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Alkali Metals03:06

Alkali Metals

24.3K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
24.3K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

24.1K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
24.1K
Accelerators01:17

Accelerators

279
Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
The effectiveness of calcium chloride can...
279
Bonding in Metals02:32

Bonding in Metals

52.2K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
52.2K
Metallic Solids02:37

Metallic Solids

20.5K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.5K
Accelerating Fluids01:17

Accelerating Fluids

2.3K
When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
The motion of the liquid within this infinitesimal cylinder is considered to obtain the pressure difference. Three vertical forces act on this liquid:
2.3K

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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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A two-dimensional metal-organic framework accelerating visible-light-driven H2 production.

Bingquan Xia1, Jingrun Ran, Shuangming Chen

  • 1School of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia. s.qiao@adelaide.edu.au.

Nanoscale
|April 16, 2019
PubMed
Summary
This summary is machine-generated.

Scientists developed a novel composite material using zinc cadmium sulfide nanoparticles and cobalt-based metal-organic layers for efficient solar hydrogen production. This advancement boosts clean energy technology by enhancing photocatalytic water splitting without expensive noble metals.

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photocatalysis

Background:

  • Growing demand for clean energy sources due to fossil fuel depletion and environmental concerns.
  • Photocatalytic water splitting using solar energy is a promising route for green hydrogen (H2) production.
  • Development of efficient, stable, and cost-effective photocatalysts is crucial for large-scale solar H2 generation.

Purpose of the Study:

  • To fabricate and investigate a novel composite material for enhanced solar-driven hydrogen production.
  • To explore the potential of cobalt-based metal-organic layers (CMLs) as a support and promoter for photocatalysts.
  • To understand the underlying mechanisms responsible for improved photocatalytic activity.

Main Methods:

  • Fabrication of Zn0.8Cd0.2S (ZCS) nanoparticles dispersed in Co-based metal-organic layers (CMLs) via self-assembly.
  • Evaluation of visible-light-induced H2 production activity using advanced characterization techniques.
  • Analysis of electronic interactions between ZCS and CML using synchrotron-based X-ray absorption near edge structure and time-resolved photoluminescence spectroscopy.

Main Results:

  • The synthesized ZCS/CML composite exhibited a significantly enhanced H2 production rate of 18,102 μmol h-1 g-1.
  • This represents a 492% improvement in activity compared to pure ZCS nanoparticles.
  • Advanced characterization revealed strong electronic interactions and abundant reactive sites at the ZCS/CML interface, boosting performance.

Conclusions:

  • The study demonstrates the successful application of earth-abundant CMLs to significantly enhance photocatalytic H2 production without noble metal co-catalysts.
  • The ZCS/CML composite shows great potential for cost-effective and efficient solar-driven hydrogen generation.
  • This work provides insights into designing metal-organic-layer-based materials for energy conversion and storage applications.