A Novel Polyaniline Nanowire Arrays/Three‐Dimensional Graphene Composite for Supercapacitor

Abstract

It is an effective way to obtain high performance supercapacitors by increasing the surface area and conductivity of electrode materials. In this paper, three‐dimensional (3D) graphene with a small pore size, good electrical conductivity and high mechanical strength is fabricated by chemical vapor deposition using nickel nanoparticles as the template. Then, a polyaniline nanowire arrays (PANI NWAs)/3D graphene composite is fabricated by in‐situ polymerization. Due to the high conductivity and unique nano‐structure, the as‐prepared PANI NWAs/3D graphene composite exhibits an excellent capacitance of 680 F g−1 at current density of 1 A g−1. Moreover, a symmetric supercapacitor based on the PANI NWAs/3D graphene composite is assembled, and it shows an energy density of 6.43 Wh kg−1 at a power density of 0.4 kW kg−1. The assembled supercapacitor also exhibits a good cycling stability, which retains 78 % of its initial specific capacitance after 1000 cycles.

Polyaniline nanowire arrays generated through oriented mesoporous silica films: effect of pore size and spectroelectrochemical response

“…, for sensors 86–89 ) or energy storage ( e.g. , as supercapacitors 88–91 ), we provide hereafter some preliminary results in support of these possible applications.…”

“…For template-free PANI nanolaments, the electrode surface is covered only with a small amount of the polymer (i.e., 0.55 mg) and, if expressing the specic capacitance per mass of the material, one reached 427 F g À1 (at 9 A g À1 ), which is comparable to PANI-graphene composites. 91 This material retained 64% of its initial specic capacitance aer 500 cycles and 47% aer 1000 cycles (Fig. 9C), whereas PANI nanowires in the mesoporous lm before silica etching (Fig.…”

“…Just to give an idea on what could be achieved next with such a selection of PANI nanolaments, and considering the interest of PANI nanowire arrays for applications in the elds of electrocatalysis (i.e., for sensors [86][87][88][89] ) or energy storage (e.g., as supercapacitors [88][89][90][91] ), we provide hereaer some preliminary results in support of these possible applications. Fig.…”

A flexible, lightweight and stretchable all-solid-state supercapacitor based on warp-knitted stainless-steel mesh for wearable electronics

“…The stretchable SC achieved mass and areal capacitance of 18.55 F g À1 and 53 mF cm À2 at a current of 0.07 mA and presented rate performance with 68% retention of its original capacitance when the current was enhanced to 3.5 mA (Figure 6(f)). Due to the electrode substrate having diamond-shaped loops, the areal capacitance of the assembled device is lower than some in the literature, including polyaniline (PANI)/graphene composite (72.3 F g À1 at 1 A g À1 ) 42 and PEDOT:polystyrene sulfonate (PSS)/ multi-walled carbon nanotube (MWCNT) film (20.3 F g À1 at 1 mA), 43 but still higher than some SCs, such as graphene hydrogel/Zn foils (33.8 mF cm À2 at 1 mA cm À2 ), 44 ZnO-MnO 2 -carbon cloths (26 mF cm À2 at 0.5 mA cm À2 ), 45 activated carbon cloths (31 mF cm À2 at 10 mV s À1 ), 46 metal organic framework (MOF)/PANI/carbon cloth (35 mF cm À2 at 0.05 mA cm À2 ) 47 and RGO-PANI (39.08 mF cm À2 at 1 mA), 48 which is summarized in Table 1. Moreover, the as-prepared device retained %73% of its original capacitance after 5000 cycles (Figure 6(g)).…”

Synthesis and Electrochemical Properties of One‐Dimensional γ‐MnOOH Nanorods

“…[4][5][6][7][8][9][10][11][12][13][14][15][16] In recent years, manganese oxides have attracted much attention in the field of supercapacitors due to their advantages such as abundant resources, environmental friendliness, and high theoretical specific capacity. [17][18][19][20][21][22][23][24][25][26][27] MnOOH, as a trivalent hydroxide polycrystalline material stable at room temperature with easy preparation and flexible structure, as well as higher conductivity (10 À 4 -10 À 5 S/cm) compared to MnO 2 , is considered a promising candidate for supercapacitor electrode materials. [28][29][30][31] MnOOH has a structural unit based on [MnO 6 ] octahedra, which form tunneled or layered alkaline manganese oxide crystalline compounds by means of co-prisms or co-angles between these [MnO 6 ] octahedra.…”