In Situ Confinement of Ultrasmall Pd Clusters within Nanosized Silicalite-1 Zeolite for Highly Efficient Catalysis of Hydrogen Generation

Wang, Ning; Sun, Qiming; Bai, Risheng; Li, Xu; Guo, Guanqi; Yu, Jihong

doi:10.1021/jacs.6b03518

Cited by 543 publications

(411 citation statements)

References 41 publications

Supporting

Mentioning

380

Contrasting

Order By: Relevance

“…For this purpose, our group has focused on the investigations of designing and developing highly active MNPs for FADH over the past ten years, the summary of the recent advances in this area may benefit the basic research or the industrial applications of the hydrogen stored in FA in future. [70][71][72] Our group realized that functional amine groups inside the silica pores acted as binding sites for immobilizing Au NPs, resulting . [66,67] In 2011, our group fabricated AuPd alloy NPs on MOF MIL-101 (Cr), a representative MOF having ≈1.2 and 1.6 nm window sizes and ≈2.9 and 3.4 nm mesopores, and its ethylenediamine (ED)-grafted counterpart using a simple liquid impregnation.…”

Section: Heterogeneous Catalystsmentioning

confidence: 99%

Development of Effective Catalysts for Hydrogen Storage Technology Using Formic Acid

Onishi

Iguchi

Yang

et al. 2018

Advanced Energy Materials

122

View full text Add to dashboard Cite

We are engaged in research and development to reduce CO 2 emissions. Longterm increase of CO 2 concentration in the atmosphere has a great influence on climate change. [1] Therefore, developing technologies aiming to reduce CO 2 emissions and to overcome the present society depending on fossil fuels as primary energy. Additionally, transition of fossil fuels into renewable energies is also important for realizing future sustainable society. [2] The most suitable material for this goal is considered to be hydrogen, because its combustion emits only water as a byproduct. In addition, hydrogen possesses almost three times as much energy as natural gases, and can supply electric power very efficiently for fuel cells without releasing greenhouse gases and air pollutants. [3] However, hydrogen also has serious drawbacks for practical applications. Most serious problem is that, hydrogen forms as a gas at ambient conditions with very low density (0.0899 kg m −3 at 0 °C, 0.10 MPa) over ten times lower than air (1.293 kg m −3 at 0 °C, 0.10 MPa). As a result, it becomes difficult to store and transport hydrogen safely. Developing safe and efficient hydrogen storage materials is one of the most difficult challenges for the transformation from the fossil fuel-based economy to hydrogen-based one as a long-term solution for a safe energy future.Hydrogen has attracted considerable attention as an energy source, and various attempts to develop suitable methods for hydrogen generation are made at the National Institute of Advanced Industrial Science and Technology. In this paper, the authors introduce their recent strategies to store hydrogen using formic acid (FA) as a hydrogen carrier. FA, which is believed to be one of the most promising liquid organic hydrogen carriers, can provide a viable method for safe hydrogen transportation. In order to optimize the performance of hydrogen storage with FA, the authors have investigated both homogeneous and heterogeneous catalysts. For example, Ir catalysts anchoring N^N-bidentate ligands show high catalytic activity for both the reactions of FA synthesis and hydrogen generation from FA. Ultrafine Pd-based nanoparticles are also immobilized on various supports, which show excellent catalytic performance for FA dehydrogenation under mild conditions. The authors also develop both homogeneous and heterogeneous catalysts to generate high-pressure gases (H 2 and CO 2 ) over 120 and 35 MPa, respectively,

show abstract

Section: Heterogeneous Catalystsmentioning

confidence: 99%

Development of Effective Catalysts for Hydrogen Storage Technology Using Formic Acid

Onishi

Iguchi

Yang

et al. 2018

Advanced Energy Materials

122

View full text Add to dashboard Cite

show abstract

“…Comparing to Pd@CNP and Pd@XC72, Pd@ SS-CNR with a hierarchical superstructure shows a much higher catalytic activity, which is about 1.8 and 6.3 times to Pd@CNP and Pd@XC72, respectively (Figure 4g). [37][38][39] The excellent catalytic activity for FA dehydrogenation is attributed to the unique features of hierarchical structure. Notably, when the temperature is increased to 60 °C, the reaction can be finished in only 30 s, giving an exceptionally high TOF of 7200 h −1 with 100% H 2 selectivity, which is comparable to the most active heterogeneous catalysts for FA dehydrogenation ( Figure 4h).…”

mentioning

confidence: 99%

Fabrication of a Spherical Superstructure of Carbon Nanorods

et al. 2019

View full text Add to dashboard Cite

superstructure with a large radius of curvature, such as spherical organization, is still a challenge. So far, only a few kinds of 1D oxides could be assembled into 3D spherical superstructures. [13][14][15] Low-dimensional carbon nanomaterials have been widely used in energy storage and conversion owing to their distinct electrochemical properties and mechanical and thermal stability. [16][17][18] 3D superstructures constructed from lowdimensional components such as carbon nanorods/wires or graphene nanorribbons can inherit the exceptional properties of their building blocks and acquire certain unconventional advantages. [19,20] However, the self-assemblies of 1D carbon nanomaterials into 3D ordered spherical superstructures are considerably challenging owing to the reduced accessible contact areas between the building blocks and core templates. Although various synthetic approches have been developed for the synthesis of lowdimensional carbon nanostructures with well-defined size and controllable composition, [21][22][23] no techniques have been applied for controlling the assembly of 1D carbon nanomaterials into 3D spherical superstructure with uniform morphology.Metal-organic frameworks (MOF) are a class of porous crystalline materials that are constructed by metal ions/clusters and organic linkers. [24] The use of MOF as a template or precursor to synthesize carbon nanostructure is an efficient approach to produce carbon materials with controlled morphology and Hierarchical superstructures in nano/microsize have attracted great attention owing to their wide potential applications. Herein, a self-templated strategy is presented for the synthesis of a spherical superstructure of carbon nanorods (SS-CNR) in micrometers through the morphology-preserved thermal transformation of a spherical superstructure of metal-organic framework nanorods (SS-MOFNR). The self-ordered SS-MOFNR with a chestnut-shell-like superstructure composed of 1D MOF nanorods on the shell is synthesized by a hydrothermal transformation process from crystalline MOF nanoparticles. After carbonization in argon, the hierarchical SS-MOFNR transforms into SS-CNR, which preserves the original chestnut-shell-like superstructure with 1D porous carbon nanorods on the shell. Taking the advantage of this functional superstructure, SS-CNR immobilized with ultrafine palladium (Pd) nanoparticles (Pd@SS-CNR) exhibits excellent catalytic activity for formic acid dehydrogenation. This synthetic strategy provides a facile method to synthesize uniform spherical superstructures constructed from 1D MOF nanorods or carbon nanorods for applications in catalysis and energy storage. 3D SuperstructuresHierarchical superstructures are ubiquitous in the biological systems (e.g., proteins, lipids, and carbohydrates). From the aspect of synthesis, self-assembly of simple building blocks into 3D, highly ordered superstructure with novel properties has attracted great interest in the fields of optics, catalysis, and energy storage. [1][2][3][4] Highly organized building bloc...

show abstract

“…[51] In a typical process, 10 mg of PdCl 2 was first dissolved in 20 mL of aqueous HCl (20 %) solution at room temperature under vigorous stirring. [51] In a typical process, 10 mg of PdCl 2 was first dissolved in 20 mL of aqueous HCl (20 %) solution at room temperature under vigorous stirring.…”

Section: In Situ Preparation Of Pd Nanoclusters Encapsulated In Poroumentioning

confidence: 99%

Ultrasmall Palladium Nanoclusters Encapsulated in Porous Carbon Nanosheets for Oxygen Electroreduction in Alkaline Media

Yan

Tang

et al. 2017

ChemElectroChem

View full text Add to dashboard Cite

Ultrasmall noble-metal nanoclusters have been gaining extensive attention because of their unique catalytic activity. Herein, we describe a facile in situ method for the preparation of palladium nanoclusters encapsulated in porous carbon nanosheets as effective catalysts for the oxygen reduction reaction (ORR) in alkaline media. Structural characterizations through Xray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy studies indicate that the Pd clusters were well incorporated into porous carbon nanosheets. The composition of the nanocomposites was manipulated by varying the initial loading ratio of Pd to carbon nanosheets (Pd/ CNS). Among the series of samples tested, the sample at a Pd/ CNS ratio of 1 : 4 (Pd/CNS-20 %) exhibited the best ORR activity with the most positive onset potential and largest diffusionlimited current density, which was even superior to that of commercial Pd black, along with remarkable long-term durability. The findings highlight the unique advantages of employing ultrasmall ligand-free palladium clusters as cost-effective ORR catalysts with high efficiency and remarkable stability.[a] W.

show abstract

In Situ Confinement of Ultrasmall Pd Clusters within Nanosized Silicalite-1 Zeolite for Highly Efficient Catalysis of Hydrogen Generation

Cited by 543 publications

References 41 publications

Development of Effective Catalysts for Hydrogen Storage Technology Using Formic Acid

Development of Effective Catalysts for Hydrogen Storage Technology Using Formic Acid

Fabrication of a Spherical Superstructure of Carbon Nanorods

Ultrasmall Palladium Nanoclusters Encapsulated in Porous Carbon Nanosheets for Oxygen Electroreduction in Alkaline Media

Contact Info

Product

Resources

About