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Metals
Special Issues
Advances in Nanoporous Metallic Materials
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Advances in Nanoporous Metallic Materials

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (30 September 2023) | Viewed by 10061

Special Issue Editors

Prof. Dr. Zhifeng Wang

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, China
Interests: Nanoporous Materials; Dealloying; Battery; Metallic Glass; High Entropy Alloy; Light Metals
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Qibo Deng

E-Mail Website
Guest Editor
School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
Interests: strain engineering of electrocatalysis; dynamic electro-chemo-mechanical analysis; electrochemical actuation; reactivity enhancement strategies; reaction knitics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nanoporous metallic materials (Au, Pd, Cu, Sn, Bi, etc.) have been successfully applied in many fields, such as catalysis, actuation, sensor, energy storage and conversion, and surface-enhanced Raman scattering, due to their high specific surface area, unique bicontinuous structure, tunable ligament/pore size, good conductivity, etc. More and more techniques, including dealloying, templating and electrochemical synthesis, have been used to synthesize nanoporous metals. In addition, a growing number of technologies are combining (for instance, 3D printing combined with dealloying and templating combined with selective corrosion) to design and fabricate new porous structures that exhibit excellent physical and chemical properties.

This Special Issue focuses on recent advances of nanoporous metallic materials by different methods from fundamental studies to various applications. Research areas may include, but are not limited to, structural design of nanoporous metals, novel preparation methods, characterization of nanoporous structures, calculation and simulation toward nanoporous metals and different reaction processes, and applications of nanoporous metallic materials in various fields. It is our pleasure to invite you to submit a manuscript for this Special Issue. Original research papers and review articles are all welcome. We look forward to receiving your contributions.

Prof. Dr. Zhifeng Wang
Prof. Dr. Qibo Deng
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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. Metals 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 2600 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

  • nanoporous metal
  • dealloying
  • energy storage and conversion
  • catalysis
  • actuation
  • sensor
  • mechanical property
  • calculation and simulation
  • surface-enhanced Raman scattering

Published Papers (5 papers)

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Research

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15 pages, 4744 KiB  
Article
Effect of the Gas Temperature on Agglomeration of Au Nanoparticles Synthesized by Spark Discharge and Their Application in Surface-Enhanced Raman Spectroscopy
by Denis Kornyushin, Andrey Musaev, Anton Patarashvili, Arseny Buchnev, Pavel Arsenov, Matthew Ivanov, Olesya Vershinina, Ekaterina Kameneva, Ivan Volkov, Alexey Efimov and Victor Ivanov
Metals 2023, 13(2), 301; https://doi.org/10.3390/met13020301 - 1 Feb 2023
Cited by 1 | Viewed by 1682
Abstract
In this work, we have, for the first time, experimentally verified the hypothesis of reducing the agglomeration rate of aerosol nanoparticles produced by spark discharge upon decreasing the carrier gas temperature in the range of 24 °C to –183 °C. The synthesis of [...] Read more.
In this work, we have, for the first time, experimentally verified the hypothesis of reducing the agglomeration rate of aerosol nanoparticles produced by spark discharge upon decreasing the carrier gas temperature in the range of 24 °C to –183 °C. The synthesis of nanoparticles was implemented as a result of spark ablation of electrodes manufactured from Au with a purity of 99.998% installed in a specially designed gas chamber dipped into liquid nitrogen (−196 °C) to cool down the carrier gas supplied through one of hollow electrodes. It follows from the analysis of transmission electron microscopy images that both the average size of primary nanoparticles and the degree of their sintering become lower if the gas is cooled. For example, in the case of using nitrogen as a carrier gas, the average size of primary nanoparticles decreases from 9.4 nm to 6.6 nm as the gas temperature decreases from 24 °C to –183 °C. This also causes the aggregates to become more branched, manifested by the reduction in their solidity from 92% to 76%. The agglomeration model of Feng based on Smoluchowski theory was employed to calculate particle size distributions that were found to be consistent with the experimental data. The gold nanoparticles synthesized at room and cryogenic temperatures of the carrier gas (N₂, Ar + H₂, He) were used to pattern plasmonic nanostructures on ceramic alumina substrates by using aerosol jet printing technology for the purpose of demonstrating the possibility of their application in surface-enhanced Raman spectroscopy (SERS). The SERS enhancement factor was estimated at 2 × 106 from the analysis of SERS and normal Raman spectra of 1,2-bis(4-pyridyl)ethylene used as an analyte. Full article
(This article belongs to the Special Issue Advances in Nanoporous Metallic Materials)
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15 pages, 11007 KiB  
Article
Potentiostatic Dealloying Fabrication and Electrochemical Actuation Performance of Bulk Nanoporous Palladium
by Fuquan Tan, Bin Yu, Qingguo Bai and Zhonghua Zhang
Metals 2022, 12(12), 2153; https://doi.org/10.3390/met12122153 - 15 Dec 2022
Cited by 4 | Viewed by 1357
Abstract
Metallic actuators increasingly exhibit superiority over conventional actuators (such as piezoelectric ceramics) via low energy consumption and large strain amplitude. Large strain amplitude and high strain energy density (or work density) are required for an actuator with excellent comprehensive performance. Herein, we fabricated [...] Read more.
Metallic actuators increasingly exhibit superiority over conventional actuators (such as piezoelectric ceramics) via low energy consumption and large strain amplitude. Large strain amplitude and high strain energy density (or work density) are required for an actuator with excellent comprehensive performance. Herein, we fabricated bulk nanoporous Pd (np-Pd) with a dense nanoporous structure by two-step potentiostatic dealloying of as-annealed Ni–Pd alloy with chemical corrosion resistance, and investigated the dealloying behaviors as well as electrochemical actuation performance. A visible current density oscillation occurred during dealloying, which is related to formation/dissolution of the passivating film. Additionally, since the dense and continuous ligaments establish a good network connectivity for large strain response, the np-Pd achieves a strain amplitude of up to 3.74% and high strain energy density, which stands out among many actuator materials (e.g., np-AuPt, np-Ni, and np-AlNiCu). Our study provides a useful guidance for fabricating metallic actuators with excellent comprehensive performance. Full article
(This article belongs to the Special Issue Advances in Nanoporous Metallic Materials)
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Review

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23 pages, 6582 KiB  
Review
Dealloyed Nanoporous Gold-Based Materials for Energy Storage and Conversion
by Mengdan Yu, Xiaoyu Wu, Chunling Qin and Zhifeng Wang
Metals 2023, 13(7), 1298; https://doi.org/10.3390/met13071298 - 20 Jul 2023
Cited by 2 | Viewed by 1268
Abstract
The unique bicontinuous porous structure and superior electrical conductivity of nanoporous gold (NPG) make it a highly promising material for energy storage and conversion. Although the number of articles on the study of NPG-based materials in energy fields has increased significantly in recent [...] Read more.
The unique bicontinuous porous structure and superior electrical conductivity of nanoporous gold (NPG) make it a highly promising material for energy storage and conversion. Although the number of articles on the study of NPG-based materials in energy fields has increased significantly in recent years, the collation and review of these articles are still lacking. Herein, we address this gap by reviewing recent research activities on dealloyed NPG for energy storage and conversion applications. Firstly, the typical dealloying process for forming NPG is introduced. Subsequently, NPG-based composite catalysts used to catalyze water splitting and fuel cells electrode reactions are presented. Afterward, the applications of NPG for different types of electrodes of supercapacitors (SCs) and batteries are discussed. Finally, the studies on NPG for catalyzing CO2 reduction reaction (CO2RR) are reviewed. In a word, the recent research progress of NPG-based materials is reviewed and the future research directions are outlined, laying the cornerstone for the preparation of more advanced energy storage and conversion devices in the future. Full article
(This article belongs to the Special Issue Advances in Nanoporous Metallic Materials)
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21 pages, 2193 KiB  
Review
Applications of Nanoporous Gold in Therapy, Drug Delivery, and Diagnostics
by Palak Sondhi, Dhanbir Lingden, Jay K. Bhattarai, Alexei V. Demchenko and Keith J. Stine
Metals 2023, 13(1), 78; https://doi.org/10.3390/met13010078 - 28 Dec 2022
Cited by 9 | Viewed by 2543
Abstract
Nanoporous gold (np-Au) has promising applications in therapeutic delivery. The promises arise from its high surface area-to-volume ratio, ease of tuning shape and size, ability to be modified by organic molecules including drugs, and biocompatibility. Furthermore, np-Au nanostructures can generate the photothermal effect. [...] Read more.
Nanoporous gold (np-Au) has promising applications in therapeutic delivery. The promises arise from its high surface area-to-volume ratio, ease of tuning shape and size, ability to be modified by organic molecules including drugs, and biocompatibility. Furthermore, np-Au nanostructures can generate the photothermal effect. This effect can be used either for controlled release of drugs of therapeutic importance or for destroying cancer cells by heating locally. Despite the enormous potential, the research on the therapeutical use of the np-Au is still in its early stage. In this review, we discuss the current progress and future directions of np-Au for therapeutic applications. Full article
(This article belongs to the Special Issue Advances in Nanoporous Metallic Materials)
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Graphical abstract

18 pages, 2259 KiB  
Review
The Role of the Metal in the Catalytic Reactions of Hydrogenation–Dehydrogenation of Polycyclic Hydrocarbons for Hydrogen Storage
by Leonid M. Kustov and Alexander N. Kalenchuk
Metals 2022, 12(12), 2002; https://doi.org/10.3390/met12122002 - 23 Nov 2022
Cited by 4 | Viewed by 2021
Abstract
The design of benign and safe hydrogen storage systems is the priority in the development of new energy carriers. The storage of hydrogen in a liquid or compressed state, as well as in metal hydrides and adsorbents, depends on pressure and temperature and [...] Read more.
The design of benign and safe hydrogen storage systems is the priority in the development of new energy carriers. The storage of hydrogen in a liquid or compressed state, as well as in metal hydrides and adsorbents, depends on pressure and temperature and under normal conditions does not meet the criteria of the target hydrogen storage capacity, energy consumption for hydrogen storage or safety. The storage of hydrogen in chemical compounds in which it is naturally included in the composition is the only alternative. Aromatic hydrocarbons capable of reversible hydrogenation–dehydrogenation reactions are of the greatest interest among regenerable hydrogen-containing compounds and can be used for hydrogen storage. The role of the metal in the catalytic reactions of the hydrogenation–dehydrogenation of cyclic hydrocarbons for hydrogen storage is discussed in the present review in close relation to the structure and composition of the cyclic substrates. Full article
(This article belongs to the Special Issue Advances in Nanoporous Metallic Materials)
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