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Kotal, Moumita,Kim, Hyunjun,Roy, Sandipan,Oh, Il-Kwon The Royal Society of Chemistry 2017 Journal of Materials Chemistry A Vol.5 No.33
<P>Structural energy storage devices having load-bearing or stress-tolerant functionalities are crucial for designing wearable and soft electronics. In order to supply power to next-generation electronic systems, structurally resilient solid-state supercapacitors (SRSSs) with sustainable conductivities and electrochemical performances under large compressions are a promising candidate. Here, we report a synthetic porous framework of a nitrogen and sulfur co-doped holey graphene aerogel (NS-HGA) for SRSSs under high compression loadings. Such a covalently interconnected holey graphene nano-architecture co-doped with nitrogen (3.11%) and sulfur (1.87%) has a greatly improved resilient structural integrity, with repeatable elasticity along with high compressive strength. Therefore, the NS-HGA featuring high electrolyte ion storage, unhindered ion channels, excellent conductivity (21.66 S m<SUP>−1</SUP>), and promising electrochemical performances exhibits significantly high volumetric capacitance (203 mF cm<SUP>−3</SUP>) in a SRSS with good rate capability and almost unaltered capacitance even at 50% compression, with good durability for 200 cycles. Interestingly, when four NS-HGA:SRSSs were integrated into series, a bright green LED was illuminated even after charging for very few seconds. The proposed dual heteroatom-doped holey graphene aerogel, devoid of any pseudocapacitive materials, can be successfully used for high compression-permissive SRSSs in the modern era of wearable and soft elastic electronics.</P>
Lee, Si-Hwa,Kotal, Moumita,Oh, Jung-Hwan,Sennu, Palanichamy,Park, Sung-Ho,Lee, Yun-Sung,Oh, Il-Kwon Elsevier 2017 Carbon Vol.119 No.-
<P>Graphene hybrid nanostructures have emerged as potential candidates as efficient anode materials for lithium-ion batteries. However, two-dimensional plate-like structures protect rapid transport of lithium ions through the thickness direction, resulting in a long pathway of lithium ions and low rate performances. Here, we report a nanohole-structured, iron oxide-decorated and gelatin-functionalized graphene (D-N-GG) for high rate and high capacity lithium-ion anode. Initially, to produce effective path way of lithium ions, physical nanoholes on the graphene layers were generated by microwave-irradiated iron nanoparticles. And then, the gelatin was used to form nitrogen-doped graphene having more active sites for lithium ion storage. Finally, D-N-GG was synthesized by two-step microwave irradiations shows a three-dimensional interconnected mesoporous structure with a uniform decoration of iron oxide nanoparticles on the nanohole-structured graphene, resulting in highly conductive networks and short diffusion lengths for effective lithium ion transport. As a result, the obtained D-N-GG nanostructure delivered a reversible capacity of 924 mAh g(-1) even over 40 cycles along with a coulombic efficiency in excess of 99%. Especially, even after 65 cycles with variable current density of 100-800 mA g(-1), the discharge capacity returned to 1096 mAh g(-1), which indicated a very stable and high-rate cyclic performance. (C) 2017 Elsevier Ltd. All rights reserved.</P>