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Kim, Cheolho,Kang, Da-Young,Moon, Jun Hyuk Elsevier 2018 Nano energy Vol.53 No.-
<P><B>Abstract</B></P> <P>Carbon electrodes that are thick and maintain a high volumetric energy density are essential for high energy storage microsupercapacitors (MSCs). Here, fabrication of an electrode based on a boron-doped 3D porous carbon pattern (B-3D-PCP) by lithographic processes is demonstrated. The B-3D-PCP is obtained by carbonization and doping of a polymer pattern fabricated by interference lithography. Then, plasma etching is performed on the B-3D-PCP to obtain an interdigitated electrode, and a polymer electrolyte is applied to complete the MSC. The B-3D-PCP shows remarkably high pseudocapacitance after B-doping. This electrode also exhibits no capacitance loss when the electrode width increases, even at very high scan rates, owing to the uniform pores of the 3D-PCP. The solid-state B-3D-PCP MSC with a polymer gel electrolyte shows a capacitance of 7.1 mF/cm<SUP>2</SUP>, with a remarkable capacitance retention of 81%, especially upon a scan rate increase of 10 times at 100 mV. With B-3D-PCP MSCs, a volumetric energy density of 7.1 mWh/cm<SUP>3</SUP> and a volumetric power density of 66 W/cm<SUP>3</SUP> could be achieved. Finally, the performance of the MSC is demonstrated by using it to power various electronic devices. The results suggest a new electrode for the MSC that overcomes the performance limitations of conventional electrodes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We demonstrate a boron-doped 3D porous carbon pattern (B-3D-PCP) electrode fabricated by a full lithographic process. </LI> <LI> The B-3D-PCP microsupercapacitor shows a capacitance of 7.15mF/cm<SUP>2</SUP>, with a remarkable capacitance retention of 81%. </LI> <LI> The B-3D-PCP MSCs had a volumetric energy density of 7.1 mWh/cm<SUP>3</SUP> and volumetric power density of 66 W/cm<SUP>3</SUP>. </LI> <LI> We successfully demonstrate the performance of our MSC by powering various electronic devices. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Summary of the research: We fabricated a boron-doped 3D porous carbon pattern electrode using 3D interference lithography and applied it to a microsupercapacitor to obtain an excellent volumetric energy density of 7.1 mWh/cm<SUP>3</SUP>.</P> <P>[DISPLAY OMISSION]</P>
Ultrahigh Areal-Number-Density Printable Solid-State On-Chip Microsupercapacitors
이권형,이주원,이상영 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The forthcoming smart ubiquitous era, which will find the widespread popularity of advanced microelectronics, miniaturized portable/wearable devices, and the Internet of Things (IoT), has spurred us to relentlessly search for micro-scale monolithic power sources. Microsupercapacitors (MSCs) have received much attention as a promising candidate to address the aforementioned issue. However, their practical application has been hindered by the manufacturing complexity and dimensional limits. Here, we for the first time develop a new class of ultrahigh areal-number-density solid-state MSCs (UHD SS-MSCs) on a chip via electrohydrodynamic (EHD) jet-printing. Driven by the process superiority and rational design of their components, the on-chip UHD SS-MSCs exhibit exceptionally high areal-number-density (36 unit cells integrated on a chip (area = 8.0 × 8.2 ㎟), 55.3 cells cm<sup>-2</sup>) and areal-operating-voltage (65.9 V cm<sup>-2</sup>) that lie far beyond those of previously reported MSCs.
Modified Biochar-based Flexible All-solid-state Microsupercapacitor Fabricated by Ink-jet Method
Hyeong Ryeol KIM,Eun Jeong KIM,Kyung Rae KIM,Ja Hyun LEE,Hah Young YOO,Chulhwan PARK,Seung Wook KIM 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
With increasing interest in environmental and energy issues, biochar-based supercapacitors had attracted much attention as eco-friendly energy storage modules. However, most of the biochar-based supercapacitor was not flexible for application as a flexible device. In this study, we developed the biochar-based flexible all-solid-state microsupercapacitor using pen lithography which was one of the ink-jet methods. The biochar was produced using nitric acid pretreated waste rice straw. The modified biochar by nitric acid was favorable to applicate as ink due to its excellent dispersion by an increased hydroxyl group. Moreover, it had increased specific surface area and graphitic carbon structure, resulting in increased electrochemical double-layer capacitance. Poly(3,4-ethylene dioxythiophene) (PEDOT) was added for increasing mechanical stability with flexibility and an optimized concentration of manganese(IV) oxide was added for increasing pseudocapacitance. The energy density of the fabricated microsupercapacitor was 14.0 Wh kg<SUP>-1</SUP> at a power density of 53.1 W kg<SUP>-1</SUP>. The proposed micro-supercapacitor suggested a cost-effective and eco-friendly platform for fabricating energy storage modules using waste rice straw.
Air-Stable, High-Performance, Flexible Microsupercapacitor with Patterned Ionogel Electrolyte
Kim, Daeil,Lee, Geumbee,Kim, Doyeon,Ha, Jeong Sook American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.8
<P>We describe the fabrication of air-stable, high-performance, planar microsupercapacitors (MSCs) on a flexible poly(ethylene terephthalate) substrate with patterned ionogel electrolyte, i.e., poly(ethylene glycol) diacrylate/1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, and electrodes of spray-coated multiwalled carbon nanotubes. The flexible MSC showed good cyclability, retaining similar to 80% of initial capacitance after 30 000 cycles, and good mechanical stability down to a bending diameter of 3 mm under compressive stress; 95% of the initial capacitance was retained after 1000 bending cycles. The MSC had high electrochemical stability with retaining 90% of its initial capacitance for 8 weeks in air. Furthermore, vertical stacking of MSCs with patterned solid film of ionogel electrolyte could increase the areal capacitance dramatically. This flexible MSC has potential applications as an energy-storage device in micro/nanoelectronics, without encapsulation for air stability.</P>
High-Density, Stretchable, All-Solid-State Microsupercapacitor Arrays
Hong, Soo Yeong,Yoon, Jangyeol,Jin, Sang Woo,Lim, Yein,Lee, Seung-Jung,Zi, Goangseup,Ha, Jeong Sook American Chemical Society 2014 ACS NANO Vol.8 No.9
<P>We report on the successful fabrication of stretchable microsupercapacitor (MSC) arrays on a deformable polymer substrate that exhibits high electrochemical performance even under mechanical deformation such as bending, twisting, and uniaxial strain of up to 40%. We designed the deformable substrate to minimize the strain on MSCs by adopting a heterogeneous structure consisting of stiff PDMS islands (on which MSCs are attached) and a soft thin film (mixture of Ecoflex and PDMS) between neighboring PDMS islands. Finite element method analysis of strain distribution showed that an almost negligible strain of 0.47% existed on the PDMS islands but a concentrated strain of 107% was present on the soft thin film area under a uniaxial strain of 40%. The use of an embedded interconnection of the liquid metal Galinstan helped simplify the fabrication and provided mechanical stability under deformation. Furthermore, double-sided integration of MSCs increased the capacitance to twice that of MSCs on a conventional planar deformable substrate. In this study, planar-type MSCs with layer-by-layer assembled hybrid thin film electrodes of MWNT/Mn<SUB>3</SUB>O<SUB>4</SUB> and PVA-H<SUB>3</SUB>PO<SUB>4</SUB> electrolyte were fabricated; when they are integrated into a circuit, these MSCs increase the output voltage beyond the potential of the electrolyte used. Therefore, various LEDs that require high voltages can be operated under a high uniaxial strain of 40% without any decrease in their brightness. The results obtained in this study demonstrate the high potential of our stretchable MSC arrays for their application as embedded stretchable energy storage devices in bioimplantable and future wearable nanoelectronics.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-9/nn503799j/production/images/medium/nn-2014-03799j_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn503799j'>ACS Electronic Supporting Info</A></P>
Biaxially Stretchable, Integrated Array of High Performance Microsupercapacitors
Lim, Yein,Yoon, Jangyeol,Yun, Junyeong,Kim, Daeil,Hong, Soo Yeong,Lee, Seung-Jung,Zi, Goangseup,Ha, Jeong Sook American Chemical Society 2014 ACS NANO Vol.8 No.11
<P>We report on the fabrication of a biaxially stretchable array of high performance microsupercapacitors (MSCs) on a deformable substrate. The deformable substrate is designed to suppress local strain applied to active devices by locally implanting pieces of stiff polyethylene terephthalate (PET) films within the soft elastomer of Ecoflex. A strain suppressed region is formed on the top surface of the deformable substrate, below which PET films are implanted. Active devices placed within this region can be isolated from the strain. Analysis of strain distribution by finite element method confirms that the maximum strain applied to MSC in the strain suppressed region is smaller than 0.02%, while that on the Ecoflex film is larger than 250% under both uniaxial strain of 70% and biaxial strain of 50%. The all-solid-state planar MSCs, fabricated with layer-by-layer deposited multiwalled carbon nanotube electrodes and patterned ionogel electrolyte of poly(ethylene glycol) diacrylate and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide having high-potential windows, are dry-transferred onto the deformable substrate and electrically connected in series and parallel <I>via</I> embedded liquid metal interconnection and Ag nanowire contacts. Liquid metal interconnection, formed by injecting liquid metal into the microchannel embedded within the substrate, can endure severe strains and requires no additional encapsulation process. This formed MSC array exhibits high energy and power density of 25 mWh/cm<SUP>3</SUP> and 32 W/cm<SUP>3</SUP>, and stable electrochemical performance up to 100% uniaxial and 50% biaxial stretching. The high output voltage of the MSC array is used to light micro-light-emitting diode (μ-LED) arrays, even under strain conditions. This work demonstrates the potential application of our stretchable MSC arrays to wearable and bioimplantable electronics with a self-powered system.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-11/nn504925s/production/images/medium/nn-2014-04925s_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn504925s'>ACS Electronic Supporting Info</A></P>