Size dependent electrochemical properties of reduced graphite oxide

Tran, Minh-Hai; Yang, Cheol‐Soo; Yang, Sunhye; Kim, Ick‐Jun; Jeong, Hae Kyung

doi:10.1016/j.cplett.2014.05.075

Cited by 7 publications

(6 citation statements)

References 16 publications

(18 reference statements)

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“…The extremely poor performance of PPMOF-Ar-900 may be related to the formation of partial graphite oxide phase, as suggested by its XRD pattern, which gives rise to poor conductivity in the material. 49 Thus, it is evident that the material pyrolyzed at 800 °C possesses a superior capacitance value over the materials obtained either at a higher or lower temperature. Presence of nitrogen, high surface area, and distinct morphological features in PPMOF-Ar-800 are responsible for introducing supercapacitance properties in the material through a redox process, whereas PPMOF-Ar-700 shows a moderate specific capacitance value in spite of having quite a low surface area due to its relatively higher nitrogen content.…”

Section: ■ Results and Discussionmentioning

confidence: 96%

“…The cyclic voltammograms of PPMOF-Ar-700 and PPMOF-Ar-900 in 1 M H 2 SO 4 (Supporting Information, Figures S2 and S3, respectively) are almost similar in pattern with that of PPMOF-Ar-800 , but their specific capacitance values at scan rate of 5 mV·s –1 are 312 and 33 F·g –1 , respectively. The extremely poor performance of PPMOF-Ar-900 may be related to the formation of partial graphite oxide phase, as suggested by its XRD pattern, which gives rise to poor conductivity in the material . Thus, it is evident that the material pyrolyzed at 800 °C possesses a superior capacitance value over the materials obtained either at a higher or lower temperature.…”

Section: Resultsmentioning

confidence: 99%

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Evolution of an Electrochemically Inactive Metal–Organic Framework to Reticulated Porous Carbon Particles with High Supercapacitance

Pal

Das

et al. 2023

Energy Fuels

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An iron-containing porphyrin-based porous metal− organic framework (PPMOF) has been synthesized and subsequently pyrolyzed to obtain the carbon structure with homogeneous distribution of nitrogen. The pyrolysis is carried out at different temperatures and in the presence of two different environments; in argon to obtain PPMOF-Ar-700, PPMOF-Ar-800, and PPMOF-Ar-900, and in nitrogen to obtain PPMOF-N-800. The motivation here is to study the change in the electrochemical properties that take place on conversion of the metal−organic framework to its corresponding carbons. The materials have been characterized by powder X-ray diffraction, nitrogen adsorption/desorption, scanning electron microscopy, Xray photoelectron spectroscopy, and Raman spectroscopy, among others. It was observed that PPMOF almost did not show any electrochemical response and was unstable, whereas the carbonized frameworks showed good supercapacitive behavior and stability. The surface area increases from 353 to 838 m 2 •g −1 , when the pyrolysis gas is switched over from nitrogen to argon. It also results in the formation of uniform smooth spherical particles in PPMOF-Ar-800, in contrast to agglomerated broken particles in PPMOF-N-800. PPMOF-Ar-800 shows a remarkable specific capacitance value of 500 F•g −1 at a current density of 1 A•g −1 which is retained at a high value of 111 F•g −1 at a very high current density of 50 A•g −1 in galvanostatic charge/discharge studies, whereas for PPMOF-N-800, the specific capacitance is 400 F•g −1 at 1 A•g −1 and its discharge time is also shorter than that for PPMOF-Ar-800. This indicates that the pyrolysis environment plays a crucial role in the formation and stabilization of the carbon structures.

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Section: ■ Results and Discussionmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Evolution of an Electrochemically Inactive Metal–Organic Framework to Reticulated Porous Carbon Particles with High Supercapacitance

Pal

Das

et al. 2023

Energy Fuels

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“…XPS survey spectra in Figure b reveal that the prepared membrane consists of carbon, nitrogen, sulfur, and oxygen, and the lithium salt was fully removed by the repeated boiling process because of a lack of signal at 55 eV . N 1s XPS spectra in Figure c show that the nitrogen atoms are mainly involved in the aromatic ring structures such as pyridine (398.6 eV) and pyridone (and/or pyrrole, 399.9 eV) structures, whereas the portions of the oxidized nitrogen (405.2 eV) or the nitrogen atoms placed at the graphitic (or quaternary) position (400.6 eV) are not significant. , S 2p XPS spectra in Figure d exhibited four peaks: a peak at 161.6 eV attributed to sulfide (S 2– ) from thioketone (CS), two peaks at 163.5 and 164.7 eV related to 2p 3/2 and 2p 1/2 positions of the −C–S– covalent bond, and a broad peak at 167.8 eV that originated from −SO 3 – . In brief, the molecular structure of the PAN-S membrane was built with cross-linked PAN functionalized with the sulfonate group, as shown in Figure c.…”

Section: Resultsmentioning

confidence: 99%

Dendrite Suppression Membranes for Rechargeable Zinc Batteries

Lee

Cui

Xing

et al. 2018

ACS Appl. Mater. Interfaces

200

145

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Aqueous batteries with zinc metal anodes are promising alternatives to Li-ion batteries for grid storage because of their abundance and benefits in cost, safety, and nontoxicity. However, short cyclability due to zinc dendrite growth remains a major obstacle. Here, we report a cross-linked polyacrylonitrile (PAN)-based cation exchange membrane that is low cost and mechanically robust. Li 2 S 3 reacts with PAN, simultaneously leading to cross-linking and formation of sulfur-containing functional groups. Hydrolysis of the membrane results in the formation of a membrane that achieves preferred cation transport and homogeneous ionic flux distribution. The separator is thin (30 μm-thick), almost 9 times stronger than hydrated Nafion, and made of low-cost materials. The membrane separator enables exceptionally long cyclability (>350 cycles) of Zn/Zn symmetric cells with low polarization and effective dendrite suppression. Our work demonstrates that the design of new separators is a fruitful pathway to enhancing the cyclability of aqueous batteries.

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“…These sheets can be easily surface modified [4] or functionalized through covalent grafting [5][6]. Once GtO is exfoliated, it can be converted into reduced graphene oxide (rGO) [7] by a variety of methods, such as: a) chemical by employing reducing agents like hydrazine hydrate [8][9][10], NaBH 4 [11][12], urea [13], hydroxylamine [14], pyrrole [15], etc., b) microwaves [16][17][18][19], c) thermal annealing [20][21][22][23][24][25] and d) hydrothermal processing [26][27][28][29][30][31]. rGO has attracted intensive attention mainly because it can be cheaply produced on a large scale from GtO.…”

Section: Introductionmentioning

confidence: 99%