional with the OTA concentration. Under optimal conditions, the linear range of the aptasensor was 1 fg/mL to 0.1 μg/mL, with a detection limit as low as 0.56 fg/mL. The aptasensor was also used to detect OTA in rice and wheat samples, and the results were in agreement with those obtained by liquid chromatography-mass spectrometry (HPLC-MS). Full article
(This article belongs to the Special Issue Advances in Photocatalysis and Electrocatalysis Applications)
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11 pages, 2813 KiB  
Article
Laser Irradiation-Induced Pt-Based Bimetallic Alloy Nanostructures without Chemical Reducing Agents for Hydrogen Evolution Reaction
by Taiping Hu, Yisong Fan, Yixing Ye, Yunyu Cai, Jun Liu, Yao Ma, Pengfei Li and Changhao Liang
Catalysts 2023, 13(6), 1018; https://doi.org/10.3390/catal13061018 - 18 Jun 2023
Cited by 2 | Viewed by 1348
Abstract
Binary metallic alloy nanomaterials (NMs) have received significant attention because of their widespread application in photoelectrocatalysis, electronics, and engineering. Although various synthetic methods have been adopted to prepare binary alloy NMs, the formation of bimetallic alloy NMs by irradiating the mixed solutions of [...] Read more.
Binary metallic alloy nanomaterials (NMs) have received significant attention because of their widespread application in photoelectrocatalysis, electronics, and engineering. Although various synthetic methods have been adopted to prepare binary alloy NMs, the formation of bimetallic alloy NMs by irradiating the mixed solutions of metal salts and metal powders, using a nanosecond pulsed laser in the absence of any reducing agent, is rarely reported. Herein, we report a simple method to fabricate PtX (X = Ag, Cu, Co, Ni) alloy NMs by laser irradiation. Taking PtAg alloys as an example, we present the growth dynamics of the PtAg alloys by laser irradiating a mixture solution of bulk Pt and AgNO3. The experimental process and evidenced characterization indicate that the photothermal evaporation induced by laser irradiation can cause the fragmentation of the bulk Pt into smaller parts, which alloy with Ag atoms extracted from Ag+ by solvated electrons (eaq) and free radicals (Haq). These alloys were used as electrocatalysts for the hydrogen evolution reaction (HER), proving their potential application. Notably, in a 0.5 M H2SO4 solution, the PtNi alloy exhibited higher HER activity (44 mV at 10 mA/cm−2) compared to the untreated bulk Pt (72 mV). Our work provides unique insights into the growth processing of valuable Pt-based bimetallic alloy NMs by laser-assisted metallic alloying, which paves a path for the development of bimetallic alloy electrocatalysts. Full article
(This article belongs to the Special Issue Advances in Photocatalysis and Electrocatalysis Applications)
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13 pages, 6826 KiB  
Article
Transcriptomic Analysis of Differentially Expressed Genes in Arabidopsis thaliana Overexpressing BnMYB2 from Boehmeria nivea under Cadmium Stress
by Shoujing Zhu, Wenyang Li, Suhui Yan and Wenjuan Shi
Catalysts 2023, 13(4), 662; https://doi.org/10.3390/catal13040662 - 28 Mar 2023
Viewed by 1170
Abstract
Boehmeria nivea (ramie) is an important fiber crop with strong tolerance to cadmium (Cd). In our previous study, a novel MYB transcription factor gene from ramie, BnMYB2, was found to positively regulate Cd tolerance and accumulation in the transgenic Arabidopsis thaliana lines. [...] Read more.
Boehmeria nivea (ramie) is an important fiber crop with strong tolerance to cadmium (Cd). In our previous study, a novel MYB transcription factor gene from ramie, BnMYB2, was found to positively regulate Cd tolerance and accumulation in the transgenic Arabidopsis thaliana lines. Herein, transcriptome sequencing was performed to identify the differentially expressed genes involved in cadmium response between the wild-type (WT) and BnMYB2 overexpressed lines; 1598 differentially expressed genes (DEGs) were detected in the shoot. GO and KEGG analysis indicated that the majority of DEGs belonged to the categories of transcription factors, plant hormone signal transduction and nitrogen metabolism. The expression level of the Ib subgroup bHLH genes (AtbHLH38, AtbHLH39, AtbHLH100 and AtbHLH101) and nitrogen assimilation-related genes (AtNIA1, AtNIA2, AtNIR1 and AtASN2) were significantly higher than that of WT, accompanied with the positive changes in iron (Fe) and total nitrogen content in the shoot of BnMYB2 overexpression lines. Several DEGs belonging to the bZIP transcription factor family or SAUR family were also found up-regulated in the transgenic plants. These results provide important clues for elucidating how the molecular mechanisms of BnMYB2 regulate plant response to Cd stress. Full article
(This article belongs to the Special Issue Advances in Photocatalysis and Electrocatalysis Applications)
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