Cobalt-Porphyrin Modified Three-Dimensional Graphene Hydrogel Electrode for High Performance Asymmetric Supercapacitors

Song, Yuqing; Wang, Hongfei; Yan, Lifeng

doi:10.1142/s1793292019500620

Cited by 6 publications

(2 citation statements)

References 17 publications

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“…When compared with the other three devices in Figure S9, 4M-DWIS-CHs display the most regular curve shape, the largest integrated CV area, and the longest discharge time, reflecting a rapid I-V response and superior capacitive properties. [29] Specifically, the comparison of the specific capacitances was presented in Figure S10, showing that the 4M-DWIS-CHs-based supercapacitor achieves the largest values of 107.6, 98.1, 87.3, 68.8, and 60.9 F g À 1 at the current densities of 1, 2, 4, 8, and 10 A g À 1 , respectively. Moreover, 56.6 % of the initial capacitance is retained at 10 A g À 1 relatively to 1 A g À 1 , superior to the other samples, 5M-DWIS-CHs (39.1 %), 6M-DWIS-CHs (34.0 %), and 7M-DWIS-CHs (24.8 %), suggesting remarkable rate capabilities.…”

Section: Resultsmentioning

confidence: 99%

In Situ Formation of “Dimethyl Sulfoxide/Water‐in‐Salt”‐Based Chitosan Hydrogel Electrolyte for Advanced All‐Solid‐State Supercapacitors

et al. 2020

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Biodegradable hydrogel electrolytes are particularly attractive in the fabrication of all‐solid‐state supercapacitors due to environmental benignity and avoiding of leakage. The introduction of “water‐in‐salt” (WIS) electrolytes into hydrogels will further broaden the electrochemical stability window of aqueous supercapacitors significantly. Meanwhile, the addition of an organic co‐solvent can effectively overcome the inevitable salt precipitation and extend the temperature adaptability. Herein, an in situ cross‐linking approach was demonstrated without any extra binder to obtain a “dimethyl sulfoxide/water‐in‐salt”‐based (DWIS) chitosan hydrogel electrolyte. Interestingly, the addition of 4–7 mol L−1 of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salts not only conforms to the criterion of WIS, but also promoted the successful gelation through the supramolecular complexation between Li+‐solvated complexes and chitosan chains. A hydrogel‐based all‐solid‐state supercapacitor was fabricated using the DWIS chitosan hydrogel as the electrolyte and separator while nitrogen‐doped graphene hydrogel (NG) was used as the electrode. The optimized supercapacitor with a wide operating voltage of 2.1 V showed a high specific capacitance of 107.6 F g−1 at 1 A g−1, remarkable capacitance retention of 80.1 % after 5000 cycles, a superior energy density of 62.9 Wh kg−1 at a power density of 1025.5 W kg−1, and excellent temperature stability in the range of −20 to 70 °C. These findings suggest that the as‐prepared hydrogel electrolyte holds great potential in the practical application of high‐performance solid‐state energy storage devices.

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Section: Resultsmentioning

confidence: 99%

In Situ Formation of “Dimethyl Sulfoxide/Water‐in‐Salt”‐Based Chitosan Hydrogel Electrolyte for Advanced All‐Solid‐State Supercapacitors

et al. 2020

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“…Among a diversity of MOFs, ultrathin 2D metal‐porphyrin framework (MPF) nanosheets have drawn extensive attention as electrode materials for SCs due to their π‐conjugated skeletons, large surface areas, inherent porosities and abundant accessible active sites 71,92,116,131,132,179‐181,187‐194 . Moreover, porphyrins generally present small HOMO‐LUMO gaps that enable the facile uptake and release of electrons, thus leading to fast redox kinetics 195 .…”

Section: Monometallic Metal‐organic Compounds and Their Compositesmentioning

confidence: 99%

Supercapacitor electrodes based on metal‐organic compounds from the first transition metal series

Chen

Xie

et al. 2021

EcoMat

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Metal‐organic compounds, including molecular complexes and coordination polymers, have attracted much attention as electrode materials in supercapacitors owing to their large surface area, high porosity, tailorable pore size, controllable structure, good electrochemical reversibility, and abundant active sites. Among the variety of metal‐organic compounds exhibiting desired supercapacitor performances (high specific capacitance, long cycling life, high energy density, and power density), those with metals in the first transition metal series are the most studied due to their rich covalent states, light atom weight, environmental‐friendliness, non‐toxicity, and low cost. In this review, the recent reports on the metal‐organic compounds of the first transition metal series as electrode materials in supercapacitors are summarized and their electrode and device performances are discussed in terms of different metal elements and typical multidentate ligands. Moreover, the current challenges, design strategies, future opportunities and further research directions are also highlighted for metal‐organic compounds in the field of supercapacitors.

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Biologically-mediated synthesis of silver‑zinc oxide incorporated with graphene aerogel: Energy storage applications, photodegradation of dyes, and oil-organic solvents adsorption

Hieu,

Buu,

Khue

et al. 2024

Diamond and Related Materials

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Cobalt-Porphyrin Modified Three-Dimensional Graphene Hydrogel Electrode for High Performance Asymmetric Supercapacitors

Cited by 6 publications

References 17 publications

In Situ Formation of “Dimethyl Sulfoxide/Water‐in‐Salt”‐Based Chitosan Hydrogel Electrolyte for Advanced All‐Solid‐State Supercapacitors

In Situ Formation of “Dimethyl Sulfoxide/Water‐in‐Salt”‐Based Chitosan Hydrogel Electrolyte for Advanced All‐Solid‐State Supercapacitors

Supercapacitor electrodes based on metal‐organic compounds from the first transition metal series

Biologically-mediated synthesis of silver‑zinc oxide incorporated with graphene aerogel: Energy storage applications, photodegradation of dyes, and oil-organic solvents adsorption

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