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Synthesis and Purification of Iodoaziridines Involving Quantitative Selection of the Optimal Stationary Phase for Chromatography
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Azopyridine Aqueous Electrochemistry Enables Superior Organic AZIBs
Yihui Xie1, Ming Li1, Yijian Ma1
1School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou 310000, P. R. China.
ACS Applied Materials & Interfaces
|October 23, 2024
Summary
Azopyridine isomers enable the first azo compound (AZO)-based aqueous zinc-ion batteries (AZIBs) with a 1.4 V output. This breakthrough clarifies the energy storage mechanism, significantly enhancing AZIB performance.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Azo compounds (AZO) are explored as organic electrode materials for aqueous zinc-ion batteries (AZIBs).
- Azobenzene cathodes in AZIBs offer low voltage (~0.7 V) and unclear energy storage mechanisms.
- Low voltage and mechanism ambiguity limit practical AZO cathode applications in AZIBs.
Purpose of the Study:
- To investigate azopyridine isomers as AZO cathodes in AZIBs.
- To elucidate the energy storage mechanism of azopyridine cathodes in AZIBs.
- To develop high-voltage AZO-based AZIBs.
Main Methods:
- Aqueous electrochemical studies of azopyridine isomers as cathodes.
- In situ electrochemical characterizations.
- Theoretical computations.
Main Results:
- Azopyridine cathodes exhibit an uplifted redox potential due to electron-withdrawing pyridyl groups and H+-involved redox reactions.
- The first AZO-based AZIB was successfully developed, achieving a 1.4 V output.
- The developed AZIBs are air-stable, offering high energy/power density and a capacity of ~200 mAh g-1.
- Distinct azopyridine electrochemistry was observed in aqueous versus organic electrolytes.
Conclusions:
- Azopyridine isomers represent a promising class of AZO materials for high-performance AZIBs.
- Understanding the electrochemical mechanism is key to designing advanced AZO cathodes.
- This research significantly advances AZO-based energy storage, outperforming previous AZO materials in AZIBs.
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