Advanced Photo/Electrocatalytic Nanomaterials for Environmental and Energy Applications

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Environmental Nanoscience and Nanotechnology".

Deadline for manuscript submissions: closed (20 September 2024) | Viewed by 1526

Special Issue Editors

School of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Interests: photocatalytic; semiconductor nanomaterials; wastewater treatment; energy and environmental applications
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Guest Editor
School of Life Sciences, Northwestern Polytechnical University, Xi'an, China
Interests: photocatalytic

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Guest Editor
School of Chemistry and Chemical Engineering, Yan'an University, Xi'an, China
Interests: electrochemical energy storage devices; electrochemical sensors; carbon-based nanomaterials

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Guest Editor
School of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Interests: photocatalytic; semiconductor nanomaterials; wastewater treatment; energy and environmental applications
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With the depletion of fossil resources (coal, oil, natural gas), and the environmental pollution caused by the massive use of them, it is urgent to develop renewable energy. The development and utilization of solar energy is of great significance to the energy security and ecological civilization construction of a country. Photo/Electrocatalytic technology, which can directly convert solar energy into high value-added fuel and chemical materials, or degrade a wide range of organic pollutants into easily degradable intermediates or less toxic small molecular substances, is regarded as one of the most important ways to solve the global energy shortage and environmental pollution problem. Photo/Electrocatalytic nanomaterials, such as metal oxides, chalcogenides, chalcohalides, perovskites, transition metal carbide or nitride (MXene), carbon-based materials, and metal-organic frameworks (MOFs) due to the benefits of being easy to separate, absorbing the sunlight, and having numerous active sites have gained significant attention. However, the Photo/Electrocatalytic activity of nanomaterials to date has hardly satisfied the efficiency values required for this promising strategy due to kinetic limitations. The catalyst design, preparation, and modification are proposed to overcome the significant problems existing in the field of modern photo/electrocatalysis. Hence, there are extremely high requirements for the development of efficient photo/electrocatalysts and the understanding of the principle of photo/electrocatalytic water splitting, carbon dioxide reduction, nitrogen reduction, and other processes. This Special Issue will present comprehensive research outlining progress on the application of nanomaterials in photo/electrocatalytic technology. This includes the utilization of modification methods, mechanism exploration, and the construction of new kinds of structures to improve performance in photo/electrocatalytic applications. We invite authors to contribute original research articles and review articles covering the current progress in the field of photo/electrocatalytic nanomaterials.

Dr. Rui Li
Dr. Huibin Ge
Dr. Jian Xuan
Dr. Jianxin Liu
Guest Editors

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Keywords

  • photo/electrocatalytic technology
  • semiconductor nanomaterials
  • solar energy
  • wastewater degradation
  • water splitting
  • hydrogen energy
  • ammonia synthesis

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Published Papers (1 paper)

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Research

32 pages, 6898 KiB  
Article
Hydrogen Production and Li-Ion Battery Performance with MoS2-SiNWs-SWNTs@ZnONPs Nanocomposites
by Abniel Machín, María C. Cotto, Francisco Márquez, Jesús Díaz-Sánchez, Celia Polop and Carmen Morant
Nanomaterials 2024, 14(23), 1911; https://doi.org/10.3390/nano14231911 - 28 Nov 2024
Cited by 1 | Viewed by 1146
Abstract
This study explores the hydrogen generation potential via water-splitting reactions under UV-vis radiation by using a synergistic assembly of ZnO nanoparticles integrated with MoS2, single-walled carbon nanotubes (SWNTs), and crystalline silicon nanowires (SiNWs) to create the MoS2-SiNWs-SWNTs@ZnONPs nanocomposites. A [...] Read more.
This study explores the hydrogen generation potential via water-splitting reactions under UV-vis radiation by using a synergistic assembly of ZnO nanoparticles integrated with MoS2, single-walled carbon nanotubes (SWNTs), and crystalline silicon nanowires (SiNWs) to create the MoS2-SiNWs-SWNTs@ZnONPs nanocomposites. A comparative analysis of MoS2 synthesized through chemical and physical exfoliation methods revealed that the chemically exfoliated MoS2 exhibited superior performance, thereby being selected for all subsequent measurements. The nanostructured materials demonstrated exceptional surface characteristics, with specific surface areas exceeding 300 m2 g−1. Notably, the hydrogen production rate achieved by a composite comprising 5% MoS2, 1.7% SiNWs, and 13.3% SWNTs at an 80% ZnONPs base was approximately 3909 µmol h−1g−1 under 500 nm wavelength radiation, marking a significant improvement of over 40-fold relative to pristine ZnONPs. This enhancement underscores the remarkable photocatalytic efficiency of the composites, maintaining high hydrogen production rates above 1500 µmol h−1g−1 even under radiation wavelengths exceeding 600 nm. Furthermore, the potential of these composites for energy storage and conversion applications, specifically within rechargeable lithium-ion batteries, was investigated. Composites, similar to those utilized for hydrogen production but excluding ZnONPs to address its limited theoretical capacity and electrical conductivity, were developed. The focus was on utilizing MoS2, SiNWs, and SWNTs as anode materials for Li-ion batteries. This strategic combination significantly improved the electronic conductivity and mechanical stability of the composite. Specifically, the composite with 56% MoS2, 24% SiNWs, and 20% SWNTs offered remarkable cyclic performance with high specific capacity values, achieving a complete stability of 1000 mA h g−1 after 100 cycles at 1 A g−1. These results illuminate the dual utility of the composites, not only as innovative catalysts for hydrogen production but also as advanced materials for energy storage technologies, showcasing their potential in contributing to sustainable energy solutions. Full article
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