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  1. Article: Fe,Ni-Based Metal-Organic Frameworks Embedded in Nanoporous Nitrogen-Doped Graphene as a Highly Efficient Electrocatalyst for the Oxygen Evolution Reaction.

    Tang, Panjuan / Di Vizio, Biagio / Yang, Jijin / Patil, Bhushan / Cattelan, Mattia / Agnoli, Stefano

    Nanomaterials (Basel, Switzerland)

    2024  Volume 14, Issue 9

    Abstract: The quest for economically sustainable electrocatalysts to replace critical materials in anodes for the oxygen evolution reaction (OER) is a key goal in electrochemical conversion technologies, and, in this context, metal-organic frameworks (MOFs) offer ... ...

    Abstract The quest for economically sustainable electrocatalysts to replace critical materials in anodes for the oxygen evolution reaction (OER) is a key goal in electrochemical conversion technologies, and, in this context, metal-organic frameworks (MOFs) offer great promise as alternative electroactive materials. In this study, a series of nanostructured electrocatalysts was successfully synthesized by growing tailored Ni-Fe-based MOFs on nitrogen-doped graphene, creating composite systems named MIL-NG-n. Their growth was tuned using a molecular modulator, revealing a non-trivial trend of the properties as a function of the modulator quantity. The most active material displayed an excellent OER performance characterized by a potential of 1.47 V (vs. RHE) to reach 10 mA cm
    Language English
    Publishing date 2024-04-25
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano14090751
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  2. Article ; Online: Au-Ag Alloy Nanocorals with Optimal Broadband Absorption for Sunlight-Driven Thermoplasmonic Applications.

    Pini, Federico / Pilot, Roberto / Ischia, Gloria / Agnoli, Stefano / Amendola, Vincenzo

    ACS applied materials & interfaces

    2022  Volume 14, Issue 25, Page(s) 28924–28935

    Abstract: Noble metal nanoparticles are efficient converters of light into heat but typically cover a limited spectral range or have intense light scattering, resulting in unsuited for broadband thermoplasmonic applications and sunlight-driven heat generation. ... ...

    Abstract Noble metal nanoparticles are efficient converters of light into heat but typically cover a limited spectral range or have intense light scattering, resulting in unsuited for broadband thermoplasmonic applications and sunlight-driven heat generation. Here, Au-Ag alloy nanoparticles were deliberately molded with an irregular nanocoral (NC) shape to obtain broadband plasmon absorption from the visible to the near-infrared yet at a lower cost compared to pure Au nanostructures. The Au-Ag NCs are produced through a green and scalable methodology that relies on pulsed laser fragmentation in a liquid, without chemicals or capping molecules, leaving the particles surface free for conjugation with thiolated molecules and enabling full processability and easy inclusion in various matrixes. Numerical calculations showed that panchromism, i.e., the occurrence of a broadband absorption from the visible to the near-infrared region, is due to the special morphology of Au-Ag alloy NCs and consists of a purely absorptive behavior superior to monometallic Au or Ag NCs. The thermoplasmonic properties were assessed by multiwavelength light-to-heat conversion experiments and exploited for the realization of a cellulose-based solar-steam generation device with low-cost, simple design but competitive performances. Overall, here it is shown how laser light can be used to harvest solar light. Besides, the optimized broadband plasmon absorption, the green synthetic procedure, and the other set of positive features for thermoplasmonic applications of Au-Ag NCs will contribute to the development of environmentally friendly devices of practical utility in a sustainable world.
    Language English
    Publishing date 2022-06-17
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.2c05983
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  3. Article: Au–Ag Alloy Nanocorals with Optimal Broadband Absorption for Sunlight-Driven Thermoplasmonic Applications

    Pini, Federico / Pilot, Roberto / Ischia, Gloria / Agnoli, Stefano / Amendola, Vincenzo

    ACS applied materials & interfaces. 2022 June 17, v. 14, no. 25

    2022  

    Abstract: Noble metal nanoparticles are efficient converters of light into heat but typically cover a limited spectral range or have intense light scattering, resulting in unsuited for broadband thermoplasmonic applications and sunlight-driven heat generation. ... ...

    Abstract Noble metal nanoparticles are efficient converters of light into heat but typically cover a limited spectral range or have intense light scattering, resulting in unsuited for broadband thermoplasmonic applications and sunlight-driven heat generation. Here, Au–Ag alloy nanoparticles were deliberately molded with an irregular nanocoral (NC) shape to obtain broadband plasmon absorption from the visible to the near-infrared yet at a lower cost compared to pure Au nanostructures. The Au–Ag NCs are produced through a green and scalable methodology that relies on pulsed laser fragmentation in a liquid, without chemicals or capping molecules, leaving the particles surface free for conjugation with thiolated molecules and enabling full processability and easy inclusion in various matrixes. Numerical calculations showed that panchromism, i.e., the occurrence of a broadband absorption from the visible to the near-infrared region, is due to the special morphology of Au–Ag alloy NCs and consists of a purely absorptive behavior superior to monometallic Au or Ag NCs. The thermoplasmonic properties were assessed by multiwavelength light-to-heat conversion experiments and exploited for the realization of a cellulose-based solar-steam generation device with low-cost, simple design but competitive performances. Overall, here it is shown how laser light can be used to harvest solar light. Besides, the optimized broadband plasmon absorption, the green synthetic procedure, and the other set of positive features for thermoplasmonic applications of Au–Ag NCs will contribute to the development of environmentally friendly devices of practical utility in a sustainable world.
    Keywords absorption ; alloy nanoparticles ; alloys ; heat ; light intensity ; liquids ; solar radiation
    Language English
    Dates of publication 2022-0617
    Size p. 28924-28935.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1944-8252
    DOI 10.1021/acsami.2c05983
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Oxidized multiwalled nanotubes as efficient carbocatalyst for the general synthesis of azines

    Valle-Amores, Miguel A. / Blanco, Matías / Agnoli, Stefano / Fraile, Alberto / Alemán, José

    Journal of catalysis. 2022 Feb., v. 406

    2022  

    Abstract: The carbocatalytic synthesis of azines (N-N linked diimines) by mild-oxidized multiwalled carbon nanotubes catalyst (oxMWNT) is presented. The material, just with a 5 %wt. loading, is able to carry out a smooth room-temperature metal-free condensation of ...

    Abstract The carbocatalytic synthesis of azines (N-N linked diimines) by mild-oxidized multiwalled carbon nanotubes catalyst (oxMWNT) is presented. The material, just with a 5 %wt. loading, is able to carry out a smooth room-temperature metal-free condensation of aldehydes and hydrazine, without external additives, to obtain a wide library of symmetric and also asymmetric azines in excellent yields, even in gram scale, with an excellent selectivity for aromatic substrates. This methodology allows the synthesis of azines with application in nonlinear optics, and the organic materials and biological active compounds crafting. oxMWNT catalysed the reaction in just 3 h with full recyclability upon the recovery of the catalyst. In addition, due to the inherent oxMWNT oxidative capacity in the presence of nitric acid, we have also developed the one-pot synthesis of azines starting from alcohols.
    Keywords ambient temperature ; azines ; carbon nanotubes ; catalysts ; catalytic activity ; hydrazine ; nitric acid ; optics ; oxidation ; synthesis
    Language English
    Dates of publication 2022-02
    Size p. 174-183.
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 1468993-5
    ISSN 1090-2694 ; 0021-9517
    ISSN (online) 1090-2694
    ISSN 0021-9517
    DOI 10.1016/j.jcat.2022.01.009
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  5. Article ; Online: Fundamentals of chemical functionalities at oxide interfaces.

    Agnoli, Stefano / Batzill, Matthias

    Journal of physics. Condensed matter : an Institute of Physics journal

    2018  Volume 30, Issue 17, Page(s) 170301

    Language English
    Publishing date 2018-03-20
    Publishing country England
    Document type Introductory Journal Article
    ZDB-ID 1472968-4
    ISSN 1361-648X ; 0953-8984
    ISSN (online) 1361-648X
    ISSN 0953-8984
    DOI 10.1088/1361-648X/aab816
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: The Effect of the 3D Nanoarchitecture and Ni-Promotion on the Hydrogen Evolution Reaction in MoS

    Ran, Jiajia / Girardi, Leonardo / Dražić, Goran / Wang, Zhanhua / Agnoli, Stefano / Xia, Hesheng / Granozzi, Gaetano

    Small (Weinheim an der Bergstrasse, Germany)

    2022  Volume 18, Issue 14, Page(s) e2105694

    Abstract: The transition toward renewable energy sources requires low-cost, efficient, and durable electrocatalysts for green ... ...

    Abstract The transition toward renewable energy sources requires low-cost, efficient, and durable electrocatalysts for green H
    Language English
    Publishing date 2022-03-06
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2168935-0
    ISSN 1613-6829 ; 1613-6810
    ISSN (online) 1613-6829
    ISSN 1613-6810
    DOI 10.1002/smll.202105694
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  7. Article: Nanoneedles of Mixed Transition Metal Phosphides as Bifunctional Catalysts for Electrocatalytic Water Splitting in Alkaline Media.

    Salvò, Davide / Mosconi, Dario / Neyman, Alevtina / Bar-Sadan, Maya / Calvillo, Laura / Granozzi, Gaetano / Cattelan, Mattia / Agnoli, Stefano

    Nanomaterials (Basel, Switzerland)

    2023  Volume 13, Issue 4

    Abstract: In this work, mixed Ni/Co and Ni/Fe metal phosphides with different metal ratios were synthesized through the phosphidization of high-surface-area hydroxides grown hydrothermally on carbon cloth. The materials were characterized by means of X-ray ... ...

    Abstract In this work, mixed Ni/Co and Ni/Fe metal phosphides with different metal ratios were synthesized through the phosphidization of high-surface-area hydroxides grown hydrothermally on carbon cloth. The materials were characterized by means of X-ray photoemission spectroscopy, X-ray diffraction, energy dispersive X-ray analysis, and electron microscopies. The electrocatalytic performance in the electrochemical water splitting was tested in alkaline media. With the aim of determining the chemical stability of the mixed phosphides and the possible changes undergone under catalytic conditions, the materials were characterized before and after the electrochemical tests. The best performances in the hydrogen evolution reaction were achieved when synergic interactions are established among the metal centers, as suggested by the outstanding performances (50 mV to achieve 10 mA/cm
    Language English
    Publishing date 2023-02-09
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano13040683
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  8. Article: Catalytic Activity of Defect-Engineered Transition Me tal Dichalcogenides Mapped with Atomic-Scale Precision by Electrochemical Scanning Tunneling Microscopy.

    Lunardon, Marco / Kosmala, Tomasz / Ghorbani-Asl, Mahdi / Krasheninnikov, Arkady V / Kolekar, Sadhu / Durante, Christian / Batzill, Matthias / Agnoli, Stefano / Granozzi, Gaetano

    ACS energy letters

    2023  Volume 8, Issue 2, Page(s) 972–980

    Abstract: Unraveling structure-activity relationships is a key objective of catalysis. Unfortunately, the intrinsic complexity and structural heterogeneity of materials stand in the way of this goal, mainly because the activity measurements are area-averaged and ... ...

    Abstract Unraveling structure-activity relationships is a key objective of catalysis. Unfortunately, the intrinsic complexity and structural heterogeneity of materials stand in the way of this goal, mainly because the activity measurements are area-averaged and therefore contain information coming from different surface sites. This limitation can be surpassed by the analysis of the noise in the current of electrochemical scanning tunneling microscopy (EC-STM). Herein, we apply this strategy to investigate the catalytic activity toward the hydrogen evolution reaction of monolayer films of MoSe
    Language English
    Publishing date 2023-01-16
    Publishing country United States
    Document type Journal Article
    ISSN 2380-8195
    ISSN 2380-8195
    DOI 10.1021/acsenergylett.2c02599
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  9. Article: Doping graphene with boron: a review of synthesis methods, physicochemical characterization, and emerging applications

    Agnoli, Stefano / Favaro, Marco

    Journal of materials chemistry A. 2016 Mar. 29, v. 4, no. 14

    2016  

    Abstract: Graphene based materials can be effectively modified by doping in order to specifically tailor their properties toward specific applications. So far the most used and widely investigated dopant heteroatom is probably nitrogen. However, boron is also an ... ...

    Abstract Graphene based materials can be effectively modified by doping in order to specifically tailor their properties toward specific applications. So far the most used and widely investigated dopant heteroatom is probably nitrogen. However, boron is also an equally important element that can induce novel and complementary properties leading to specific implementation in alternative devices and technologies. In this paper, we survey the most recent preparation methods of boron doped graphene, including materials with specific morphology such as nanoribbons, quantum dots and 3D interconnected systems. We illustrate the results of theoretical and experimental studies dealing with the description and understanding of the main structural, electronic and chemical properties of this material. The emerging applications of boron doped graphene in several technological fields such as electrochemistry, sensors, photovoltaics, catalysis and biology are extensively reviewed.
    Keywords boron ; catalytic activity ; electrochemistry ; graphene ; nitrogen ; physicochemical properties ; quantum dots ; solar energy ; surveys
    Language English
    Dates of publication 2016-0329
    Size p. 5002-5025.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/c5ta10599d
    Database NAL-Catalogue (AGRICOLA)

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  10. Article: Electrocatalytic hydrogen evolution using hybrid electrodes based on single-walled carbon nanohorns and cobalt(ii) polypyridine complexes

    Benazzi, Elisabetta / Begato, Federico / Niorettini, Alessandro / Destro, Lorenza / Wurst, Klaus / Licini, Giulia / Agnoli, Stefano / Zonta, Cristiano / Natali, Mirco

    Journal of materials chemistry A. 2021 Sept. 14, v. 9, no. 35

    2021  

    Abstract: The generation of hydrogen from water represents an important task towards a carbon neutral economy. Within this context, the preparation of hybrid electrodes merging the versatility of solid-state porous substrates and the catalytic ability and ... ...

    Abstract The generation of hydrogen from water represents an important task towards a carbon neutral economy. Within this context, the preparation of hybrid electrodes merging the versatility of solid-state porous substrates and the catalytic ability and tunability of molecular complexes represents a great challenge. In the present work, we report on the preparation of hybrid cathodes for the hydrogen evolution reaction (HER) through an unprecedented combination of single-walled carbon nanohorns (SWCNHs) and two novel cobalt(ii) polypyridine complexes based on the tris(2-pyridylmethyl)amine (TPMA) ligand scaffold. Suitable pyrene groups are introduced in the ligand framework in different positions to provide a way for direct anchoring onto the carbonaceous substrate by exploiting non-covalent π–π interactions. The present systems behave as competent cathodes for the HER in neutral aqueous solution with overpotentials of η ∼ 0.5 V and stable current densities (within 1 h electrolysis) up to −0.50 mA cm⁻², whose exact values depend on the catalyst used and are mainly related to the respective loading on the electrode surface. In both cases, hydrogen evolution is detected under continuous electrolysis for up to ca. 12 h leading to maximum turnover numbers (TONs) of 4700 and 9180 molH₂ molCₒ⁻¹ for the two different complexes. The progressive deactivation under electrolytic conditions is mainly ascribed to leaching of the metal centre from the polydentate ligand, likely occurring from the competent catalytic intermediates involved in the HER.
    Keywords aqueous solutions ; carbon ; catalysts ; cobalt ; electrolysis ; hydrogen production ; ligands
    Language English
    Dates of publication 2021-0914
    Size p. 20032-20039.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/d1ta03645a
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