A Comparison Study of Furnace and Atmospheric-Pressure-Plasma Jet Calcined Pt-Decorated Reduced Graphene Oxides for Dye-Sensitized Solar Cell Application

Wan, Ting-Hao; Lee, Chia-Chun; Chen, Chieh-Wen; Hsu, Cheng–Che; Cheng, I-Chun; Chen, Jian-Zhang

doi:10.1149/2.1511713jes

Cited by 9 publications

(5 citation statements)

References 52 publications

(72 reference statements)

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“…The exposure of rGOs can have better contact with the gel-electrolyte, thereby increasing the capacitance value as described latter. APPJ treatment for an overly long duration may completely burn out the rGOs [21,24]. Therefore, in this study, the APPJ processing time is limited to 20 s. Abundant rGOs are still present after APPJ processing at all temperatures.…”

Section: Resultsmentioning

confidence: 99%

Flexible reduced graphene oxide supercapacitors processed using atmospheric-pressure plasma jet under various temperatures adjusted by flow rate and jet-substrate distance

Fan

Chien

Hsu

et al. 2019

Mater. Res. Express

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We vary the substrate temperature by adjusting the nitrogen flow rate and jet-substrate distance during nitrogen atmospheric-pressure plasma jet (APPJ) processing of screen-printed reduced graphene oxides (rGOs) on carbon cloth. The APPJ-processed rGOs on carbon cloth are then used as electrodes for supercapacitors. Increasing the nitrogen flow rate could reduce the gas temperature and enhance the reactivity of the reactive plasma species. Typically, lowering the temperature slows down the chemical reaction; however, increased reactivity of the reactive plasma species at the same jetsubstrate distance could compensate the temperature effect. A nitrogen APPJ could improve the wettability of the screen-printed rGOs on carbon cloth. We found that 20-s APPJ treatment increases the areal capacitance from 6.2 mF cm −2 (without APPJ treatment) to 22.4 mF cm −2 (700°C, 30 slm), as evaluated by galvanostatic charging/discharging (GCD) measurements under a constant current of 0.25 mA. Further, 20-s nitrogen APPJ processing at temperatures of ∼600°C-700°C could obtain the best areal capacitance value. The capacitance value of the fabricated flexible rGO supercapacitor remains at similar level after 1000-cycle mechanical bending test with a bending radius of 5 mm.

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Section: Resultsmentioning

confidence: 99%

Flexible reduced graphene oxide supercapacitors processed using atmospheric-pressure plasma jet under various temperatures adjusted by flow rate and jet-substrate distance

Fan

Chien

Hsu

et al. 2019

Mater. Res. Express

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“…Nitrogen doping in carbonaceous materials is considered to benefit the supercapacitor performance [55]. Our APPJ processes can create holes on rGOs [12,18,19,21,22,56]. Nitrogen-doped rGOs with holes have been demonstrated enhanced supercapacitor performance [53,57].…”

Section: Characterization Of Rgo-coated Carboncloth and Supercapacitorsmentioning

confidence: 99%

Scan-Mode Atmospheric-Pressure Plasma Jet Processed Reduced Graphene Oxides for Quasi-Solid-State Gel-Electrolyte Supercapacitors

et al. 2018

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A scanning atmospheric-pressure plasma jet (APPJ) is essential for high-throughput large-area and roll-to-roll processes. In this study, we evaluate scan-mode APPJ for processing reduced graphene oxides (rGOs) that are used as the electrodes of quasi-solid-state gel-electrolyte supercapacitors. rGO nanoflakes are mixed with ethyl cellulose (EC) and terpineol to form pastes for screen-printing. After screen-printing the pastes on carbon cloth, a DC-pulse nitrogen APPJ is used to process the pastes in the scan mode. The maximal temperature attained is~550 • C with a thermal influence duration of 10 s per scan. The pastes are scanned by APPJ for 0, 1, 3 and 5 times. X-ray photoelectron spectroscopy (XPS) indicates the reduction of CO binding content as the number of scan increases, suggesting the oxidation/decomposition of EC. The areal capacitance increases and then decreases as the number of scan increases; the best achieved areal capacitance is 15.93 mF/cm 2 with one APPJ scan, in comparison to 4.38 mF/cm 2 without APPJ processing. The capacitance retention rate of the supercapacitor with the best performance is~93% after a 1000-cycle cyclic voltammetry (CV) test. The optimal number of APPJ scans should enable the proper removal of inactive EC and improved wettability while minimizing the damage caused to rGOs by nitrogen APPJ processing.

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“…The introduced heteroatoms provide active sites not only for repelling polysulfides [56] but also for transferring lithium ions [50]. However, the syntheses of rGO from graphene oxide (GO) usually involve a hydrothermal reaction [45], calcining [57] and chemical reduction [58]. These methods are complicated and therefore simpler methods need to be developed for the application of rGO in practice.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing N,O-carboxymethyl chitosan-reduced graphene oxide under freeze-dying for performance improvement of Li-S battery

Jin

Jian

et al. 2022

Int. J. Extrem. Manuf.

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Lithium-sulfur (Li-S) battery can provide far higher energy density than currently commercialized lithium ion battery, but challenges remain before it is used in practice. One of challenges is the shuttle effect that is originated from soluble intermediates, lithium polysulfides. To address this issue, we report a novel laminar composite, N,O-carboxymethyl chitosan-reduced graphene oxide (CC-rGO), which is manufactured via the self-assembly of CC onto GO and subsequent reduction of GO under an extreme condition of 1 Pa and -50 ℃. The synthesized laminar CC-rGO composite is mixed with acetylene black (AB) and coated on a commercial polypropylene (PP) membrane, resulting in a separator (CC-rGO/AB/PP) that can completely suppress the polysulfides penetration but accelerate the lithium ion transportation, providing Li-S battery with excellent cyclic stability and rate capability. As confirmed by theoretic simulations, this unique feature of CC-rGO is attributed to its strong repulsive interaction to polysulfide anions and its benefit for fast lithium ion transportation through the paths paved by the heteroatoms in CC.

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A Comparison Study of Furnace and Atmospheric-Pressure-Plasma Jet Calcined Pt-Decorated Reduced Graphene Oxides for Dye-Sensitized Solar Cell Application

Cited by 9 publications

References 52 publications

Flexible reduced graphene oxide supercapacitors processed using atmospheric-pressure plasma jet under various temperatures adjusted by flow rate and jet-substrate distance

Flexible reduced graphene oxide supercapacitors processed using atmospheric-pressure plasma jet under various temperatures adjusted by flow rate and jet-substrate distance

Scan-Mode Atmospheric-Pressure Plasma Jet Processed Reduced Graphene Oxides for Quasi-Solid-State Gel-Electrolyte Supercapacitors

Manufacturing N,O-carboxymethyl chitosan-reduced graphene oxide under freeze-dying for performance improvement of Li-S battery

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