Multifunctional Tactile Sensors: A Highly Sensitive Tactile Sensor Using a Pyramid‐Plug Structure for Detecting Pressure, Shear Force, and Torsion (Adv. Mater. Technol. 3/2019)

Choi, Daehwan; Jang, Sukjin; Kim, Sang Woo; Kim, Do Hwan; Kwon, Jang Yeon

doi:10.1002/admt.201970019

Cited by 3 publications

(3 citation statements)

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“…Under the conditions of an OCV holding test with a relatively high‐temperature of 90 °C and low RH of 30 %, the chemical degradation of the membrane and ionomer induced by radicals was accelerated. [ 34,64,76 ] Therefore, we conducted an OCV holding test to evaluate the molecular sieve effect of the MCL on the chemical stability of the prepared MEAs. Figure 4B depicts the decay curves of OCV for the MEAs with Pt/C and Pt@MCL over 120 h during the accelerated OCV holding test, where O 2 gas was directly supplied to the cathode instead of air.…”

Section: Resultsmentioning

confidence: 99%

“…An accelerated OCV holding test was conducted for 120 h by supplying partially humidified H 2 and O 2 with the same flow rate of 300 sccm at 90 °C under RH 30 % condition. [ 34,64,76 ] After the OCV holding test, the drain water from the anode and cathode was collected to analyze the concentration of the total eluted fluorine ions. The I–V polarization curves, EIS, and linear sweep voltammetry (LSV) were measured before and after the protocol.…”

Section: Methodsmentioning

confidence: 99%

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Redesign of Anode Catalyst for Sustainable Survival of Fuel Cells

Ko,

Kim,

Min

et al. 2024

Advanced Science

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Polymer electrolyte membrane fuel cells (PEMFCs) suffer from severe performance degradation when operating under harsh conditions such as fuel starvation, shut‐down/start‐up, and open circuit voltage. A fundamental solution to these technical issues requires an integrated approach rather than condition‐specific solutions. In this study, an anode catalyst based on Pt nanoparticles encapsulated in a multifunctional carbon layer (MCL), acting as a molecular sieve layer and protective layer is designed. The MCL enabled selective hydrogen oxidation reaction on the surface of the Pt nanoparticles while preventing their dissolution and agglomeration. Thus, the structural deterioration of a membrane electrode assembly can be effectively suppressed under various harsh operating conditions. The results demonstrated that redesigning the anode catalyst structure can serve as a promising strategy to maximize the service life of the current PEMFC system.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Redesign of Anode Catalyst for Sustainable Survival of Fuel Cells

Ko,

Kim,

Min

et al. 2024

Advanced Science

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“…In recent years, wearable electronic device technology has been used in a wide range of applications in motion detection [1][2][3][4][5] , medical monitoring [6][7][8][9] and virtual reality (VR) [10][11][12] . In particular, electronic skin (e-skin) has gradually attracted attention [13][14][15][16][17][18] , since it has outstanding flexibility [6,[19][20][21] , enabling it to fit the complex surface of the human body and various detection capabilities [22,23] , such as piezoelectric [24,25] , piezoresistive [26][27][28][29] and photoelectric sensors. Although e-skin has promising development prospects, it is still plagued by problems, such as the instability caused by the peeling-transferring preparation process [30,31] .…”

Section: Introductionmentioning

confidence: 99%

Direct fabrication of high-performance multi-response e-skin based on a graphene nanosheet film

Zhang¹,

Li²,

Wang³

et al. 2022

Soft Sci

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With the increasing popularity of wearable devices, lightweight electronic skin (e-skin) has attracted significant attention. However, current fabrication technologies make it difficult to directly fabricate sensing materials on flexible substrates at low temperatures. Hence, we propose a flexible graphene nanosheet-embedded carbon (F-GNEC) film, which is directly grown on a flexible substrate using an electron cyclotron resonance low-temperature sputtering system. The direct batch manufacturing of e-skin is obtained by the unique plasma generation mode of electron cyclotron resonance and the polariton energy transfer mode between the plasma and substrate surface. The F-GNEC film contains a large number of graphene nanosheets grown vertically and the graphene edges can serve as electron capture centers, thereby enabling the multi-response properties. We achieve a high gauge factor of 14,699 under a tensile strain of ε = 0.5% and the changing rate of the resistance reaches to 113.2% when the e-skin is bent to 120°. Furthermore, the e-skin achieves a photocurrent of 1.2 μA under 532 nm laser illumination. The F-GNEC film exhibits a sensitive temperature response and achieves a coefficient of -0.58%/°C in a wide temperature range (30-100 °C). The directly fabricated F-GNEC film-based e-skin is stable and firm and exhibits multi-response detection capabilities, which enable its potential application in virtual reality technology and flexible robots.

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