Dubal Deepak P, Aradilla David, Bidan Gérard, Gentile Pascal, Schubert Thomas J S, Wimberg Jan, Sadki Saïd, Gomez-Romero Pedro
Catalan Institute of Nanoscience and Nanotechnology, CIN2, ICN2 (CSIC-ICN), Campus UAB E-08193, Bellaterra, Barcelona.
1] Univ. Grenoble Alpes, INAC-SPRAM, F-38000 Grenoble, France [2] CNRS, SPRAM, F-38000 Grenoble, France [3] CEA, INAC-SPRAM, F-38000 Grenoble, France.
Sci Rep. 2015 May 18;5:9771. doi: 10.1038/srep09771.
Building of hierarchical core-shell hetero-structures is currently the subject of intensive research in the electrochemical field owing to its potential for making improved electrodes for high-performance micro-supercapacitors. Here we report a novel architecture design of hierarchical MnO2@silicon nanowires (MnO2@SiNWs) hetero-structures directly supported onto silicon wafer coupled with Li-ion doped 1-Methyl-1-propylpyrrolidinium bis(trifluromethylsulfonyl)imide (PMPyrrBTA) ionic liquids as electrolyte for micro-supercapacitors. A unique 3D mesoporous MnO2@SiNWs in Li-ion doped IL electrolyte can be cycled reversibly across a voltage of 2.2 V and exhibits a high areal capacitance of 13 mFcm(-2). The high conductivity of the SiNWs arrays combined with the large surface area of ultrathin MnO2 nanoflakes are responsible for the remarkable performance of these MnO2@SiNWs hetero-structures which exhibit high energy density and excellent cycling stability. This combination of hybrid electrode and hybrid electrolyte opens up a novel avenue to design electrode materials for high-performance micro-supercapacitors.
由于构建分级核壳异质结构在制造用于高性能微型超级电容器的改进电极方面具有潜力，因此目前它是电化学领域深入研究的主题。在此，我们报告了一种新颖的分级MnO₂@硅纳米线（MnO₂@SiNWs）异质结构的架构设计，该结构直接支撑在硅片上，并结合锂离子掺杂的1-甲基-1-丙基吡咯烷鎓双（三氟甲基磺酰）亚胺（PMPyrrBTA）离子液体作为微型超级电容器的电解质。在锂离子掺杂的离子液体电解质中，独特的三维介孔MnO₂@SiNWs可以在2.2 V的电压下可逆循环，并表现出13 mFcm⁻²的高面积电容。SiNWs阵列的高导电性与超薄MnO₂纳米片的大表面积相结合，是这些MnO₂@SiNWs异质结构具有卓越性能的原因，这些异质结构表现出高能量密度和出色的循环稳定性。这种混合电极和混合电解质的组合为设计用于高性能微型超级电容器的电极材料开辟了一条新途径。
