Ultra-long cycle life and binder-free manganese-cobalt oxide supercapacitor electrodes through photonic nanostructuring

Gaire, Madhu; Subedi, Binod; Adireddy, Shiva; Chrisey, Douglas B.

doi:10.1039/d0ra08510c

Cited by 37 publications

(9 citation statements)

References 69 publications

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“…However, the MnO 2 /graphite electrode showed poor rate capability. Overall, the 5 min electrode delivered higher capacitance with better rate capability than the 3 min electrode and is also comparable to and higher than the previous reports, including MnO 2 nanosheets@bamboo leaf carbon (76 F g −1 at 0.5 A g −1 in 1 M Na 2 SO 4 ), 59 tungsten nitride thin films ((163 F g −1 at 0.5 mA cm −2 in 1 M H 2 SO 4 ), 60 δ-MnO 2 (190 F g −1 at 0.25 A g −1 in 1 M Na 2 SO 4 ), 61 birnessite-type MnO 2 / carbon composite (114 F g −1 at 2 A g −1 in 2.5 M KNO 3 ), 62 MnO 2 /PIn nanocomposite (155 F g −1 at 1 A g −1 in 1 M KCl), 63 manganese nitride (118 mF cm −2 for KOH, 68 mF cm −2 for KCl and 27 mF cm −2 for Na 2 SO 4 at a scan rate of 10 mV/s), 64 manganese-cobalt oxide (11 and 9 mF cm −2 at 0.40 mA cm −2 in 1 M KOH), 65 MnO 2 −CuO−BaO (198 F g −1 at 10 mV s −1 in 1 M KOH), 66 NiO/MnO 2 /CNT (23 F g −1 at 0.1 A g −1 in 1 M KOH), 55 and MnO 2 particles on the surface of hollow porous carbon nanospheres (198 F g −1 at 1 A g −1 in 1 M Na 2 SO 4 ). 67 To evaluate the resistance at the electrode/electrolyte interface of the electroactive material, an EIS measurement was performed.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Flexible, Lightweight, and Ultrabendable RuO₂–MnO₂/Graphite Sheets for Supercapacitors

et al. 2022

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In the present work, we have introduced lightweight, ultrabendable, rough graphite sheets on a polyimide tape substrate as a current collector. The flexible current collector was fabricated by the peel-off method. The as-prepared graphite-sheetcoated polyimide substrate is ultraflexible (bendable, rollable, and twistable), thin, and lightweight, has better conductivity, high mechanical durability, and ease of fabrication, and is cost-effective, rough, and environment friendly. The fabricated flexible current collector could be directly used as the substrate for constructing RuO 2 −MnO 2 /graphite flexible supercapacitors. The as-prepared electrode delivered a maximum gravimetric capacitance of 183 F g −1 (73.5 mF cm −2 ) at a current density of 1 A g −1 with better rate capability and 96% capacitance retention (after 5000 cycles). The better electrochemical performance of the electrode is due to the rough surface and good electrical conductivity of the current collector leads to the better attachment of active material and rapid ions/electron transfer.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Flexible, Lightweight, and Ultrabendable RuO₂–MnO₂/Graphite Sheets for Supercapacitors

et al. 2022

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“…Finally, we get a sintered and conductive thin-film electrode. Our past reports [18][19][20] describe the photonic processing mechanism in detail.…”

Section: Resultsmentioning

confidence: 99%

“…Normally, a typical Nyquist plot contains a semicircle in the high-frequency region and a vertically rising line in the lowfrequency region. From the high-frequency region of the plot, the intercept on the real axis gives the series resistance (R s ) of the electrode while the diameter of the semicircle gives the charge transfer resistance (R ct ) [18][19][20]49]. The presence of a vertically rising line in the low-frequency region is associated with electrolyte ion diffusion to the active material.…”

Section: Resultsmentioning

confidence: 99%

Flexible iron oxide supercapacitor electrodes by photonic processing

Gaire

Khatoon

Subedi

et al. 2021

Journal of Materials Research

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We report the preparation of flexible and nano-porous iron oxide-reduced graphitic oxide (Fe2O3–rGO) electrodes using a novel photonic processing method. Due to this unique technique, high-temperature thermal processing could be accomplished on inexpensive and low-temperature substrates instantaneously as opposed to longer processing times of conventional thermal processing. The nano-porous morphology of the electrode not only accommodates the volume changes of the electrode but also facilitates the transport of the electrolyte ions into the electrodes. The as-prepared electrode showed excellent electrochemical performance with an initial specific capacitance of 179 F/g at 2 A/g. Moreover, it exhibited excellent specific capacitance retention after 5000 cycles (70%), revealing its superior cyclic stability. Along with having specific capacitance comparable to that of rigid electrodes, the as-prepared electrode is bendable and lightweight, signifying its potential application in foldable and wearable consumer electronic devices which require continuous energy supply while going through physical deformation. Graphic abstract

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“…The precursor solution was prepared by dissolving 0.5 g organometallic precursor powder Co (III) acetylacetonate (98.5%, Sigma-Aldrich, St. Louis, MO, USA) in 20 mL acetone (99.5%, Sigma-Aldrich, St. Louis, MO, USA) and placed in an ultrasonication system for 20 min. Thin-film deposition was accomplished by spray-coating, which we reported in our past work [ 16 , 17 ], the precursor solution on 1 cm × 1 cm Pt-coated silicon wafer (University Wafer, Boston, MA, USA) using an air-spray (Paasche Airbrush, Chicago, IL, USA) in ambient conditions. To ensure uniformity of the films, parameters such as the gas flow, precursor solution concentration, distance between the tip of the spray nozzle and the substrate, etc.…”

Section: Methodsmentioning

confidence: 99%

Preparation of Cobalt Oxide–Reduced Graphitic Oxide Supercapacitor Electrode by Photothermal Processing

2021

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We report a photonic technique to instantaneously synthesize cobalt oxide reduced graphitic oxide (CoOx-rGO) supercapacitor electrodes. The electrode processing is achieved through rapidly heating the precursor material by irradiation of high-energy pulsed mostly visible light from a xenon lamp. Due to the short duration of the light pulse, we prepared the electrodes at room temperature instantaneously (ms), thus eliminating the several hours of processing times of the conventional techniques. The as-prepared electrodes exhibited a highly porous morphology, allowing for enhanced ionic transport during electrochemical interactions. The electrochemical properties of the CoOx-rGO electrodes were studied in 1 M KOH aqueous electrolyte. The non-rectangular cyclic voltammetry (CV) curves with characteristic redox peaks indicated the pseudocapacitive charge storage mechanism of the electrodes. From the discharge curves at 0.4 mA/cm2 and 1.6 A/g constant current densities, the electrode showed areal specific capacitance of 17 mF/cm2 and specific capacitance of 69 F/g, respectively. Cyclic stability was tested by performing 30,000 galvanostatic charge–discharge (GCD) cycles and the electrode exhibited 65% capacitance retention, showing its excellent electrochemical performance and ultra-long cycle life. The excellent electrochemical electrode properties are attributed to the unique processing technique, optimum processing parameters, improved conductivity due to the presence of rGO, and highly porous morphology which offers a high specific surface area. The novel photonic processing we report allows for high-temperature heating of the precursor films achieved via non-radiative recombination of photogenerated electron holes pairs during irradiation. Such extremely quick (ms) heating followed by instantaneous cooling results in the formation of a dense and robust bottom layer of the electrode, resulting in a long cycle life.

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Ultra-long cycle life and binder-free manganese-cobalt oxide supercapacitor electrodes through photonic nanostructuring

Abstract: We report a novel photonic processing technique as a next-generation cost-effective method to instantaneously synthesize nanostructured manganese-cobalt mixed oxide reduced graphitic oxide (Mn-Co-rGO) as supercapacitor electrodes for energy storage.

Cited by 37 publications

References 69 publications

Flexible, Lightweight, and Ultrabendable RuO₂–MnO₂/Graphite Sheets for Supercapacitors

Flexible, Lightweight, and Ultrabendable RuO₂–MnO₂/Graphite Sheets for Supercapacitors

Flexible iron oxide supercapacitor electrodes by photonic processing

Preparation of Cobalt Oxide–Reduced Graphitic Oxide Supercapacitor Electrode by Photothermal Processing

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Ultra-long cycle life and binder-free manganese-cobalt oxide supercapacitor electrodes through photonic nanostructuring

Abstract: We report a novel photonic processing technique as a next-generation cost-effective method to instantaneously synthesize nanostructured manganese-cobalt mixed oxide reduced graphitic oxide (Mn-Co-rGO) as supercapacitor electrodes for energy storage.

Cited by 37 publications

References 69 publications

Flexible, Lightweight, and Ultrabendable RuO2–MnO2/Graphite Sheets for Supercapacitors

Flexible, Lightweight, and Ultrabendable RuO2–MnO2/Graphite Sheets for Supercapacitors

Flexible iron oxide supercapacitor electrodes by photonic processing

Preparation of Cobalt Oxide–Reduced Graphitic Oxide Supercapacitor Electrode by Photothermal Processing

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Product

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Flexible, Lightweight, and Ultrabendable RuO₂–MnO₂/Graphite Sheets for Supercapacitors

Flexible, Lightweight, and Ultrabendable RuO₂–MnO₂/Graphite Sheets for Supercapacitors