Controlled galvanic replacement of Ni in Ni(OH)2 by Pd: A method to quantify metallic Ni and to synthesize bimetallic catalysts for methanol oxidation

Maity, Sisir; Harish, S.; Eswaramoorthy, M.

doi:10.1016/j.matchemphys.2018.09.071

Cited by 10 publications

(4 citation statements)

References 20 publications

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“…What’s more, the XRD pattern of Ni(OH) 2 -Ni 3 Pt (cyan curve in Figure c) is analogous to that of pure Pt NPs (blue curve in Figure c), which confirms the formation of metallic Pt. Besides, the positively shifted Pt peak in Ni(OH) 2 -Ni 3 Pt relative to pure Pt NPs demonstrates the variation of Pt lattice distances and the formation of the NiPt alloy . In short, taking into account the electronic effect between Ni and Pt, as well as the synergistic effect between the NiPt alloy and Ni(OH) 2 substrate, the as-prepared Ni(OH) 2 -Ni 3 Pt heterointerfaces with theoretical-optimum morphology should be promising pH-universal HER electrocatalysts.…”

Section: Resultsmentioning

confidence: 99%

Rapid Synthesis of Nickel Hydroxide/Pt-Based Alloy Heterointerface for Hydrogen Evolution in Full pH Range

Wu,

Zhou,

Liu

et al. 2024

Inorg. Chem.

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The huge application potential of nanoelectrocatalysts can become available only under the condition of scalable and reproducible preparation of nanomaterials (NMs). It is easily overlooked that most of the preparation methods for efficient platinum (Pt)−based electrocatalysts are complicated in process and time-/energy-consuming, which is not conducive to scalable and sustainable production. Herein, we propose a rapid and facile method to in situ construct a heterointerface between nickel hydroxide (Ni(OH) 2 ) and NiPt alloy, in which the preparation steps are easy-to-operate and can be finished in 1 h. Furthermore, the ensemble effect between the Ni(OH) 2 substrate and NiPt active sites benefits the water dissociation process in nonacidic conditions, while the electronic effect in NiPt contributes to the downshifted d-band center of Pt and the proper Gibbs free energy of hydrogen species. As a result, the well-designed and quickly constructed Ni(OH) 2 -Ni 3 Pt heterointerfaces reveal lower overpotentials for HER compared with most reported Pt-based and commercial Pt/C catalysts in nonacidic conditions. This study is expected to provide useful reference information for the development of facile and robust methods for the preparation of more efficient Pt-based electrocatalysts.

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Section: Resultsmentioning

confidence: 99%

Rapid Synthesis of Nickel Hydroxide/Pt-Based Alloy Heterointerface for Hydrogen Evolution in Full pH Range

Wu,

Zhou,

Liu

et al. 2024

Inorg. Chem.

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“…For Ni/Ni(OH) 2 NCs, four diffraction peaks can be observed at 2θ of 33.33°, 44.72°, 51.81°, and 76.27°, corresponding to the reflection planes of Ni(OH) 2 (100), Ni (111), Ni (200), and Ni (220), respectively (JCPDS: 00–001‐1047; 01–087‐0712), which reveals the co‐existence of Ni(OH) 2 and metallic Ni (green curve in Figure 2a). [10a] Besides, the obvious noise and weak characteristic peaks indicate the poor crystallinity and amorphous nature of Ni(OH) 2 substrate [12a] . For pure Pd NPs, five obvious peaks located at 39.73°, 46.24°, 67.87°, 81.94°, and 86.12° are observed, corresponding to reflection planes of Pd (111), Pd (200), Pd (220), Pd (311) and Pd (222), respectively (JCPDS: 00–005‐0681) (blue curve in Figure 2a).…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Multifunctional Ni(OH)₂‐Supported Core‐Shell Ni@Pd Nanocomposites for the Electro‐Oxidation of Small Organic Molecules

Wu,

Zhou,

Zhang

et al. 2023

Chemistry A European J

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In the domain of proton exchange membrane fuel cells (PEMFCs), the development of efficient and durable catalysts for the electro‐oxidation of small organic molecules, especially of alcohols (methanol, ethanol, ethylene glycol, et al.) has always been a hot topic. A large number of related electrocatalysts with splendid performance have been designed and synthesized till now, while the preparation processes of most of them are demanding on experimental operations and conditions. Herein, we put forward a facile and handy method for the preparation of multifunctional Ni(OH)2‐supported core‐shell Ni@Pd nanocomposites (Ni(OH)2/Ni@Pd NCs) with the assistance of galvanic replacement reaction (GRR) at room temperature and ambient pressure. As expected, the Ni(OH)2 substrate can prevent the aggregation of core‐shell (CS) Ni@Pd nanoparticles (NPs) and inhibit the formation of COads and further prevent Pd from being poisoned. The synergistic effect between CS Ni@Pd NPs and Ni(OH)2 substrate and the electronic effect between Pd shell and Ni core contribute to the outstanding electrocatalytic performance for methanol, ethanol, and ethylene glycol oxidation in alkaline condition. This study provides a succinct method for the design and preparation of efficient Pd‐based electrocatalysts for alcohol electro‐oxidation.

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“…The rate of galvanic displacement is usually determined by direct methods, which require an additional experiment for determining the electrolyte and/or coating composition at the point of time when the rate is calculated. Among physical methods we may cite inductively coupled plasma spectroscopy (ICP-AES) [5,30,32] and Rutherford backscattering spectroscopy (RBS). [10] Chemical methods deal with the rate of change in concentration of metal ions in the solution during a given time interval measured by titration.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Potential Scanning as a Novel Approach to Calculation of the Time Variable Galvanic Displacement Reaction Rate

Patsay

Maizelis

2022

ChemElectroChem

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A novel approach to estimate the rate of galvanic displacement reaction was proposed, which allowed the most accurate calculation of the displacement process rate at each moment of time by exact reproducing the open‐circuit conditions. We applied the method for mild steel samples immersed in pyrophosphate‐citrate electrolyte for Cu−Zn alloy electrodeposition. The time dependences of parameters of steel‐electrolyte interaction are obtained. The rate of steel dissolution in open circuit conditions increases by 1.6–2.9 times as compared with corrosion in pyrophosphate‐citrate medium. The results of our approach were verified by an independent experiment using anodic stripping of the obtained deposits.

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Controlled galvanic replacement of Ni in Ni(OH)2 by Pd: A method to quantify metallic Ni and to synthesize bimetallic catalysts for methanol oxidation

Cited by 10 publications

References 20 publications

Rapid Synthesis of Nickel Hydroxide/Pt-Based Alloy Heterointerface for Hydrogen Evolution in Full pH Range

Rapid Synthesis of Nickel Hydroxide/Pt-Based Alloy Heterointerface for Hydrogen Evolution in Full pH Range

Facile Synthesis of Multifunctional Ni(OH)₂‐Supported Core‐Shell Ni@Pd Nanocomposites for the Electro‐Oxidation of Small Organic Molecules

Nonlinear Potential Scanning as a Novel Approach to Calculation of the Time Variable Galvanic Displacement Reaction Rate

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Controlled galvanic replacement of Ni in Ni(OH)2 by Pd: A method to quantify metallic Ni and to synthesize bimetallic catalysts for methanol oxidation

Cited by 10 publications

References 20 publications

Rapid Synthesis of Nickel Hydroxide/Pt-Based Alloy Heterointerface for Hydrogen Evolution in Full pH Range

Rapid Synthesis of Nickel Hydroxide/Pt-Based Alloy Heterointerface for Hydrogen Evolution in Full pH Range

Facile Synthesis of Multifunctional Ni(OH)2‐Supported Core‐Shell Ni@Pd Nanocomposites for the Electro‐Oxidation of Small Organic Molecules

Nonlinear Potential Scanning as a Novel Approach to Calculation of the Time Variable Galvanic Displacement Reaction Rate

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Facile Synthesis of Multifunctional Ni(OH)₂‐Supported Core‐Shell Ni@Pd Nanocomposites for the Electro‐Oxidation of Small Organic Molecules