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首页> 外文期刊>RSC Advances >Catalyst-assisted electrochemical deposition of graphene decorated polypyrrole nanoparticles film for high-performance supercapacitor
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Catalyst-assisted electrochemical deposition of graphene decorated polypyrrole nanoparticles film for high-performance supercapacitor

机译：催化剂辅助电化学沉积石墨烯修饰的聚吡咯纳米颗粒用于高性能超级电容器

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A simple catalyst-assisted electrochemical deposition technique has been implemented to control the particle size of polypyrrole in the range of 5 to 10 nm embedded on graphene sheets, in which the nanocomposite will be used as a supercapacitor electrode material. The polypyrrole/graphene nanocomposite resulting from this approach maximizes the pseudocapacitive contribution of redox-active polypyrrole and electrical double layer capacitance (EDLC) contributed by individual graphene sheets. Specific capacitance, as high as 797.6 F g(-1) is obtained when 1.0 mM of FeCl3 catalyst is added to the deposition solution, which is approximately four times higher than that of polypyrrole film and 2.6 times higher than that of polypyrrole/graphene nanocomposite in the absence of catalyst. This increase is attributed to the controlled particle size of polypyrrole growth on individual graphene sheets, which prevents the overlapping of graphene sheets. This gives rise to a highly open structure, which provides an easier access of electrolyte within the matrix of the nanocomposite film. A fabricated symmetric supercapacitor device yields a specific capacitance of 463.15 F g(-1) and capacitance retention of 77.7% over 10 000 charge/discharge cycles at a current density of 1 A g(-1). The nanocomposite serves as a promising electrode material for supercapacitors.
机译：已经实施了一种简单的催化剂辅助电化学沉积技术，以控制埋在石墨烯片上的聚吡咯的粒径在5至10 nm的范围内，其中纳米复合材料将用作超级电容器电极材料。这种方法产生的聚吡咯/石墨烯纳米复合材料可最大化氧化还原活性聚吡咯的假电容贡献和单个石墨烯片所贡献的双电层电容（EDLC）。当将1.0 mM FeCl3催化剂添加到沉积溶液中时，可得到高达797.6 F g（-1）的比电容，这大约是聚吡咯膜的四倍，是聚吡咯/石墨烯纳米复合物的2.6倍在没有催化剂的情况下。该增加归因于在各个石墨烯片上的聚吡咯生长的受控粒径，这防止了石墨烯片的重叠。这产生了高度开放的结构，其提供了纳米复合膜的基质内的电解质的更容易进入。在1 A g（-1）的电流密度下，经过1万次充电/放电循环，制造的对称超级电容器器件可产生463.15 F g（-1）的比电容和77.7％的电容保持率。纳米复合材料用作超级电容器的有希望的电极材料。

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