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Lee, Jaehak,Seok, Jae Young,Son, Seokwoo,Yang, Minyang,Kang, Bongchul Royal Society of Chemistry 2017 Journal of Materials Chemistry A Vol.5 No.47
<P>A high-performance and flexible micro-supercapacitor based on a self-generated nanoporous silver layer was fabricated by a one-step laser-induced growth-sintering process of a particle-free organometallic solution. The porous structures self-generated on a polymer film and were freely adjustable by controlling the rate of laser input dose. By changing the patterning mode, the nanoporous electrodes with extremely high surface area and highly conductive current collectors were formed in a single processing domain. Electrodeposition of hetero metal oxides (manganese and iron oxides) as the active materials followed, and a flexible micro-supercapacitor with high volumetric energy density of 16.3 mW h cm<SUP>−3</SUP>and power density of 3.54 W cm<SUP>−3</SUP>was formed. This was achieved through the large surface area and high electrical conductivity of the nanoporous silver layer, and high operating voltage due to the asymmetrical electrode configuration. This method resulted in a faster and more cost-effective manufacturing process than conventional MSCs fabrication. It also achieved the highest volumetric energy density in metal/oxide-based MSCs as a state-of-the-art performance.</P>
Jaehak Lee,Jae Young Seok,Minyang Yang,Bongchul Kang 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.1
Hybrid supercapacitors are considered as one of the most promising next-generation energy storage devices, owing to highenergy, high-power density, and long-cycle life. In this work, a simple and low-cost fabrication method of the nanostructured anode with a high capacity and power is proposed for fabrication of high-performance hybrid supercapacitors. This is achieved by a one-step in-situ growth of numerous copper nanopillars on a commercially available copper foil though the galvanic displacement reaction in an aqueous ionic solution. The copper nanopillar forest-based structure with a high surface area, ion accessibility, and electron transportability provides excellent current collecting characteristics for the anode of a lithium-ion battery. The electrochemical performance of a Li half-cell incorporating the copper nanopillar-based current collector exhibits a high capacity (880 mAh g − 1 at 0.2 °C), excellent rate capability, and extremely high durability (97% after 1000 cycles). These results show that the fabricated anode structure can improve the electrochemical performance of the hybrid supercapacitors. To demonstrate the feasibility of an alternative power source, the full cell was fabricated by combining the copper nanopillar anode and an activated carbon cathode. This device provided a high energy density (98.9 Wh kg − 1 at 248 W kg − 1 ), high power density (7018 W kg − 1 ), and long-cycle life (> 1000 cycles).
Lee, Jinwoo,Lee, Jaehak,Kwon, Jinhyeong,Lee, Habeom,Eom, Hyeonjin,Yoon, Yeosang,Ha, Inho,Yang, Minyang,Ko, Seung Hwan American Chemical Society 2017 Langmuir Vol.33 No.8
<P>Controlling the surface morphology of the electrode on the nanoscale has been studied extensively because the surface morphology of a material directly leads to the functionalization in various fields of studies. In this study, we designed a simple and cost-effective method to fine-tune the surface morphology and create controlled nanopores on the silver electrode by utilizing 2-ethoxyethanol and two successive heat treatments. High electrical conductivity and mechanical robustness of nanoporous silver corroborate its prospect to be employed in various applications requiring a certain degree of flexibility. As a proof-of-concept, a high-performance supercapacitor was fabricated by electrodepositing MnO2. This method is expected to be useful in various electronic applications as well as energy storage devices.</P>
Lee, Jaehak,Song, Juhee,Sung, Gun Yong,Shin, Jung H. American Chemical Society 2014 NANO LETTERS Vol.14 No.10
<P>Plasmonic air-gap disk resonators with 3.5 μm diameter and a 4 nm thick, 40 nm wide air gap for a mode area of only λ<SUB>0</SUB><SUP>2</SUP>/15 000 were fabricated using photolithography only. The resonant modes were clearly identified using tapered fiber coupling method at the resonant wavelengths of 1280–1620 nm. We also demonstrate the advantage of the air-gap structure by using the resonators as label-free biosensors with a sensitivity of 1.6 THz/nm.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-10/nl5018892/production/images/medium/nl-2014-018892_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl5018892'>ACS Electronic Supporting Info</A></P>