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High-Performance Aqueous Zinc-organic Battery with a Photo-responsive Covalent Organic Framework Cathode
Summary:
The authors from Tianjin University of Technology and Nankai University developed a photo-responsive covalent organic framework (NT-COF) cathode material, achieving high performance in aqueous zinc-organic batteries.
Background:
1. To address the problem of low reversible capacity and discharge voltage in COF cathodes for aqueous zinc-ion batteries (ZIBs), previous researchers focused on inorganic materials like manganese oxides and vanadium compounds, achieving certain success but facing challenges such as dissolution and insufficient cycling durability. Organic materials like COFs showed promise but had limitations in conductivity and specific capacity.
2. The authors in this study proposed an innovative donor–acceptor configuration COF (NT-COF) and utilized Mn2+ electrolyte additive to enhance performance, achieving high discharge voltage and capacity.
Research Content:
1. Synthesis:
The authors synthesized the NT-COF using a Schiff base solvothermal condensation method between 1,4,5,8-naphthalene tetracarboxylic dianhydride (MTDA) and tris(4-aminophenyl)amine (TAPA) at 180°C for 72 hours.
2. Characterizations:
1) BET results showed a specific surface area of 825.9 m² g⁻¹ with pore sizes ranging from 2.5 to 3.5 nm.
2) SEM/TEM tests revealed spherical morphology with particle sizes of approximately 100 nm and distinct lattice fringes with an interlayer spacing of 0.29 nm.
3) Other electrochemical tests demonstrated high discharge capacity and voltage plateau, while optical tests confirmed efficient photo-induced electron generation.
3. Application:
The NT-COF cathode was tested in aqueous zinc-organic batteries, achieving a discharge capacity of 214 mAh g⁻¹ at 0.2 A g⁻¹ and an average discharge capacity of 430 mAh g⁻¹ on sunny days under ambient conditions.
4. Mechanism:
The analysis of the experimental results indicated a synergistic combination mechanism involving Zn4SO4(OH)6·4H2O (ZSH) deposition/dissolution reactions and co-(de)insertion reactions of H⁺ and SO4²⁻ in NT-COF. The donor–acceptor configuration facilitated efficient charge separation and reduced charging voltage under light exposure.
Outlook:
This research significantly advances the development of high-energy-density aqueous photo-responsive zinc-organic batteries by utilizing the efficient charge separation properties and high redox activity of the NT-COF cathode, showing promising applications in photo-electrochemical energy storage systems.
High-Performance Aqueous Zinc-organic Battery with a Photo-responsive Covalent Organic Framework Cathode
Authors: Shoucheng Wang, Congcong Zhu, Jiale Ji, Mengyuan Li, Lei Zhao, Fengshi Cai, Zhanliang Tao
DOI: 10.1002/smtd.202400557
Link: https://onlinelibrary.wiley.com/doi/10.1002/smtd.202400557
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