电化学
氧化还原
阴极
电解质
电子转移
电极
材料科学
硫化铜
化学工程
硫化物
储能
容量损失
电池(电)
标准电极电位
纳米技术
铜
化学
冶金
光化学
功率(物理)
物理
物理化学
量子力学
工程类
作者
Shizhen Li,Zhiquan Wei,Jinlong Yang,Guangming Chen,Zhi Chen,Hongfei Li,Zhuoxin Liu
出处
期刊:ACS Nano
[American Chemical Society]
日期:2023-11-07
卷期号:17 (22): 22478-22487
被引量:3
标识
DOI:10.1021/acsnano.3c05850
摘要
The growing global demand for sustainable and cost-effective energy storage solutions has driven the rapid development of zinc batteries. Despite significant progress in recent years, enhancing the energy density of zinc batteries remains a crucial research focus. One prevalent strategy involves the development of high-capacity and/or high-voltage cathode materials. CuS, a commonly used electrode material, exhibits a two-electron transfer mechanism; however, the reduced sulfion lacks electrochemical activity and thereby limits its discharge capacity and redox potential. In this study, we activate a CuS cathode to form a high-valence Cu2+&S compound using a deep-eutectic-solvent (DES)-based electrolyte. The presence of Cl- in the DES-based electrolyte is crucial to the reversibility of the redox chemistry, and the liquid-phase-involved electrochemical process facilitates redox kinetics. A four-electron transfer pathway involving five reaction steps is identified for the CuS electrode, which unleashes the full electrochemical activity of the S element. Consequently, the full cell delivers a large discharge capacity of ∼800 mAh g-1 at 0.2 A g-1 and yields a high discharge plateau starting at 1.58 V, contributing to energy densities of up to 650 Wh kg-1 (based on CuS). This work offers a promising approach to developing high-energy zinc batteries.
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