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Reversible electrochemical conversion from selenium to cuprous selenide.

Sean K Sandstrom¹, Heng Jiang¹, Marcos Lucero²

¹Department of Chemistry, Oregon State University, Corvallis, OR, 97331, USA. david.ji@oregonstate.edu.

Chemical Communications (Cambridge, England)

|September 21, 2021

Summary

This summary is machine-generated.

Elemental selenium electrodes host redox-active copper ions through sequential conversion reactions. This process enables a high specific capacity for advanced battery applications.

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Area of Science:

Electrochemistry
Materials Science
Energy Storage

Background:

Developing high-capacity electrode materials is crucial for advancing battery technology.
Selenium-based materials offer potential due to their high theoretical capacities.
Understanding the electrochemical reaction mechanisms is key to optimizing performance.

Purpose of the Study:

To investigate the reversible hosting of redox-active Cu2+/Cu+ ions using elemental selenium as an electrode.
To elucidate the sequential conversion reactions involved in the selenium-copper system.
To determine the specific capacity achievable with this electrode material.

Main Methods:

Utilized elemental selenium as the active electrode material.
Studied the electrochemical reaction pathway involving copper ions (Cu2+/Cu+).
Analyzed the sequential conversion reactions: Se → CuSe → Cu3Se2 → Cu2Se.

Main Results:

Demonstrated reversible hosting of Cu2+/Cu+ ions via sequential conversion reactions.
Observed a four-electron redox process from Se to Cu2Se.
Achieved a high initial specific capacity of 1233 mA h g−1 (based on selenium mass) or 472 mA h g−1 (based on Cu2Se mass).

Conclusions:

Elemental selenium can serve as an effective electrode material for hosting copper ions.
The conversion reaction pathway leads to significant energy storage capacity.
This finding supports the development of high-performance selenium-based batteries.