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Inorganics
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Metal Nanomaterials as Efficient Electrocatalysts
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Metal Nanomaterials as Efficient Electrocatalysts

A special issue of Inorganics (ISSN 2304-6740). This special issue belongs to the section "Inorganic Materials".

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 10936

Special Issue Editor

Prof. Dr. Huihui Li

E-Mail Website
Guest Editor
School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
Interests: metal catalysts; electrocatalysis application; surface modification; interface engineering

Special Issue Information

Dear Colleagues,

With the development of controllable synthesis and advanced materials characterization technology, the past decade has witnessed great progress in the synthesis and electrocatalytic applications of metal nanomaterials. The electrocatalytic reactions, such as CO2 reduction reaction, CO reduction reaction, oxygen reduction/evolution reaction, hydrogen evolution/oxidation reaction, nitrogen reduction reaction, are surface sensitive. Various well-defined metal nanomaterials with tailored shape, structure and composition at the atomic scale have been approached and thus provide a desirable platform to establish clear relationships between structure/composition characteristics on the surface/interface and electrocatalytic performance.

This Special Issue aims to track the most recent advances of metal nanomaterials in electrocatalytic applications by hosting a mix of original research articles and short critical reviews.

Prof. Dr. Huihui Li
Guest Editor

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Keywords

  • metal catalysts
  • electrocatalysis application
  • surface modification
  • interface engineering

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Published Papers (4 papers)

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Research

11 pages, 2932 KiB  
Article
Pt Nanoparticles Supported on Ultrathin Ni(OH)2 Nanosheets for Highly Efficient Reduction of 4-Nitrophenol
by Jia-Lin Cui, Zhong-Liang Liu, Hui-Hui Li and Chun-Zhong Li
Inorganics 2023, 11(6), 236; https://doi.org/10.3390/inorganics11060236 - 28 May 2023
Viewed by 1781
Abstract
The synthesis of highly efficient heterogeneous catalysts with uniformly dispersed noble metal particles and a suitable size is crucial for various industrial applications. However, the high cost and rarity of noble metals limit their economic efficiency, making it essential to improve the catalytic [...] Read more.
The synthesis of highly efficient heterogeneous catalysts with uniformly dispersed noble metal particles and a suitable size is crucial for various industrial applications. However, the high cost and rarity of noble metals limit their economic efficiency, making it essential to improve the catalytic performance with lower noble metal loading. Herein, a two-step method was developed for the synthesis of uniformly dispersed ~3 nm Pt nanoparticles (NPs), strongly anchored on Ni(OH)2 nanosheets (NSs), which was proven by adequate structural characterizations. XPS analysis demonstrated that Ni(OH)2 NSs with abundant oxygen vacancies provided sufficient anchor sites for Pt NPs and prevented their agglomeration. The catalytic performance of Ptn/Ni(OH)2 (n (represents the addition amount of Pt precursors during the synthesis, μmol) = 5, 10, 15, and 20) NSs with controllable Pt loading were evaluated via the reduction of 4-nitrophenol to 4-aminophenol as a model reaction. The Pt10/Ni(OH)2 NSs exhibited the best activity and stability, with a reaction rate constant of 0.02358 s−1 and negligible deterioration in ten reaction cycles. This novel synthetic method shows potentials for the synthesis of highly efficient noble-metal-supported catalysts for heterogeneous catalysis. Full article
(This article belongs to the Special Issue Metal Nanomaterials as Efficient Electrocatalysts)
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13 pages, 2377 KiB  
Article
Synthesis, Composition, Structure, and Electrochemical Behavior of Platinum–Ruthenium Catalysts
by Vladislav Menshikov, Kirill Paperzh, Nikita Toporkov and Sergey Belenov
Inorganics 2023, 11(1), 28; https://doi.org/10.3390/inorganics11010028 - 3 Jan 2023
Cited by 3 | Viewed by 1964
Abstract
The bimetallic PtRu nanoparticles deposited on the carbon support with the metals’ atomic ratio of 1:1 have been obtained by different liquid-phase synthesis methods. The metals’ mass fraction in the obtained PtRu/C catalysts is about 27%. The average size of the bimetallic nanoparticles [...] Read more.
The bimetallic PtRu nanoparticles deposited on the carbon support with the metals’ atomic ratio of 1:1 have been obtained by different liquid-phase synthesis methods. The metals’ mass fraction in the obtained PtRu/C catalysts is about 27%. The average size of the bimetallic nanoparticles ranges from 1.9 to 3.9 nm. The activity of the obtained PtRu/C catalysts in the methanol electrooxidation reaction as well as their tolerance to intermediate products of its oxidation have been studied. The sample synthesized by the polyol method has proved to be the most active material. The values of its electrochemical surface area and activity in the methanol electrooxidation reaction are 1.5–1.7 times higher than those of the commercial PtRu/C analogue. Nevertheless, the use of the polyol method leads to losses of the metals during the synthesis. Therefore, this method needs further optimization. Full article
(This article belongs to the Special Issue Metal Nanomaterials as Efficient Electrocatalysts)
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12 pages, 3010 KiB  
Article
Green Synthesis of Silver Nanoparticles Using Artemisia vulgaris Extract and Its Application toward Catalytic and Metal-Sensing Activity
by Achyut Adhikari, Laxman Lamichhane, Anup Adhikari, Gobinda Gyawali, Debendra Acharya, Ek Raj Baral and Kisan Chhetri
Inorganics 2022, 10(8), 113; https://doi.org/10.3390/inorganics10080113 - 4 Aug 2022
Cited by 20 | Viewed by 3698
Abstract
Nonessential heavy metals are toxic to human health. In this study, mercury, a hazardous metal, was detected by colorimetric analysis using Artemisia vulgaris-mediated silver nanoparticles (AgNP) without any modification in an aqueous solution. The UV–vis spectroscopy showed a characteristic SPR band of [...] Read more.
Nonessential heavy metals are toxic to human health. In this study, mercury, a hazardous metal, was detected by colorimetric analysis using Artemisia vulgaris-mediated silver nanoparticles (AgNP) without any modification in an aqueous solution. The UV–vis spectroscopy showed a characteristic SPR band of Ag0 at 418 nm, indicating the formation of AgNPs. The AgNPs were crystalline, with an average size of 7 nm, as calculated from the XRD data. The SEM images revealed the spherical and polycrystalline AgNPs within the agglomerated form. The FTIR spectra elucidated the functional group of the extract attached with the Ag0. The broad, strong peak at 3632 cm−1 indicated the involvement of the -OH group of compounds of extract in reducing silver ions. The peak of EDX spectra around 3 keV confirmed the silver in the nanostructure. A colorimetric method was employed for the heavy metal sensing in the aqueous medium without modification of AgNPs suspension. The obtained AgNPs were found to be selective and highly sensitive toward Hg2+ ions. The AgNPs suspension turned colorless after adding 380 µL of 1 mM Hg2+. The synthesized AgNPs showed the catalytic activity on reduction of 4-nitrophenol in the presence of NaBH4 within 8 min with a rate constant of 1.21 × 10−2 s−1. The outcome of these findings suggests that the application of Artemisia vulgaris influenced AgNPs for metal sensing and green catalysis. Full article
(This article belongs to the Special Issue Metal Nanomaterials as Efficient Electrocatalysts)
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Graphical abstract

14 pages, 2780 KiB  
Article
Electrochemical Redox In-Situ Welding of Silver Nanowire Films with High Transparency and Conductivity
by Wang Zhang, Jiashuan Bao, Chenhui Xu, Pengfeng Zhu, Xiangliang Pan and Rui Li
Inorganics 2022, 10(7), 92; https://doi.org/10.3390/inorganics10070092 - 30 Jun 2022
Cited by 1 | Viewed by 2402
Abstract
Silver nanowire (AgNW) networks with high transparency and conductivity are crucial to developing transparent conductive films (TCFs) for flexible optoelectronic devices. However, AgNW-based TCFs still suffer from the high contact resistance of AgNW junctions with both the in-plane and out-of-plane charge transport barrier. [...] Read more.
Silver nanowire (AgNW) networks with high transparency and conductivity are crucial to developing transparent conductive films (TCFs) for flexible optoelectronic devices. However, AgNW-based TCFs still suffer from the high contact resistance of AgNW junctions with both the in-plane and out-of-plane charge transport barrier. Herein, we report a rapid and green electrochemical redox strategy to in-situ weld AgNW networks for the enhanced conductivity and mechanical durability of TCFs with constant transparency. The welded TCFs show a marked decrease of the sheet resistance (reduced to 45.5% of initial values on average) with high transmittance of 97.02% at 550 nm (deducting the background of substrates). The electrochemical welding treatment enables the removal of the residual polyvinylpyrrolidone layer and the in-situ formation of Ag solder in the oxidation and reduction processes, respectively. Furthermore, local conductivity studies confirm the improvement of both the in-plane and the out-of-plane charge transport by conductive atomic force microscopy. This proposed electrochemical redox method provides new insights on the welding of AgNW-based TCFs with high transparency and low resistance for the development of next-generation flexible optoelectronic devices. Furthermore, such conductive films based on the interconnected AgNW networks can be acted as an ideal supporter to construct heterogeneous structures with other functional materials for wide applications in photocatalysis and electrocatalysis. Full article
(This article belongs to the Special Issue Metal Nanomaterials as Efficient Electrocatalysts)
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