Yingying Cai, Lei Sun, Ziwei Chen, Yi Zhang, Hideaki Morikawa, Chunhong Zhu
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引用次数: 0
Abstract
Developing cathode materials with dual redox reactions is an effective strategy to improve the electrochemical performance of aqueous zinc ion batteries (AZIBs), and rational selection of the two electroactive components is the key to achieving this target. Herein, an integrated carbon paper supported Bi/rGO/MnO2 cathode is prepared via a two-step in situ growth process, in which metallic bismuth (Bi) and manganese dioxide (MnO2) are served as two types of electroactive components to realize dual redox reactions. The introduction of reduced graphene oxide (rGO) mitigates the interfacial mismatch of Bi and MnO2, meanwhile further increasing the electrochemical activity by reducing the size of Bi and preventing its self-aggregation. Featuring nanostructured Bi and MnO2, the integrated cathode enables dual redox reactions with enhanced reaction kinetics. This structural and compositional refinement of the Zn//Bi/rGO/MnO2 battery leads to superior electrochemical performance, evidenced by a significant specific capacity (388.3 mAh g−1 at 0.1 A g−1), high energy density (464.6 Wh kg−1) and great rate performance. This work underscores the potential of using MnO2 and Bi as dual electroactive components for AZIBs cathode, providing a pathway towards high performance energy storage systems.
开发具有双重氧化还原反应的阴极材料是提高锌离子水电池(AZIB)电化学性能的有效策略,而合理选择两种电活性成分是实现这一目标的关键。本文通过两步原位生长工艺制备了一种集成碳纸支撑的Bi/rGO/MnO2阴极,其中金属铋(Bi)和二氧化锰(MnO2)作为两种电活性组分实现了双重氧化还原反应。还原氧化石墨烯(rGO)的引入减轻了铋和二氧化锰的界面失配,同时通过减小铋的尺寸和防止其自聚集进一步提高了电化学活性。这种集成阴极具有纳米结构的 Bi 和 MnO2,可实现双重氧化还原反应,并增强反应动力学。Zn//Bi/rGO/MnO2 电池在结构和成分上的改进带来了卓越的电化学性能,具体表现为显著的比容量(0.1 A g-1 时为 388.3 mAh g-1)、高能量密度(464.6 Wh kg-1)和良好的速率性能。这项工作强调了将 MnO2 和 Bi 作为 AZIBs 阴极的双重电活性成分的潜力,为实现高性能储能系统提供了一条途径。
期刊介绍:
Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.