دانلود رایگان مقاله لاتین رشد پلی آنیلین نانوسیم در فوم گرافن ماکرو از سایت الزویر
عنوان فارسی مقاله:
رشد قابل کنترل آرایه های پلی آنیلین نانوسیم در فوم گرافن ماکرو/ مزوپور سلسله مراتبی برای ابرخازنهای انعطاف پذیر با عملکرد بالا
عنوان انگلیسی مقاله:
Controllable growth of polyaniline nanowire arrays on hierarchical macro/mesoporous graphene foams for high-performance flexible supercapacitors
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مقدمه انگلیسی مقاله:
1. Introduction
Supercapacitors (SC) with a high power capability and relatively large energy density compared to conventional capacitors have attracted considerable attention and will be a promising candidate for energy storages [1]. Recently, great efforts have been dedicated to develop porous graphene materials, including crumpled graphene [2,3], holey graphene sheets and graphene foam [4,5], as free-standing electrodes for high-performance flexible supercapacitors. Compared to original graphene sheets, porous graphene structure has a larger surface area which can increase the contact interfaces of electrode/electrolyte and also facilitate the ion diffusions [6]. Moreover, three-dimensional (3D) porous frameworks could provide multi-dimensional pathways for efficient ionic and electronic transport, resulting in a good electrochemical performance. Among the porous graphene materials, graphene foam (GF) has attracted lots of attentions due to its partly inheriting theproperties of two dimensional graphene into 3D macroporous structure and the freestanding and flexible features. Its macroporous structure brings about light-weight, excellent conductivity and adsorption characteristics [7–9]. However, the free-standing GF suffers from lacking of well-defined interconnected hierarchical mesopores or micropores, which exhibits relatively low energy density because of the less efficiency of mass transport and charge storage for supercapacitor. To address the inferior energy densities of GF, the hierarchical structure combined materials with different functions would be a promising approach to provide on both power and energy densities. Wu et al. integrated mesoporous silica walls within 3D interconnected macroporous graphene-based frameworks, showing high specific capacitance and good rate capability [10]. Choi et al. demonstrated a 3D macroporous graphene film (e-CMG) prepared using polystyrene (PS) colloidal particles as sacrificial template, and then a thin layer of MnO2 was additionally deposited onto e-CMG, which delivered a 2-fold higher specific capacitance than that of e-CMG [11]. Liu et al. also synthesized the nitrogen-doped 3D graphene frameworks by the similar method as anode for lithium-ion batteries [12]. Wang et al. fabricated a N and S doped hierarchically porous graphene (DHPG) electrode through a facile in situ constructing strategy in nickel foam usinggraphene oxide (GO), sulfonated polystyrene (S-PS) spheres, and poly(vinyl pyrrolidone) (PVP) as precursors. The novel electrodes exhibit ultrafast charge/discharge rate capabilities due to the synergistic effects of the well-defined structure and heteroatom doping [13]. Therefore, itis highly attractive to build up hierarchical porous architectures of 3D graphene network by integrating small channels within interconnected macroporous frameworks. Polyaniline (PANI) has become a good candidate for supercapacitor electrodes due to its low cost, easy synthesis and high pseudocapacitance [14–16]. PANI nanowires with highly-ordered are beneficial to facilitate ion transport by shorten diffusion pathways [17–19]. While the considerable volume changes and mechanical degradation during the repeated intercalation and depletion of ions in the charge/discharge process are the bottleneck for its practical application [20]. Wang et al. synthesized PANI nanowire arrays on flexible PS macrosphere/reduced graphene film with 3D hierarchical structure by the following removal of PS templates, which exhibited high specific capacitance of 740 F g−1 [21]. Chen et al. reported that nanostructured PS-PANI/reduced graphene oxide hybrid composites as supercapacitor electrodes showed a specific capacitance of 180 F g−1 at a current density of 0.5Ag−1 [22,23]. Therefore, 3D free-standing hierarchical porous structure graphene foam can act as robust supporting materials to improve the cycle stability and specific capacitance of PANI. In our previous work, a novel porous reduced graphene oxide foam (RGO-F)/PANI nanowires composite was fabricated by in situ polymerization, showing a high specific capacitance (790 F g−1 at a current density of 1Ag−1) as flexible supercapacitor [24]. However, the free-standing RGO-F exhibits low specific surface area and lacks of well-defined interconnected mesopores/micropores, leading to relatively low energy density. Therefore, the incorporation of meso-/micropores into the RGO-F/PANI composites can enhance the specific capacitance and energy density. Herein, we employed a “templating and embossing” technique to fabricate a free-standing, light-weight and hierarchical macro/mesoporous flexible foam (fRGO-F) by using PS colloidal particles as sacrifi- cial templates accompanying with the activation of KOH. Nickel foams (NF) were immersed in the GO and amino-modified PS mixed suspension, and fRGO-F was obtained by the removal of NF and following calcination in N2 atmosphere, as shown in Fig. 1. The PS particles could be served as effective “spacers” to effectively avoid the aggregation of reduced GO sheets. The unique hierarchical structures could not only boost ion and electron movements in electrochemical processes but also enabled the porous fRGO-F to serve as a 3D skeleton to combine with pseudoactive materials such as vertically aligned polyaniline (PANI) nanowires with a high mass loading. Controllable growth of PANI nanowire arrays on the fRGO-F networks can enhance the specific capacitance and ensure the utilization of the porous frameworks of the flexible substrate. The fRGO-F/PANI flexible composite could well retain the interconnected framework of fRGO-F, which facilitates easy access of the electrolyte ions to the electrodes. The symmetric SC device based on fRGO-F/PANI electrodes in the 1 M H2SO4 electrolyte exhibits a specific capacitance of 939 F g−1, a maximum power density and energy density of 20.9Wh kg−1 and 103.2 kWkg−1, respectively. Besides, it also displays a good cycling performance of 88.7% of the initial capacitance over 5000 cycles.
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کلمات کلیدی:
Graphene-Wrapped Polyaniline Nanowire Arrays on Nitrogen-Doped ... pubs.acs.org/doi/abs/10.1021/la404765z by P Yu - 2014 - Cited by 70 - Related articles Apr 24, 2014 - The resulting hierarchical symmetric supercapacitor based on .... at the growth of conducting zone in polyaniline-graphene composite films. Graphene Science Handbook: Nanostructure and Atomic Arrangement https://books.google.com/books?isbn=1466591382 Mahmood Aliofkhazraei, Nasar Ali, William I. Milne - 2016 - Science Dumee, L. et al., A preliminary study on the effect of macro cavities formation on .... Nguyen, D.D. et al., Controlled growth of carbon nanotubegraphene hybrid ... Xu, J. et al., Hierarchical nanocomposites of polyaniline nanowire arrays on ... Fabrication of graphene foam supported carbon nanotube/polyaniline ... iopscience.iop.org/article/10.1088/2053-1583/1/3/034002/meta by H Yang - 2014 - Cited by 4 - Related articles Nov 13, 2014 - ... Wei Z X 2010 Hierarchical nanocomposites of polyaniline nanowire arrays .... K 2012 Three-dimensional graphene-based macro- and mesoporous ... and Xu Q 2013 Controlled growth of whisker-like polyaniline on carbon ... Hybrid and Hierarchical Composite Materials https://books.google.com/books?isbn=331912868X Chang-Soo Kim, Charles Randow, Tomoko Sano - 2015 - Technology & Engineering ... Glucose biosensor based on Au nanoparticlesconductive polyaniline nanocomposite. ... Jiang SP (2007) Highly ordered Pd nanowire arrays as effective electrocatalysts for ... of size-controlled nanoparticles within a hierarchically macroporous ... Cao G, Wang ZL, Yang Y, Shi Z, Gu Z (2008) Growth of manganese oxide ... Qinghua Zhang-Donghua University| ScholarMate www.scholarmate.com/scmwebsns/resume/view?des3PsnId... Translate this page Yu, Pingping; *Zhao, Xin; Li, Yingzhi; *Zhang, Qinghua, Controllable growth of polyaniline nanowire arrays on hierarchical macro/mesoporous graphene foams ... Synergistic Effect between Ultra-Small Nickel Hydroxide Nanoparticles ... https://www.ncbi.nlm.nih.gov › NCBI › Literature › PubMed Central (PMC) by Y Liu - 2015 - Cited by 39 - Related articles Jun 8, 2015 - These considerable mesopores and macropores can facilitate the rapid ..... Controllable growth of CNTs on graphene as high-performance electrode material ... Hierarchical nanocomposites of polyaniline nanowire arrays on ...
