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Metal-Based Aerogels and Porous Composites as Efficient Catalysts: Synthesis and...
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Metal-Based Aerogels and Porous Composites as Efficient Catalysts: Synthesis and Catalytic Performance

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

Deadline for manuscript submissions: closed (10 December 2022) | Viewed by 15617

Special Issue Editors

Prof. Dr. Ran Du

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Guest Editor
School of Materials Science & Engineering, Beijing Institute of Technoogy, Beijing 100081, China
Interests: metal aerogels; hydrogels; nanoscience; electrocatalysis; smart materials
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Chengzhou Zhu

grade E-Mail Website
Guest Editor
College of Chemistry, Central China Normal University, Wuhan 430079, China
Interests: atomic scale materials; electrocatalysis; biocatalysis; nanozymes; biosensing
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Bin Cai

E-Mail Website
Guest Editor
School of Chemistry and Chemical Engineering, Shandong University, Jinan, China
Interests: sensor design; bioelectrochemistry; electrocatalysis; aerogel structures
Prof. Dr. Wei Liu

E-Mail Website
Guest Editor
Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, China
Interests: porous materials; composite materials; electrocatalysis; sensors; encryption
Prof. Dr. Dan Wen

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, China
Interests: biosensors; biofuel cells; metal aerogels; electrocatalysis
Prof. Dr. Alexander Eychmüller

E-Mail Website
Guest Editor
Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Dresden, Gerrmany
Interests: synthesis and characterization of nanosized objects and their superstructures together with their photophysical, electrochemical, and structural properties

Special Issue Information

Dear Colleagues,

I am reaching out to let you know that the Special Issue entitled “Metal-based Aerogels and Porous Structures as Efficient Catalysts: Synthesis and Catalytic Performance” has been launched and is waiting for your contributions. Metals, particularly those of nano-size, have been widely recognized for their outstanding intrinsic catalytic activities which are attributed to their broad compositions, highly tunable electronic properties, highly controllable morphology, and remarkable electrical conductivity. Therefore, and for a long time, metal-based materials have played the most important role in diverse fields ranging from the petroleum industry, hydrogen energy, and oxygen electrochemistry to carbon neutralization. To further promote their catalytic potential, engineering bulk metals and metal-based composites into porous nanostructures provides a fascinating route by increasing the number of active sites, facilitating mass transfer, and bringing about intriguing confinement effects. As an example, metal aerogels, which are self-supported porous materials completely made of metals, have obtained much higher activity and durability compared to widespread metal- and non-metal-based catalysts, thanks to the great efforts made in the last decade.

During the journey of pursuing superior metal-based aerogels and porous materials, exploring synthesis methodologies, unveiling catalytic mechanisms, and building up structure/composition-performance correlations are of paramount importance. In light of this, this Special Issue aims to collects both original research and reviews that reflect recent advances (both experimentally and theoretically) or provide new perspectives, particularly in developing syntheses and catalytic-related applications of metal-based aerogels and porous composites. Submissions are welcome (but not limited) in areas such as:

  • Design and synthesis of metal aerogels;
  • Design and synthesis of metal-based porous composites, such as metals supported on carbon aerogels;
  • Theoretical prediction and simulation of the formation process of metal-based porous materials;
  • Design novel metal-based porous materials for catalysis;
  • Experimental or theoretical investigation of catalytic mechanisms with metal-based porous materials;
  • Design metal-based porous materials for new applications.

Submit your paper and select the Journal “Catalysts” and the Special Issue “Metal-Based Aerogels and Porous Composites as Efficient Catalysts: Synthesis and Catalytic Performance” via: MDPI submission system. Please contact the Guest Editor or the journal editor (cicy.chen@mdpi.com) for any queries. Our papers will be published on a rolling basis (accepted papers will be published continuously in the Special Issue (as soon as accepted)) and we will be pleased to receive your submission once you have finished it.

Prof. Dr. Ran Du
Prof. Dr. Chengzhou Zhu
Prof. Dr. Bin Cai
Prof. Dr. Wei Liu
Prof. Dr. Dan Wen
Prof. Dr. Alexander Eychmüller
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. 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

  • metals
  • aerogels
  • porous materials
  • composites
  • nanostructures
  • controlled synthesis
  • catalysis
  • electrocatalysis

Published Papers (6 papers)

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Editorial

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4 pages, 212 KiB  
Editorial
Metal-Based Aerogels and Porous Composites as Efficient Catalysts: Synthesis and Catalytic Performance
by Ran Du and Alexander Eychmüller
Catalysts 2023, 13(11), 1451; https://doi.org/10.3390/catal13111451 - 20 Nov 2023
Viewed by 972
Abstract
Faced with the threat of energy shortage and environment pollution in modern society, the development of efficient and cost-effective catalytic systems is becoming increasingly important [...] Full article
(This article belongs to the Special Issue Metal-Based Aerogels and Porous Composites as Efficient Catalysts: Synthesis and Catalytic Performance)

Research

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8 pages, 2168 KiB  
Article
Facile Synthesis of FeCoNiCuIr High Entropy Alloy Nanoparticles for Efficient Oxygen Evolution Electrocatalysis
by Chen Cai, Zongwei Xin, Xuefan Zhang, Jian Cui, Hui Lv, Wanjie Ren, Cunyuan Gao and Bin Cai
Catalysts 2022, 12(9), 1050; https://doi.org/10.3390/catal12091050 - 15 Sep 2022
Cited by 5 | Viewed by 2536
Abstract
The lack of an efficient and stable electrocatalyst for oxygen evolution reaction (OER) greatly hinders the development of various electrochemical energy conversion and storage techniques. In this study, we report a facile synthesis of FeCoNiCuIr high-entropy alloy nanoparticles (HEA NPs) by a one-step [...] Read more.
The lack of an efficient and stable electrocatalyst for oxygen evolution reaction (OER) greatly hinders the development of various electrochemical energy conversion and storage techniques. In this study, we report a facile synthesis of FeCoNiCuIr high-entropy alloy nanoparticles (HEA NPs) by a one-step heat-up method. The involvement of glucose made the NPs grow uniformly and increased the valence of Ir. The resulting FeCoNiCuIr NPs exhibit excellent OER performance in alkaline solution, with a low overpotential of 360 mV to achieve a current density of 10 mA cm−2 at a Tafel slope of as low as 70.1 mV dec−1. In addition, high stability has also been observed, which remained at 94.2% of the current density after 10 h constant electrolysis, with a constant current of 10 mA cm−2. The high electrocatalytic activity and stability are ascribed to the cocktail effect and synergistic effect between the constituent elements. Our work holds the potential to be extended to the design and synthesis of high-performance electrocatalysts. Full article
(This article belongs to the Special Issue Metal-Based Aerogels and Porous Composites as Efficient Catalysts: Synthesis and Catalytic Performance)
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13 pages, 5365 KiB  
Article
Pt–Pd Bimetallic Aerogel as High-Performance Electrocatalyst for Nonenzymatic Detection of Hydrogen Peroxide
by Chuxuan Pan, Yuanyuan Zheng, Jing Yang, Dongyang Lou, Jian Li, Yujing Sun and Wei Liu
Catalysts 2022, 12(5), 528; https://doi.org/10.3390/catal12050528 - 08 May 2022
Cited by 10 | Viewed by 4720
Abstract
Hydrogen peroxide (H2O2) plays an indispensable role in the biological, medical, and chemical fields. The development of an effective H2O2 detecting method is of great importance. In the present work, a series of PtxPd [...] Read more.
Hydrogen peroxide (H2O2) plays an indispensable role in the biological, medical, and chemical fields. The development of an effective H2O2 detecting method is of great importance. In the present work, a series of PtxPdy bimetallic aerogels and Pt, Pd monometallic aerogels were controllably synthesized by one-step gelation method. Their morphologies and compositions were characterized by transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy, and so forth. These aerogels were used as nonenzyme electrocatalysts for the detection of H2O2. The cyclic voltammetric and amperometric results demonstrated that the performance of the metal aerogels showed volcano-type behavior, with the Pt50Pd50 aerogel sitting on top. The Pt50Pd50 aerogel-based electrochemical sensor exhibited excellent comprehensive performance, with a low overpotential of −0.023 V vs. Ag/AgCl, a broad linear range from 5.1 to 3190 μM (R2 = 0.9980), and a high sensitivity of 0.19 mA mM−1 cm−2, in combination with good anti-interference ability and stability. A comprehensive study indicated that the superior sensing performance of the Pt50Pd50 aerogel is closely related to its optimized d-band center and larger cumulative pore volume. This work first applied Pt–Pd bimetallic aerogels into the detection of H2O2 and shows the promising application of noble metal aerogels in the electrochemical sensing area. Full article
(This article belongs to the Special Issue Metal-Based Aerogels and Porous Composites as Efficient Catalysts: Synthesis and Catalytic Performance)
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12 pages, 2109 KiB  
Article
Expanding the Range: AuCu Metal Aerogels from H2O and EtOH
by Maximilian Georgi, Johannes Kresse, Karl Hiekel, René Hübner and Alexander Eychmüller
Catalysts 2022, 12(4), 441; https://doi.org/10.3390/catal12040441 - 14 Apr 2022
Cited by 3 | Viewed by 2012
Abstract
Due to their self-supporting and nanoparticulate structure, metal aerogels have emerged as excellent electrocatalysts, especially in the light of the shift to renewable energy cycles. While a large number of synthesis parameters have already been studied in depth, only superficial attention has been [...] Read more.
Due to their self-supporting and nanoparticulate structure, metal aerogels have emerged as excellent electrocatalysts, especially in the light of the shift to renewable energy cycles. While a large number of synthesis parameters have already been studied in depth, only superficial attention has been paid to the solvent. In order to investigate the influence of this parameter with respect to the gelation time, crystallinity, morphology, or porosity of metal gels, AuxCuy aerogels were prepared in water and ethanol. It was shown that although gelation in water leads to highly porous gels (60 m2g−1), a CuO phase forms during this process. The undesired oxide could be selectively removed using a post-washing step with formic acid. In contrast, the solvent change to EtOH led to a halving of the gelation time and the suppression of Cu oxidation. Thus, pure Cu aerogels were synthesized in addition to various bimetallic Au3X (X = Ni, Fe, Co) gels. The faster gelation, caused by the lower permittivity of EtOH, led to the formation of thicker gel strands, which resulted in a lower porosity of the AuxCuy aerogels. The advantage given by the solvent choice simplifies the preparation of metal aerogels and provides deeper knowledge about their gelation. Full article
(This article belongs to the Special Issue Metal-Based Aerogels and Porous Composites as Efficient Catalysts: Synthesis and Catalytic Performance)
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16 pages, 3076 KiB  
Article
Selective and Efficient Reduction of Nitrate to Gaseous Nitrogen from Drinking Water Source by UV/Oxalic Acid/Ferric Iron Systems: Effectiveness and Mechanisms
by Zhiyuan Shi, Falu Wang, Qian Xiao, Shuili Yu and Xingli Ji
Catalysts 2022, 12(3), 348; https://doi.org/10.3390/catal12030348 - 18 Mar 2022
Cited by 7 | Viewed by 2138
Abstract
Nitrate (NO3−) reduction in water has been receiving increasing attention in water treatment due to its carcinogenic and endocrine-disrupting properties. This study employs a novel advanced reduction process, the UV/oxalic acid/ferric iron systems (UV/C2O42−/Fe3+ [...] Read more.
Nitrate (NO3−) reduction in water has been receiving increasing attention in water treatment due to its carcinogenic and endocrine-disrupting properties. This study employs a novel advanced reduction process, the UV/oxalic acid/ferric iron systems (UV/C2O42−/Fe3+ systems), in reducing NO3− due to its high reduction efficiency, excellent selectivity, and low treatment cost. The UV/C2O42−/Fe3+ process reduced NO3− with pseudo-first-order reaction rate constants of 0.0150 ± 0.0013 min−1, minimizing 91.4% of 60 mg/L NO3− and reaching 84.2% of selectivity for gaseous nitrogen after 180 min at pHini. 7.0 and 0.5 mg/L dissolved oxygen (DO). Carbon dioxide radical anion (CO2•−) played a predominant role in reducing NO3−. Gaseous nitrogen and NH4+, as well as CO2, were the main nitrogen- and carbon-containing products, respectively, and reduction pathways were proposed accordingly. A suitable level of oxalic acids (3 mM) and NO3− (60 mg/L) was recommended; increasing initial iron concentrations and UV intensity increased NO3− reduction. Instead, increasing the solution pH decreased the reduction, and 0.5–8.0 mg/L DO negligibly affected the process. Moreover, UV/C2O42−/Fe3+ systems were not retarded by 0.1–10 mM SO42− or Cl− or 0.1–1.0 mM HCO3− but were prohibited by 10 mM HCO3− and 30 mg-C/L humic acids. There was a lower reduction of NO3− in simulated groundwater (72.8%) than deionized water after 180 min at pHini. 7.0 and 0.5 mg/L DO, which meets the drinking water standard (<10 mg/L N-NO3−). Therefore, UV/C2O42−/Fe3+ systems are promising approaches to selectively and efficiently reduce NO3− in drinking water. Full article
(This article belongs to the Special Issue Metal-Based Aerogels and Porous Composites as Efficient Catalysts: Synthesis and Catalytic Performance)
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Other

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18 pages, 3230 KiB  
Perspective
A Decade of Electrocatalysis with Metal Aerogels: A Perspective
by Weishan Li, Beibei Weng, Xiaoyue Sun, Bin Cai, René Hübner, Yunjun Luo and Ran Du
Catalysts 2023, 13(1), 167; https://doi.org/10.3390/catal13010167 - 10 Jan 2023
Cited by 4 | Viewed by 2160
Abstract
Nowadays, great efforts have been spent on addressing concerns over energy and environmental crises. Among these efforts, electrocatalysis is widely recognized and studied for its high efficiency and easy processability. As a class of emerging electrocatalysts, metal aerogels (MAs) stand out in the [...] Read more.
Nowadays, great efforts have been spent on addressing concerns over energy and environmental crises. Among these efforts, electrocatalysis is widely recognized and studied for its high efficiency and easy processability. As a class of emerging electrocatalysts, metal aerogels (MAs) stand out in the last decade. In virtue of their three-dimensional conductive pathways, their library of catalytically/optically active sites, and their robust network structures, MAs have unique advantages in electrocatalysis. However, due to the short history of MAs, there is insufficient research on them, leaving significant room for material design and performance optimization. This perspective will mainly focus on electrocatalysis with MAs, aiming to summarize the state-of-the-art progress and to guide the on-target design of efficient MAs-based electrocatalysts towards energy- and environment-related applications. Full article
(This article belongs to the Special Issue Metal-Based Aerogels and Porous Composites as Efficient Catalysts: Synthesis and Catalytic Performance)
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