Synthesis of Supported Bimetal Catalysts using Galvanic Deposition Method

Mahara, Yuji; Ohyama, Junya; Sawabe, Kyoichi; Satsuma, Atsushi

doi:10.1002/tcr.201700084

Cited by 6 publications

(4 citation statements)

References 51 publications

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“…The galvanic reduction method was an effective process to get a surface noble metal-rich catalyst [ 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 ]. However, when the pure metallic non-noble metal nanoparticles were used for the galvanic reduction process, the noble metal atoms tended to aggregate into large particles on the surface of the non-noble metal as on other supports.…”

Section: Introductionmentioning

confidence: 99%

Cu@Pd/C with Controllable Pd Dispersion as a Highly Efficient Catalyst for Hydrogen Evolution from Ammonia Borane

et al. 2020

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A series of Cu@Pd/C with different Pd contents was prepared using the galvanic reduction method to disperse Pd on the surface of Cu nanoparticles on Cu/C. The dispersion of Pd was regulated by the Cu(I) on the surface, which was introduced by pulse oxidation. The Cu2O did not react during the galvanic reduction process and restricted the Pd atoms to a specific area. The pulse oxidation method was demonstrated to be an effective process to control the oxidization degree of Cu on Cu/C and then to govern the dispersion of Pd. The catalysts were characterized by transmission electron microscopy (TEM), high-resolution transmission electron microscope (HRTEM), high angular annular dark field scanning TEM (HAADF-STEM), energy-dispersive spectroscopy (EDS) mapping, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), auger electron spectroscopy (AES), and inductively coupled plasma optical emission spectrometer (ICP-OES), which were used to catalyze the hydrogen evolution from ammonia borane. The Cu@Pd/C had much higher activity than the PdCu/C, which was prepared by the impregnation method. The TOF increased as the Cu2O in Cu/C used for the preparation of Cu@Pd/C increased, and the maximum TOF was 465 molH2 min−1 molPd−1 at 298 K on Cu@Pd0.5/C-640 (0.5 wt % of Pd, 640 mL of air was pulsed during the preparation of Cu/C-640). The activity could be maintained in five continuous processes, showing the strong stability of the catalysts.

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Section: Introductionmentioning

confidence: 99%

Cu@Pd/C with Controllable Pd Dispersion as a Highly Efficient Catalyst for Hydrogen Evolution from Ammonia Borane

et al. 2020

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“…Although monometallic catalysts have good catalytic performance in the field of catalysis, the single active site has many limitations in electrochemical NRR. [81][82][83] Bimetallic materials with dual-active-center can significantly improve the catalytic effect through synergistic coupling. Li et al successfully synthesized foordite SnNb 2 O 6 by a two-step hydrothermal approach.…”

Section: P-block Carbon Group Metal-based Catalystsmentioning

confidence: 99%

P‐Block Metal‐Based Electrocatalysts for Nitrogen Reduction to Ammonia: A Minireview

Wang

et al. 2023

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limited total amount and the advancement of mining technology have triggered a booming decline of fossil fuel reserves, resulting in a severe energy depletion crisis. [2][3][4] NH 3 is an essential primary raw material for synthesizing chemicals and fertilizers in the chemical industry. [5,6] Currently, NH 3 production relies on the traditional Haber-Bosch process. [7,8] However, the reaction conditions are very harsh, which entail thermocatalytic conversion of N 2 and H 2 (N 2 + 3H 2 → 2NH 3 , ΔG = −16.48 kJ mol −1 ) under high temperature (≈300-600 °C) and intense pressure (≈15-40 MPa). [9,10] Moreover, the Haber-Bosch process requires complex and extensive production equipment. Recently, the electrochemical nitrogen reduction reaction (NRR) to NH 3 has received tremendous attention due to its merits of energy saving and environmental friendliness, aiming to achieve clean and sustainable production of NH 3 using renewable energy. [11][12][13] Unfortunately, electrochemical NRR is seriously limited by the lack of effective catalysts that can both greatly activate N 2 and suppress the hydrogen evolution reaction (HER). Currently, strategies to solve these problems mainly focus on the design of catalysts to achieve effective activation of N 2 and inhibit the occurrence of HER side reaction. [14,15] Maingroup elements play an essential role in NRR due to various electronic structures. That N 2 molecule can be effectively activated through Lewis acid-based interaction, p electron reverse contribution, heteroatomic doping, and defect engineering. [16] In addition, intrinsically poor proton binding, hydrophobic electrode surface engineering, and alkali metal cation effect can effectively inhibit HER. [17] However, the main-group elements have poor NRR activity. Because of the empty d-orbitals for electron donation and back-donation for N 2 capture and activation, transition metal-based catalysts have been extensively studied for NRR. But the d-orbitals of transition metal-based catalysts and H-s orbital coupling resulted in fierce HER-competition on the catalytic surface, which would not only hindered the active sites of N 2 adsorption but also significantly reduced the Faradaic efficiency (FEs) of the catalyst. [18] Noble metal catalysts have high NH 3 yield and FEs, [19][20][21] but their high price limit applications. In contrast, metal-free electrocatalysts have been explored by more researchers. [22][23][24] Porous metal-free Electrochemical nitrogen reduction reaction (NRR) to ammonia (NH 3 ) using renewable electricity provides a promising approach towards carbon neutral. What's more, it has been regarded as the most promising alternative to the traditional Haber-Bosch route in current context of developing sustainable technologies. The development of a class of highly efficient electrocatalysts with high selectivity and stability is the key to electrochemical NRR. Among them, P-block metal-based electrocatalysts have significant application potential in NRR for which possessing a strong interaction with the N ...

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“…The preparation of TWC catalysts with different structures without changing the composition of the catalyst can improve the catalytic efficiency of TWC. Mahara et al successfully synthesized a Co@Ru/Al 2 O 3 catalyst for automotive ternary reaction via galvanic deposition (GD) as a bimetallization method [94]. As shown in Figure 6a, Ru is concentrated in the shell, and Co is concentrated in the core, and only a small part of Ru and Co form an alloy at the interface.…”

Section: Treatment Of Automobile Exhaustmentioning

confidence: 99%

Dimension Engineering in Noble-Metal-Based Nanocatalysts

Liu,

Yang,

et al. 2023

Catalysts

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Catalysts play a pivotal role in modern industries, such as energy, pharmaceuticals, and petrochemicals, serving as cornerstone of high-tech production. Noble metals, such as gold, silver, and platinum group elements, possess the superb catalytic characteristics of high-temperature oxidation resistance, corrosion resistance, stable electrochemical performance, high catalytic activity, and so on. These characteristics offer excellent prospects for applications in catalysis. In this review, we summarize innovative approaches to regulating the size and morphology of nano-noble metal catalysts with different dimensions. We also showcase typical prominent examples of their applications in exhaust gas purification, battery manufacturing, water splitting, and selective hydrogenation. Finally, perspectives are discussed in terms of future research opportunities in the realm of noble metal nanocatalysts.

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Synthesis of Supported Bimetal Catalysts using Galvanic Deposition Method

Cited by 6 publications

References 51 publications

Cu@Pd/C with Controllable Pd Dispersion as a Highly Efficient Catalyst for Hydrogen Evolution from Ammonia Borane

Cu@Pd/C with Controllable Pd Dispersion as a Highly Efficient Catalyst for Hydrogen Evolution from Ammonia Borane

P‐Block Metal‐Based Electrocatalysts for Nitrogen Reduction to Ammonia: A Minireview

Dimension Engineering in Noble-Metal-Based Nanocatalysts

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