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P-N junction

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...

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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids

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CoNiSe₂ Nanostructures for Clean Energy Production.

Balasubramanian Jansi Rani¹, Ganesan Ravi¹, Rathinam Yuvakkumar¹

¹Nanomaterials Laboratory, Department of Physics, Alagappa University, Karaikudi 630003, Tamil Nadu, India.

|June 30, 2020

Summary

Binary cobalt-nickel selenide (CoNiSe2) electrodes exhibit enhanced oxygen evolution reaction (OER) activity for clean energy production. This novel material demonstrates superior performance compared to individual nickel and cobalt selenides.

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Area of Science:

Materials Science
Electrochemistry
Renewable Energy

Background:

Electrochemical oxygen evolution reaction (OER) is crucial for clean energy technologies like water splitting.
Developing efficient and cost-effective OER electrocatalysts is a key challenge.
Metal selenides are emerging as promising OER catalyst materials.

Purpose of the Study:

To comparatively investigate the OER activity of NiSe2, CoSe2, and CoNiSe2 electrodes.
To explore the structure-activity relationship of these metal selenides.
To assess the potential of binary metal selenides for clean energy applications.

Main Methods:

Synthesis of NiSe2, CoSe2, and CoNiSe2 electrodes via hydrothermal treatment.
Structural characterization using X-ray diffraction (XRD).
Morphological analysis using surface imaging techniques.
Electrochemical performance evaluation in a half-cell configuration.

Main Results:

CoNiSe2 exhibited superior OER activity with a current density of 188 mA/g and a low overpotential of 234 mV.
CoNiSe2 demonstrated higher conductivity and lower charge transfer resistance compared to NiSe2 and CoSe2.
A low Tafel slope of 82 mV/dec was recorded for CoNiSe2.
All fabricated electrodes showed 100% retention in stability tests.

Conclusions:

Binary CoNiSe2 is a highly effective electrocatalyst for the oxygen evolution reaction.
Hydrothermal synthesis provides optimal conditions for producing stable and active metal selenide catalysts.
Affordable binary metal selenides represent a promising avenue for advancing clean energy production.