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WO 3 Nanorods Decorated with Very Small Amount of Pt for Effective Hydrogen Evolution Reaction.

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Title: WO 3 Nanorods Decorated with Very Small Amount of Pt for Effective Hydrogen Evolution Reaction.
Authors: Mineo, Giacometta1,2 (AUTHOR) giacometta.mineo@dfa.unict.it, Bruno, Luca1,2 (AUTHOR) luca.bruno@dfa.unict.it, Bruno, Elena1,2 (AUTHOR) elena.bruno@dfa.unict.it, Mirabella, Salvo1,2 (AUTHOR) salvo.mirabella@dfa.unict.it
Source: Nanomaterials (2079-4991). Mar2023, Vol. 13 Issue 6, p1071. 10p.
Subjects: Hydrogen evolution reactions, Rutherford backscattering spectrometry, Nanorods, Transition metal oxides, Nanoparticles, Platinum nanoparticles
Abstract: The electrochemical hydrogen evolution reaction (HER) is one of the most promising green methods for the efficient production of renewable and sustainable H2, for which platinum possesses the highest catalytic activity. Cost-effective alternatives can be obtained by reducing the Pt amount and still preserving its activity. The Pt nanoparticle decoration of suitable current collectors can be effectively realized by using transition metal oxide (TMO) nanostructures. Among them, WO3 nanorods are the most eligible option, thanks to their high stability in acidic environments, and large availability. Herein, a simple and affordable hydrothermal route is used for the synthesis of hexagonal WO3 nanorods (average length and diameter of 400 and 50 nm, respectively), whose crystal structure is modified after annealing at 400 °C for 60 min, to obtain a mixed hexagonal/monoclinic crystal structure. These nanostructures were investigated as support for the ultra-low-Pt nanoparticles (0.2–1.13 μg/cm2): decoration occurs by drop casting some drops of a Pt nanoparticle aqueous solution and the electrodes were tested for the HER in acidic environment. Pt-decorated WO3 nanorods were characterized by performing scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), Rutherford backscattering spectrometry (RBS), linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) and chronopotentiometry. HER catalytic activity is studied as a function of the total Pt nanoparticle loading, thus obtaining an outstanding overpotential of 32 mV at 10 mA/cm2, a Tafel slope of 31 mV/dec, a turn-over frequency of 5 Hz at −15 mV, and a mass activity of 9 A/mg at 10 mA/cm2 for the sample decorated with the highest Pt amount (1.13 μg/cm2). These data show that WO3 nanorods act as excellent supports for the development of an ultra-low-Pt-amount-based cathode for efficient and low-cost electrochemical HER. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: WO 3 Nanorods Decorated with Very Small Amount of Pt for Effective Hydrogen Evolution Reaction.
– Name: Author
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  Data: <searchLink fieldCode="AR" term="%22Mineo%2C+Giacometta%22">Mineo, Giacometta</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> giacometta.mineo@dfa.unict.it</i><br /><searchLink fieldCode="AR" term="%22Bruno%2C+Luca%22">Bruno, Luca</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> luca.bruno@dfa.unict.it</i><br /><searchLink fieldCode="AR" term="%22Bruno%2C+Elena%22">Bruno, Elena</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> elena.bruno@dfa.unict.it</i><br /><searchLink fieldCode="AR" term="%22Mirabella%2C+Salvo%22">Mirabella, Salvo</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> salvo.mirabella@dfa.unict.it</i>
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  Data: <searchLink fieldCode="JN" term="%22Nanomaterials+%282079-4991%29%22">Nanomaterials (2079-4991)</searchLink>. Mar2023, Vol. 13 Issue 6, p1071. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Hydrogen+evolution+reactions%22">Hydrogen evolution reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Rutherford+backscattering+spectrometry%22">Rutherford backscattering spectrometry</searchLink><br /><searchLink fieldCode="DE" term="%22Nanorods%22">Nanorods</searchLink><br /><searchLink fieldCode="DE" term="%22Transition+metal+oxides%22">Transition metal oxides</searchLink><br /><searchLink fieldCode="DE" term="%22Nanoparticles%22">Nanoparticles</searchLink><br /><searchLink fieldCode="DE" term="%22Platinum+nanoparticles%22">Platinum nanoparticles</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The electrochemical hydrogen evolution reaction (HER) is one of the most promising green methods for the efficient production of renewable and sustainable H2, for which platinum possesses the highest catalytic activity. Cost-effective alternatives can be obtained by reducing the Pt amount and still preserving its activity. The Pt nanoparticle decoration of suitable current collectors can be effectively realized by using transition metal oxide (TMO) nanostructures. Among them, WO3 nanorods are the most eligible option, thanks to their high stability in acidic environments, and large availability. Herein, a simple and affordable hydrothermal route is used for the synthesis of hexagonal WO3 nanorods (average length and diameter of 400 and 50 nm, respectively), whose crystal structure is modified after annealing at 400 °C for 60 min, to obtain a mixed hexagonal/monoclinic crystal structure. These nanostructures were investigated as support for the ultra-low-Pt nanoparticles (0.2–1.13 μg/cm2): decoration occurs by drop casting some drops of a Pt nanoparticle aqueous solution and the electrodes were tested for the HER in acidic environment. Pt-decorated WO3 nanorods were characterized by performing scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), Rutherford backscattering spectrometry (RBS), linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) and chronopotentiometry. HER catalytic activity is studied as a function of the total Pt nanoparticle loading, thus obtaining an outstanding overpotential of 32 mV at 10 mA/cm2, a Tafel slope of 31 mV/dec, a turn-over frequency of 5 Hz at −15 mV, and a mass activity of 9 A/mg at 10 mA/cm2 for the sample decorated with the highest Pt amount (1.13 μg/cm2). These data show that WO3 nanorods act as excellent supports for the development of an ultra-low-Pt-amount-based cathode for efficient and low-cost electrochemical HER. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/nano13061071
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      – Code: eng
        Text: English
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      – SubjectFull: Hydrogen evolution reactions
        Type: general
      – SubjectFull: Rutherford backscattering spectrometry
        Type: general
      – SubjectFull: Nanorods
        Type: general
      – SubjectFull: Transition metal oxides
        Type: general
      – SubjectFull: Nanoparticles
        Type: general
      – SubjectFull: Platinum nanoparticles
        Type: general
    Titles:
      – TitleFull: WO 3 Nanorods Decorated with Very Small Amount of Pt for Effective Hydrogen Evolution Reaction.
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            NameFull: Mineo, Giacometta
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            NameFull: Bruno, Luca
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            NameFull: Bruno, Elena
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            – D: 15
              M: 03
              Text: Mar2023
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              Y: 2023
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