材料科学
电池(电)
电化学
储能
水溶液
电极
纳米技术
光电子学
化学
量子力学
物理
物理化学
功率(物理)
作者
Xuefeng Zhang,Wei‐Li Song,Mingyong Wang,Jiguo Tu,Handong Jiao,Shuqiang Jiao
标识
DOI:10.1016/j.ensm.2021.12.020
摘要
Rechargeable aqueous batteries, such as metal aluminum ion batteries (AAIBs), are highly desirable for large-scale energy storage owing to their low cost, long-term stability and high safety. As a promising positive electrode material for AAIBs, manganese oxide (n-type semiconductor) presents high operating voltage, good reversibility, and high energy density, while slow kinetics and undesired soluble Mn2+ are major issues for limiting their applications. Here, we demonstrate a highly reversible photo-electrochemical coupling system, where the induced photoelectrons enable for rapid kinetics, fast charging, and enhanced rate performance. The cell under illuminated allows MnO2 for delivering a massively promoted discharge capacity 531 mA h g − 1 (with a specific current of 0.1 A g − 1) along with a high increment of 41.3%, competitive with the record values achieved in the documented AAIBs. Additionally, the generated soluble Mn2+ in discharging process could be oxidized to Mn4+ due to exist of photochemical oxidation behavior, thus further enhancing the charge storage ability. The mechanism of the photo-electrochemical coupling system has been fully understood, which provides a design path for other energy storage systems.
科研通智能强力驱动
Strongly Powered by AbleSci AI