Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Korea.
Department of Forest Products, Korea Forest Research Institute, Seoul 02455, Korea.
Sci Rep. 2017 Jan 31;7:41708. doi: 10.1038/srep41708.
Supercapacitors (SCs) have garnered considerable attention as an appealing power source for forthcoming smart energy era. An ultimate challenge facing the SCs is the acquisition of higher energy density without impairing their other electrochemical properties. Herein, we demonstrate a new class of polyacrylonitrile (PAN)/multi-walled carbon tube (MWNT) heteromat-mediated ultrahigh capacitance electrode sheets as an unusual electrode architecture strategy to address the aforementioned issue. Vanadium pentoxide (VO) is chosen as a model electrode material to explore the feasibility of the suggested concept. The heteromat VO electrode sheets are produced through one-pot fabrication based on concurrent electrospraying (for VO precursor/MWNT) and electrospinning (for PAN nanofiber) followed by calcination, leading to compact packing of VO materials in intimate contact with MWNTs and PAN nanofibers. As a consequence, the heteromat VO electrode sheets offer three-dimensionally bicontinuous electron (arising from MWNT networks)/ion (from spatially reticulated interstitial voids to be filled with liquid electrolytes) conduction pathways, thereby facilitating redox reaction kinetics of VO materials. In addition, elimination of heavy metallic foil current collectors, in combination with the dense packing of VO materials, significantly increases (electrode sheet-based) specific capacitances far beyond those accessible with conventional slurry-cast electrodes.
超级电容器 (SCs) 作为未来智能能源时代极具吸引力的电源而备受关注。SCs 面临的一个终极挑战是在不损害其其他电化学性能的情况下获得更高的能量密度。在此，我们展示了一类新型的聚丙烯腈 (PAN)/多壁碳管 (MWNT) 杂化体介导的超高电容电极片，作为一种不寻常的电极结构策略来解决上述问题。五氧化二钒 (VO) 被选为模型电极材料来探索所提出概念的可行性。杂化体 VO 电极片是通过一锅法制备的，该方法基于同时进行的静电喷雾 (用于 VO 前体/MWNT) 和静电纺丝 (用于 PAN 纳米纤维)，然后进行煅烧，导致 VO 材料与 MWNTs 和 PAN 纳米纤维紧密接触的紧密堆积。因此，杂化体 VO 电极片提供了三维连续的电子 (来自 MWNT 网络) /离子 (来自空间交联的间隙空隙，用于填充液体电解质) 传导途径，从而促进了 VO 材料的氧化还原反应动力学。此外，消除了重金属箔集流器，并结合 VO 材料的紧密堆积，显著提高了（基于电极片的）比传统浆料涂覆电极更高的比电容。
