阴极
电池(电)
法拉第效率
电化学
吸附
水溶液
氧化还原
化学
锌
无机化学
化学工程
电极
材料科学
物理化学
有机化学
热力学
功率(物理)
工程类
物理
作者
Na Chen,Weiping Wang,Yirui Ma,Mingyan Chuai,Xusheng Zheng,Mingming Wang,Yan Xu,Yuan Yuan,Jifei Sun,Ké Li,Yahan Meng,Shiou–Ying Cheng,Wei Chen
标识
DOI:10.1002/smtd.202201553
摘要
Abstract Aqueous zinc–chlorine battery with high discharge voltage and attractive theoretical energy density is expected to become an important technology for large‐scale energy storage. However, the practical application of Zn–Cl 2 batteries has been restricted due to the Cl 2 cathode with sluggish kinetics and low Coulombic efficiency (CE). Here, an aqueous Zn–Cl 2 battery using an inexpensive and effective MnO 2 redox adsorbent (referred to Zn‐Cl 2 @MnO 2 battery) to modulate the electrochemical performance of the Cl 2 cathode is developed. Density functional theory calculations reveal that the existence of the intermediate state Cl ads free radical catalyzed by MnO 2 on the Cl 2 cathode contributes to the charge storage capacity, which is the key to modulate the electrode and improve the electrochemical performance. Further analysis of the Cl 2 cathode kinetics discloses the adsorption and catalytic roles of the MnO 2 redox adsorbent. The Zn–Cl 2 @MnO 2 battery displays an enhanced discharge voltage of 2.0 V at a current density of 2.5 mA cm −2 , and stable 1000 cycles with an average CE of 91.6%, much superior to the conventional Zn–Cl 2 battery with an average CE of only 66.8%. The regulation strategy to the Cl 2 cathode provides opportunities for the future development of aqueous Zn‐Cl 2 batteries.
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