阴极
电极
水溶液
材料科学
电池(电)
化学工程
催化作用
化学
有机化学
量子力学
物理
工程类
物理化学
功率(物理)
作者
Chunlai Song,Qiang Wang,Rui‐Tao Wen,Qingfeng Tang,Zhiqiang Luo,Zhihao Yuan
标识
DOI:10.1002/smtd.202300809
摘要
Abstract Benzoquinone (BQ) is considered to be a desirable cathode material for aqueous zinc‐based batteries. The major limitations of BQ electrode are the severe sublimation and poor electrical conductivity, which results in serious mass loss during electrode preparation and inferior rate performance. In this study, iodine (I 2 ) species are utilized as an efficient catalyst for the highly reversible conversion of BQ/BQ 2− couple in the Zn‐BQ battery system, wherein N‐doped porous carbon is employed as a host material for anchoring the BQ molecule. In the combination electrode (denoted as BQ‐I@NPC) with 1wt% I 2 additive where I 2 can serve as a carrier to accelerates the Zn 2+ transmission, and reduce the voltage hysteresis of the electrode. As a result, the BQ‐I@NPC cathode delivers a high specific capacity of ≈482 mAh g −1 at 0.25 A g −1 , realizing a high energy density of 545 Wh kg −1 (based on BQ), which is the highest values among reported organic cathode materials for aqueous Zn‐based batteries. Also, a high BQ loading (8 mg cm −2 ) can be attained, and achieving a superior cycling stability with a capacity retention of ≈80% after 20,000 times at 10 C. The work proposes an effective approach toward high performance organic electrode materials.
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