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Radical Formation: Homolysis

Radical Formation: Homolysis

A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.

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Oxyhydroxide Nanosheets with Highly Efficient Electron-Hole Pair Separation for Hydrogen Evolution.

Junheng Huang¹, Qichao Shang², Yuanyuan Huang¹

¹National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230029, P. R. China.

Angewandte Chemie (International Ed. in English)

|January 7, 2016

Summary

Atomically thin β-cobalt oxyhydroxide (β-CoOOH) nanosheets significantly suppress electron-hole recombination, boosting photocatalytic hydrogen production efficiency ten times higher than bulk materials.

Keywords:

XAFS spectroscopy cobalt hydrogen evolution nanosheets

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Area of Science:

Materials Science
Photocatalysis
Nanotechnology

Background:

Electron-hole recombination in transition-metal oxides limits hydrogen evolution photocatalyst efficiency.
Developing efficient and stable photocatalysts from earth-abundant materials is crucial for sustainable hydrogen production.

Purpose of the Study:

To engineer atomically thin, two-dimensional β-CoOOH nanosheets to overcome electron-hole recombination.
To investigate the impact of reduced thickness on the photocatalytic performance for hydrogen evolution.

Main Methods:

Fabrication of layered β-CoOOH into atomically thin nanosheets.
Ultrafast transient absorption spectroscopy to analyze electron-hole recombination dynamics.
X-ray absorption spectroscopy and first-principles calculations to understand surface species and mechanisms.

Main Results:

Achieved 1.3 nm thick β-CoOOH nanosheets with suppressed electron-hole recombination.
Demonstrated electron-hole separation efficiencies of 60-90% (350-450 nm), a tenfold increase over bulk.
Identified [HO-CoO6-x] surface species promoting H+ adsorption and H2 desorption.

Conclusions:

Atomically thin β-CoOOH nanosheets are highly efficient photocatalysts for hydrogen evolution.
The nanostructure design effectively mitigates recombination, enhancing charge separation.
The material shows excellent stability and a high hydrogen production rate (160 μmol g⁻¹ h⁻¹).