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Growth of NiMn layered double hydroxide and polypyrrole on bacterial cellulose nanofibers for efficient supercapacitors
Electrochimica Acta ( IF 6.6 ) Pub Date : 2018-10-16 , DOI: 10.1016/j.electacta.2018.10.090
Yan Yuan , Jie Zhou , Muhammad Imran Rafiq , Simeng Dai , Jian Tang , Weihua Tang

Bacterial cellulose (BC) is an appealing biomass for developing functional electrodes with multiple components along their cross-linked nanofibers. Herein, we demonstrate a BC-directed ternary composite through the successive layer-assembly of polypyrrole (PPy) and bimetallic hydroxide (NiMn-LDH). In our strategy, both in-situ layer-by-layer depositions have been realized at mild conditions (≤25 °C). By tailoring the feeding weights of PPy/BC in NiMn-LDH precursor solutions, the ternary composites the maximum loading of NiMn-LDH has achieved with the highest specific surface. The optimized BC-based electrode material delivers a specific capacity of 653.1 C g−1 at a current density of 1.0 A g−1. Hybrid supercapacitor by assembling NiMn-LDH/PPy/BC as cathode and Fe3O4@C/MWCNTs as anode shows stable performance with a high energy density of 29.8 Wh kg−1 at a power density of 299.0 W kg−1. Our strategy to prepare BC-based electrode materials may provide new opportunities for developing low-cost and efficient energy-storage devices.



中文翻译:

Ni Mn层状双氢氧化物和聚吡咯在细菌纤维素纳米纤维上的生长,可作为高效超级电容器

细菌纤维素(BC)是一种吸引人的生物质,可用于开发功能性电极,这些电极沿其交联的纳米纤维具有多种成分。在本文中,我们通过聚吡咯(PPy)和双金属氢氧化物(NiMn-LDH)的连续层组装展示了BC定向的三元复合材料。在我们的策略中,两种原位逐层沉积都是在温和条件下(≤25°C)实现的。通过调整在NiMn-LDH前体溶液中PPy / BC的进料重量,三元复合材料可在最高比表面积的情况下实现NiMn-LDH的最大负载量。优化的基于BC的电极材料在1.0 A g -1的电流密度下可提供653.1 C g -1的比容量。通过将NiMn-LDH / PPy / BC作为阴极和Fe 3组装而成的混合超级电容器O 4 @ C / MWCNTs作为阳极表现出稳定的性能,在299.0 W kg -1的功率密度下具有29.8 Wh kg -1的高能量密度。我们制备基于BC的电极材料的策略可能为开发低成本和高效的能量存储设备提供新的机会。

更新日期:2018-10-16
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