Abstract Room-temperature successive ionic layer adsorption and reaction (SILAR) electroless chemical method has been proposed for synthesizing Bi2O3, MnO2 and Bi2O3@MnO2 electrode materials over graphite rod. The flake-type Bi2O3 on MnO2 granules increases active sites on preventing the agglomeration of MnO2 to easy and fast electrolyte ions percolation for higher energy storage performance. The X-ray photo-spectroscopy investigation provides the evidence for the formation of the Bi2O3@MnO2 composite matrix. The as-prepared compose electrode material tested for its electrochemical characterizations endows 350 F g−1 of specific capacitance (SC) @10 A g−1 which is better than that of an individual counterpart. Furthermore, the 28 Wh kg−1 energy density at 1395 W kg−1 power density of its symmetric electrochemical supercapatter i.e. summation of battery and supercapacitor performance of the Bi2O3@MnO2//Bi2O3@MnO2 is again superior than that of individuals and also those reported previously for Bi2O3, MnO2 and Bi2O3@MnO2-based symmetric electrochemical storage devices. This enables to light a “CNED” panel designed with 42 LEDs in full-brightness for 45 s, suggesting a commercial potential of the as-obtained electroless Bi2O3@MnO2 composite electrode material in energy storage devices.

中文翻译：

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Bi2O3@MnO2纳米复合材料的简便合成：一种用于高性能超级电容器的有前景的电极

摘要 提出了室温连续离子层吸附反应（SILAR）化学法在石墨棒上合成Bi2O3、MnO2和Bi2O3@MnO2电极材料。MnO2 颗粒上的片状 Bi2O3 增加了活性位点，以防止 MnO2 聚集成容易和快速的电解质离子渗透，从而提高储能性能。X 射线光谱研究为 Bi2O3@MnO2 复合基体的形成提供了证据。所制备的复合电极材料经过电化学特性测试，具有 350 F g-1 的比电容 (SC) @10 A g-1，这优于单个对应物的比电容 (SC)。此外，其对称电化学超级电容器在 1395 W kg-1 功率密度下的 28 Wh kg-1 能量密度，即 Bi2O3@MnO2//Bi2O3@MnO2 的电池和超级电容器性能的总和再次优于个人以及之前报道的基于 Bi2O3、MnO2 和 Bi2O3@MnO2 的对称电化学存储设备的性能。这使得设计有 42 个 LED 的“CNED”面板能够以全亮度点亮 45 秒，表明所获得的化学镀 Bi2O3@MnO2 复合电极材料在储能设备中具有商业潜力。