Opening MXene Ion Transport Channels by Intercalating PANI Nanoparticles from the Self-Assembly Approach for High Volumetric and Areal Energy Density Supercapacitors

• DOI: 10.1021/acsami.1c06934
• Publication Date: 2021-06-22T13:42:10Z
• Authors: Xue Wang; Yuanming Wang; Dongdong Liu; Xiaolong Li; Huanhao Xiao; Yu Ma; Ming Xu; Guohui Yuan; Gairong Chen
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Two-dimensional (2D) MXene materials have attracted great attention as advanced energy storage devices. A Ti3C2 film can be used a high-performance electrode material for flexible supercapacitors owing to its high specific capacitance, excellent conductivity, and remarkable flexibility. Unfortunately, self-stacking of nanosheets makes them hard balance the volumetric areal capacitance performance. Herein, conductive polyaniline nanoparticles (PANI NPs, ∼10 nm) are proposed intercalators regulate nanosheet interlayer by self-assembly method. Interlayered PANI NPs not only restrain but also enable more ion transport routes, filled in form that build interconnected channels. Meanwhile, slightly changes thickness MX/PANI hybrid film, thus bringing capacitance. As result, freestanding NPs-10% displays an 1885 mF cm–2 (377 F g–1), meanwhile maintains 873 cm–3 even when load reaches 5 mg cm–2. Moreover, symmetric supercapacitor assembled demonstrates density (90.3 μWh cm–2) (20.9 Wh L–1) compared MXene-based reported literature. This rational design balancing densities provides another approach solving inherent problems further exploiting toward application