This book focuses on advanced nanomaterials for energy conversion and storage, covering their design, synthesis, properties and applications in various fields. Developing advanced nanomaterials for high-performance and low-cost energy conversion and storage devices and technologies is of great significance in order to solve the issues of energy crisis and environmental pollution. In this book, various advanced nanomaterials for batteries, capacitors, electrocatalysis, nanogenerators, and magnetic nanomaterials are presented

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This Special Issue reprint, “Advanced Polymer Nanocomposites II”, addresses high-quality original and review papers, focused on the scientific discussion and practical application in the field of functional polymer nanocomposites, including: (a) optoelectronic materials (papers 1-9); (b) biomedical materials (papers 10-14); and (c) other functional polymer nanocomposites (papers 15-23). We hope that this Special Issue reprint can promote academic research exchanges and identify and respond to tremendous challenges of research in this burgeoning field.

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Electrochemical devices have drawn remarkable attention and elicited spectacular growth in recent decades for a broad range of applications, including energy storage, sensing, electrochemical processing, etc. Recent advances in nanomaterials and nanotechnology have boosted great promise for electrochemistry to offer reliable and high-performance devices. This Special Issue, entitled “Advances in Nano-Electrochemical Materials and Devices”, aimed to focus on recent advances in the design, manufacture, and application of nanoelectrochemical materials and devices. This Special Issue included twelve papers, where nine original research papers highlighted novel research progress on advanced nanomaterials and nano-systems for oxygen reduction reactions, batteries, supercapacitors, and sensors. In addition, recent achievements in photocatalysis and electrocatalysis, biosensors, and Li-CO2 batteries were comprehensively summarized in three review papers.

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Catalysts are made of nanoparticles of metals, metal oxides, and other compounds that may act as active phases, support the latter, or a combination of both. The initial incentive to reduce as much as possible, up to the nano-scale, the size of the particles of active catalyst components is to maximize the surface area exposed to reactants, thus minimizing the specific cost per function and increasing the rate of conversion of feedstocks to products in relatively simple reactions. Nowadays, the interest in nanocatalyst developments has shifted to an emphasis on improving the selectivity of catalysts, allowing one to obtain desirable reactions in more complex synthetic processes. Thus, new generations of nanocatalysts should be designed at the molecular level to display well-defined structural characteristics, in terms of size, shapes, hierarchical porosity, and morphologies, as well as with controlled chemical composition. The development of efficient nanocatalysts supposes the characterization of their various surface active sites at the nanometer scale, which is focused on establishing synthesis–structure–performance relationships.

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New carbon materials with improved mechanical, electrical, chemical, and optical properties are predicted and considered to be very promising for practical application. Carbon-based materials in the form of films, fabrics, aerogels, or microstructural materials are known for their large surface areas and pore volumes, light weight, and a great variety of structural morphology. Such unique structures can then be employed for a variety of purposes, for example, the production of new electronic devices, energy storage, and the fabrication of new materials. Nowadays, clear understanding of carbon materials via several examples of synthesis/processing methodologies and properties characterization is required. This Special Issue, “Carbon-Based Materials”, addresses the current state regarding the production and investigation of carbon-based materials. It consists of 13 peer-reviewed papers that cover both theoretical and experimental works in a wide a range of subjects on carbon structures.

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This Special Issue contains some recently experimental and theoretical advances in hydrogen evolution reaction, oxygen evolution reaction, and oxygen reduction reaction, and the applications in water splitting, proton exchange membrane fuel cells, and lithium-ion batteries.

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Carbon materials are one of the most fascinating materials because of their unique properties and potential use in several applications. They can be obtained from residues or by using advanced synthesis technologies like chemical vapor deposition. The carbon family is very broad, ranging from classical activated carbons to more advanced species such as carbon nanotubes and graphene. The surface chemistry is one of the most interesting aspects of this broad family of materials, which allows the incorporation of different types of chemical functionalities or heteroatoms on the carbon surface, such as O, N, B, S, or P, which can modify the acid–base character, hydrophobicity/hydrophilicity, or the electronic properties of these materials and, thus, determine the final application. This book represents a collection of original research articles and communications focused on the synthesis, properties, and applications of heteroatom-doped functional carbon materials.

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ResearchGate academic profile and social networking site for researchers: "Graphene, one of the most interesting and versatile materials of modern times, is recognized for its unique properties, which are strongly different from its bulk counterpart. This discovery has recently stimulated research on other two-dimensional (2D) systems, all consisting of a single layer of atoms. Two-dimensional materials have also emerged as major candidates for use in next-generation applications as a result of the rapid discovery of their any properties. In this Special Issue, we have collected a few recent studies that examine some of these new areas of work in the field of 2D materials."

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This Special Issue reprint covers the most recent advances in nanoalloy electrocatalysts, concerning not only the synthesis, characterization, and modeling, but especially reports of their activity, functionality, durability, and low cost.

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Research on alternative energy harvesting technologies, conversion and storage systems with high efficiency, cost-effective and environmentally friendly systems, such as fuel cells, rechargeable metal-air batteries, unitized regenerative cells, and water electrolyzers has been stimulated by the global demand on energy. The conversion between oxygen and water plays a key step in the development of oxygen electrodes: oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), processes activated mostly by precious metals, like platinum. Their scarcity, their prohibitive cost, and declining activity greatly hamper large-scale applications. This issue reports on novel non-precious metal electrocatalysts based on the innovative design in chemical compositions, structure, and morphology, and supports for the oxygen reaction.

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Currently, cobalt and related catalysts are very attractive as they provide many advantages, such as low cost and high activity, in a variety of applications. Cobalt catalysts are among the most active catalysts for Fischer–Tropsch synthesis and they promote the catalytic activity of the hydrodesulfurization catalysts. They also found other significant applications in environmental protection such as oxidation of volatile organic compounds, VOC, persulfate activator, ammonia synthesis, electrocatalysis and many more. Cobalt catalysts are active, stable and exhibit significant oxidation–reduction activity, as the Co can be found either as Co(II) or Co(III). Additionally, many molecules can interact with the cobalt supported phase by co-ordination due to partially filled d-orbital. Co-catalysts can be supported in almost all the inorganic supports such as alumina, titania, zeolites, etc. The cobalt oxide phase can be stabilized on the surface of the support due to variable interactions between the support and cobalt phase. These interactions are crucial for catalytic activity and can be regulated by proper selection of the preparation parameters such as the type of support, the Co loading, impregnation method and thermal conditions.This Special Issue aims to cover recent progress and advances in the field of cobalt and related catalysts.

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This Special Issue covers solution synthesis, processing, and applications of non-metallic nanomaterials. Zhang et. al. and Jiang et. al. focus on synthesis of kesterite materials, and Wu et. al. and Zhang et. al. focus on synthesis of copper chromium oxide delafossite nanomaterials. Three of these papers discuss solar cell applications using these materials. Yun and Park’s review paper explores the self-assembly of complex nanostructures. Bhalothia et al. show enhanced catalytic activity for NiOx@Pt nanostructures and Wu et. al. report high-sensitivity ammonia sensors made from SnO nanoshells. On flexible electronics, Nakamura et. al. developed Cu nitride ink for rapid photonic processing of conducting lines, Liu et. al. made Au/HfO2/Pt resistive random access memory devices, and Moreira et al. fabricated solution combustion oxide thin film transistors.

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This book is about supramolecular gold chemistry. This book provides a unique international forum aimed at covering a broad description of results involving the supramolecular chemistry of gold with a special focus on the gold–sulfur interface leading to hybrid materials ranging from gold–thiolate complexes to thiolate-protected gold nanoclusters and gold–thiolate supramolecular assemblies or nanoparticles. The role of thiolates on the structure and optical features of gold nanohybrid systems (ranging from plasmonic gold nanoparticles and fluorescent gold nanoclusters to self-assembled Au-containing thiolated coordination polymers) is highlighted in the 12 papers presented in this book.

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Heterogeneous catalysis, exploiting photo- and electrochemical reactions, has expanded rapidly in recent decades, having undergone various developments, especially from both energetic and environmental points of view. Photocatalysis plays a pivotal role in such applications as water splitting and air/water remediation. Electrocatalysis can be found in a large array of research fields, including the development of electroanalytical sensors, wastewater treatment, and energy conversion devices (e.g., batteries, fuel and solar cells, etc.). Therefore, the fine control of the synthetic procedures, together with extensive physicochemical characterisations of the tailor-made catalytic nanomaterials, are of fundamental importance to achieving the desired results. The present book will include recent enhancements in oxide/metal nanoparticles for photocatalytic and electrocatalytic applications, especially in the fields of pollutants abatement and energy conversion.

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"Zeolites and Porous Materials: Applications in Catalysis and Adsorption Processes" provides a comprehensive exploration of the remarkable sphere of zeolites and porous materials, and their wide-ranging applications in catalysis and adsorption processes. Written by experts in the field, this Reprint offers a valuable resource for researchers, scientists, engineers, and students seeking to understand the fundamental principles, synthesis methods, characterization techniques, and cutting-edge applications of these materials. In addition to highlighting achievements and breakthroughs, this Special Issue Reprint addresses the current challenges and future directions in the field. It presents innovative strategies to overcome limitations and paves the way for new research and development opportunities. Furthermore, the Reprint emphasizes the significance of sustainability and green chemistry, demonstrating how zeolites and porous materials can contribute to a more sustainable and environmentally friendly future. Overall, "Zeolites and Porous Materials: Applications in Catalysis and Adsorption Processes" provides an up-to-date examination of zeolites and porous materials. With its diverse perspectives, and its emphasis on cutting-edge applications, this Reprint serves as an invaluable resource for anyone interested in understanding, utilizing, and pushing the boundaries of these exceptional materials.

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